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Found 36 entries in the Bibliography.
Showing entries from 1 through 36
| 2022 |
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Low-latitude plasma blobs above Africa: Exploiting GOLD and multi-satellite in situ measurements Low-latitude plasma blobs are localized density enhancements of electron density that are occasionally observed in the night-time tropical ionosphere. Two-dimensional (2D) imaging of this phenomenon has been rare and frequently restricted to Central/South America, which is densely covered with ground-based airglow imagers and Global Navigation Satellite System (GNSS) receivers. In Africa, on the contrary, no 2D image of a blob has been reported. Here we present two low-latitude blob events above Africa, one in the Northern summer and the other in winter, in the 2-dimensional Far-UltraViolet (FUV) images from the Global-scale Observations of the Limb and Disk (GOLD) mission. Additionally, multiple satellites (four spacecraft per event) on the Low-Earth-Orbit (LEO) encountered the blob events, some within the GOLD images and some outside. The LEO data support the robustness of GOLD observations and bridge time gaps between the consecutive images. Properties of the two blob events above Africa generally support the conclusions in a previous case study for Central/South America. Plasma therein exhibited higher O+ fraction and faster ion flow toward outer L-shells than the ambient. The blobs were conjugate to locally intensified Equatorial Ionization Anomaly crests without conspicuous equatorward-westward propagation. Our results demonstrate the usefulness of GOLD and multiple LEO satellites in monitoring the ionosphere above Africa, which is a fascinating laboratory of low-latitude electrodynamics but still waiting for more observatories to be deployed. Park, Jaeheung; Min, Kyoung; Eastes, Richard; Chao, Chi; Kim, Hee-Eun; Lee, Junchan; Sohn, Jongdae; Ryu, Kwangsun; Seo, Hoonkyu; Yoo, Ji-Hyeon; Lee, Seunguk; Woo, Changho; Kim, Eo-Jin; Published by: Advances in Space Research Published on: may YEAR: 2022 DOI: 10.1016/j.asr.2022.05.021 |
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Neutral composition information in ICON EUV dayglow observations Since the earliest space‐based observations of Earth s atmosphere, ultraviolet (UV) airglow has proven a useful resource for remote sensing of the ionosphere and thermosphere. The Tuminello, Richard; England, Scott; Sirk, Martin; Meier, Robert; Stephan, Andrew; Korpela, Eric; Immel, Thomas; Mende, Stephen; Frey, Harald; Published by: Journal of Geophysical Research: Space Physics Published on: YEAR: 2022 DOI: 10.1029/2022JA030592 |
| 2021 |
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Model of the E-Layer Critical Frequency for the Auroral Region A new foE model for the auroral region is constructed; the model is based on an analysis of the models of auroral electron precipitations, the boundaries of the discrete and diffusive aurora, the main ionospheric trough, and measurements of the E-layer critical frequency foE. The model is an analytical model. It consists of solar (foEsol) and auroral (foEavr) components. The solar component of the model does not depend of geomagnetic activity. It depends on solar activity via the F index, which is determined by the solar radio emission flux at a wavelength of 10.7 cm over the previous day and three solar rotations. The auroral component of the model does not depend of solar activity. It depends on geomagnetic activity via the effective Kp* index, which takes into account the prehistory of changes in this activity. The model indirectly takes into account the dependence of the relative contribution of foEsol and foEavr to the total foE value on the difference in the heights of the maxima of these model components via the addition of a coefficient. The model qualitatively takes into account the effect of the winter anomaly in foEavr via the addition of a function. It is found that the errors of the new foE model in the auroral region at the nighttime hours are much lower than those in the international IRI model (with the STORM-E option) for both moderate and high geomagnetic activity. For example, the comparison with data from ionospheric stations shows that the IRI model underestimates foE in these conditions by approximately a factor of 2 on average. The average shift in foE relative to the experimental data in the new model does not exceed 20\%. Deminov, M.; Shubin, V.; Badin, V.; Published by: Geomagnetism and Aeronomy Published on: sep YEAR: 2021 DOI: 10.1134/S0016793221050054 |
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A method for retrieving temperature and composition from 150 to 350 km in Earth s thermosphere using total number density measurements made via extreme ultraviolet (EUV) solar occultations by the Project for OnBoard Autonomy 2/Large Yield Radiometer (PROBA2/LYRA) instrument is presented. Systematic and random uncertainties are calculated and found to be less than 5\% for the temperature measurements and 5\%–20\% for the composition measurements. Regression coefficients relating both temperature and the [O]/[N2] abundance ratio with EUV irradiance at 150, 275, and 350 km are reported. Additionally, it is shown that the altitude where [O] equals [N2] decreases with increasing solar EUV irradiance, an effect attributed to thermal expansion. Temperatures from 2010 to 2017 are compared with estimates from the MSIS empirical model and show good agreement at the dawn terminator but LYRA is markedly cooler at the dusk terminator, with the MSIS-LYRA temperature difference increasing with solar activity. Anthropogenic cooling can explain this discrepancy at periods of lower solar activity, but the divergence of temperature with increasing solar activity remains unexplained. LYRA measurements of the exospheric temperature sensitivity to EUV irradiance are compared with contemporaneous measurements made at Mars, showing that the exospheric temperature at Mars is approximately half as sensitive to EUV variability as that of Earth. Thiemann, Edward; Dominique, Marie; Published by: Journal of Geophysical Research: Space Physics Published on: YEAR: 2021 DOI: 10.1029/2021JA029262 comparative planetology; EUV; occultations; space weather; thermosphere |
| 2020 |
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We simulated the impact of long‐term changes in the geomagnetic field on the spatial pattern of the Weddell Sea Anomaly (WSA). The Weddell Sea Anomaly, belonging to the region Slominska, Ewa; Strumik, Marek; Slominski, Jan; Haagmans, Roger; Floberghagen, Rune; Published by: Journal of Geophysical Research: Space Physics Published on: YEAR: 2020 DOI: 10.1029/2019JA027528 |
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We simulated the impact of long‐term changes in the geomagnetic field on the spatial pattern of the Weddell Sea Anomaly (WSA). The Weddell Sea Anomaly, belonging to the region Slominska, Ewa; Strumik, Marek; Slominski, Jan; Haagmans, Roger; Floberghagen, Rune; Published by: Journal of Geophysical Research: Space Physics Published on: YEAR: 2020 DOI: 10.1029/2019JA027528 |
| 2017 |
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A new data set of summed neutral N2 and O number density profiles, spanning altitudes between 150 and 400\ km, and observed during Northern Winter from 2010 to 2016 is presented. The neutral density profiles are derived from solar occultation measurements made by the 0.1\textendash20\ nm Zr channel on the Large Yield Radiometer (LYRA) instrument on board Project for Onboard Autonomy 2 (PROBA2). The climatology derived from the vertical profiles is consistent with that predicted by the NRLMSISE-00 model, and the systematic error and random uncertainty of the measurements are less than 13\% and 6\%, respectively. The density profiles are used to characterize the response of thermospheric density to solar EUV irradiance variability. Peak correlation coefficients between neutral density and EUV irradiance occur near 300\ km at the dusk terminator and 220\ km at the dawn terminator. Density variability is higher at dawn than it is at dusk, and temperature variability increases with increasing altitude at both terminators. Thiemann, E.; Dominique, M.; Pilinski, M.; Eparvier, F.; Published by: Space Weather Published on: 12/2017 YEAR: 2017 DOI: 10.1002/2017SW001719 |
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Winter anomaly of the E-layer critical frequency in the nighttime auroral zone Analysis of the annual variation of the E-layer critical frequency median foE in the nighttime (22-02 LT) auroral zone by the data of several stations of the Northern Hemisphere has shown the median maximum in winter and minimum in summer, even though the summer contribution of solar radiation to foE is greater. Thus, a new phenomenon was discovered\textemdashan foE median winter anomaly in the nighttime auroral zone. Its amplitude (ratio of winter to summer foE figures) can reach 10\textendash15\%; however, this anomaly was weakly expressed and statistically insignificant at particular stations located in the auroral zone. The winter anomaly is more distinct for foE avr, the median of the E-layer critical frequency foE caused by the auroral source of atmospheric ionization, i.e., excluding the solar radiation contribution to foE. For foE avr, the amplitude of the winter anomaly can reach 15\textendash20\%. Based on the qualitative analysis, it has been found that foE winter anomaly is stipulated by the winter/summer asymmetry of energy flow of accelerated electrons, which induce discrete aurorae in the nighttime auroral zone. Published by: Geomagnetism and Aeronomy Published on: 10/2017 YEAR: 2017 DOI: 10.1134/S0016793217050061 |
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Winter anomaly of the E-layer critical frequency in the nighttime auroral zone Analysis of the annual variation of the E-layer critical frequency median foE in the nighttime (22-02 LT) auroral zone by the data of several stations of the Northern Hemisphere has shown the median maximum in winter and minimum in summer, even though the summer contribution of solar radiation to foE is greater. Thus, a new phenomenon was discovered\textemdashan foE median winter anomaly in the nighttime auroral zone. Its amplitude (ratio of winter to summer foE figures) can reach 10\textendash15\%; however, this anomaly was weakly expressed and statistically insignificant at particular stations located in the auroral zone. The winter anomaly is more distinct for foE avr, the median of the E-layer critical frequency foE caused by the auroral source of atmospheric ionization, i.e., excluding the solar radiation contribution to foE. For foE avr, the amplitude of the winter anomaly can reach 15\textendash20\%. Based on the qualitative analysis, it has been found that foE winter anomaly is stipulated by the winter/summer asymmetry of energy flow of accelerated electrons, which induce discrete aurorae in the nighttime auroral zone. Published by: Geomagnetism and Aeronomy Published on: 10/2017 YEAR: 2017 DOI: 10.1134/S0016793217050061 |
| 2016 |
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Wave Interaction with Land, Water and Air Much of the matter presented in the previous parts of this book aims at providing a unified rationale within which the interaction of the electromagnetic waves with natural and man-made Published by: Published on: YEAR: 2016 DOI: 10.1007/978-3-319-25633-7_14 |
| 2014 |
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Seasonal trends of nighttime plasma density enhancements in the topside ionosphere In situ registrations of electron density from the Langmuir probe on board Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions satellite are used to study spatial and temporal evolution of nighttime plasma density enhancements (NPDEs). The study introduces the normalized density difference index INDD in order to provide global estimates of the phenomenon. In the validation test, in situ data are compared with synthetic data set generated with the International Reference Ionosphere model. We find signatures of two most common examples of NPDEs, the Weddell Sea Anomaly (WSA) and midlatitude nighttime summer anomaly (MSNA) with proposed index, in the topside ionosphere. The study provides evidence that the occurrence of the WSA and MSNA is not limited to the local summer conditions. Analyzed annual trend of INDD and in particular spatial pattern obtained during equinoxes suggest that mechanisms governing the behavior of the equatorial ionosphere cannot be neglected in the explanation of the development of NPDEs. Slominska, Ewa; Blecki, Jan; Lebreton, Jean-Pierre; Parrot, Michel; Slominski, Jan; Published by: Journal of Geophysical Research: Space Physics Published on: 08/2014 YEAR: 2014 DOI: 10.1002/2014JA020181 Electron density; Ionosphere; Langmuir probe; Weddell Sea Anomaly |
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Seasonal trends of nighttime plasma density enhancements in the topside ionosphere In situ registrations of electron density from the Langmuir probe on board Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions satellite are used to study spatial and temporal evolution of nighttime plasma density enhancements (NPDEs). The study introduces the normalized density difference index INDD in order to provide global estimates of the phenomenon. In the validation test, in situ data are compared with synthetic data set generated with the International Reference Ionosphere model. We find signatures of two most common examples of NPDEs, the Weddell Sea Anomaly (WSA) and midlatitude nighttime summer anomaly (MSNA) with proposed index, in the topside ionosphere. The study provides evidence that the occurrence of the WSA and MSNA is not limited to the local summer conditions. Analyzed annual trend of INDD and in particular spatial pattern obtained during equinoxes suggest that mechanisms governing the behavior of the equatorial ionosphere cannot be neglected in the explanation of the development of NPDEs. Slominska, Ewa; Blecki, Jan; Lebreton, Jean-Pierre; Parrot, Michel; Slominski, Jan; Published by: Journal of Geophysical Research: Space Physics Published on: 08/2014 YEAR: 2014 DOI: 10.1002/2014JA020181 Electron density; Ionosphere; Langmuir probe; Weddell Sea Anomaly |
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Kuzmin, AK; Merzlyi, AM; Shadrin, DG; Yu, Potanin; Banshchikova, MA; Chuvashov, IN; Published by: Published on: |
| 2012 |
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Park, Jaeheung; Lühra, Hermann; Jakowski, Norbert; Gerzen, Tatjana; Kil, Hyosub; Jee, Geonhwa; Xiong, Chao; Min, Kyoung; Noja, Max; Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on: Jan-05-2012 YEAR: 2012 DOI: 10.1016/j.jastp.2012.03.009 |
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Dayside and nightside segments of a polar arc: The particle characteristics Park, J.; Min, K.; Parks, G.; Zhang, Y.; Lee, J.-J.; Baker, J.; Kim, H.; Hwang, J.; Yumoto, K.; Uozumi, T.; Lee, C.; Published by: Journal of Geophysical Research Published on: Jan-01-2012 YEAR: 2012 DOI: 10.1029/2011JA017323 |
| 2011 |
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FUV spectrum in the polar region during slightly disturbed geomagnetic conditions Lee, C.; Min, K.; Lee, J.-J.; Hwang, J.; Park, J.; Edelstein, J.; Han, W.; Published by: Journal of Geophysical Research Published on: Jan-01-2011 YEAR: 2011 DOI: 10.1029/2011JA016898 |
| 2010 |
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Using CHAMP observations from 2002 to 2005 we investigate neutral density depletions (NDDs) associated with equatorial plasma bubbles (EPBs). The seasonal–longitudinal distribution of NDDs generally follows that of EPBs. However, there are several important differences between them. The maximum NDD occurrence rate is much smaller than the maximum EPB occurrence. NDDs occur at latitudes north and south of the dip equator with an offset of about 15∘, which is collocated with the Appleton anomaly peaks and slightly poleward of EPB occurrence maxima. The NDD occurrence maximizes around 21 LT, and has nearly died out after 23 LT. Meanwhile, the EPB occurrence shows a broad maximum between 20 and 24 LT. NDD distribution deviates slightly from that of EPBs shifted toward the region of high ion–neutral interaction. Based on our statistical results, as well as on some physics-based calculations, we suggest that an enhanced friction between ions and neutrals is needed for the NDD generation. Park, Jaeheung; Lühr, Hermann; Min, Kyoung; Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on: YEAR: 2010 DOI: https://doi.org/10.1016/j.jastp.2009.11.003 ionospheric irregularities; Equatorial ionosphere; thermospheric dynamics; ionosphere/atmosphere interactions |
| 2009 |
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Park, J.; Lühr, H.; Stolle, C.; Rother, M.; Min, K.; Michaelis, I.; Published by: Annales Geophysicae Published on: Jan-01-2009 YEAR: 2009 DOI: 10.5194/angeo-27-2685-2009 |
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Validation of Ionospheric Measurements from the International Space Station (ISS) Coffey, Victoria; Minow, Joseph; Wright, Kenneth; Published by: Published on: |
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The 27-day modulation of the low-latitude ionosphere during a solar maximum Min, Kyoung; Park, Jaeheung; Kim, Heejun; Kim, Vitaly; Kil, Hyosub; Lee, Jaejin; Rentz, Stefanie; Lühr, Hermann; Paxton, Larry; Published by: Journal of Geophysical Research: Space Physics Published on: |
| 2008 |
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Validation of the Plasma Densities and Temperatures From the ISS Floating Potential Measurement Unit The validation of the floating potential measurement unit (FPMU) plasma density and temperature measurements is an important step in the process of evaluating International Space Station (ISS) spacecraft charging issues including vehicle arcing and hazards to crew during extravehicular activities. The highest potentials observed on the Space Station are due to the combined Vsp times B effects on a large spacecraft and the collection of ionospheric electron and ion currents by the 160-V U.S. solar array modules. The ionospheric plasma environment is needed for input to the ISS spacecraft charging models used to predict the severity and frequency of occurrence of ISS charging hazards. The validation of these charging models requires the comparison of their predictions with measured FPMU values. The FPMU measurements themselves must also be validated for use in manned flight safety work. This paper presents preliminary results from a comparison of densities and temperatures derived from the FPMU Langmuir probes and plasma impedance probe with the independent density and temperature measurements from a spaceborne ultraviolet imager, a ground-based incoherent scatter radar, and ionosonde sites. Coffey, Victoria; Wright, Kenneth; Minow, Joseph; Schneider, Todd; Vaughn, Jason; Craven, Paul; Chandler, Michael; Koontz, Steven; Parker, Linda; Bui, Them; Published by: IEEE Transactions on Plasma Science Published on: Oct YEAR: 2008 DOI: 10.1109/TPS.2008.2004271 |
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Effects of solar activity variations on the low latitude topside nighttime ionosphere Park, S.M.; Kim, H.; Min, S.; Park, J.; Lee, J.H.; Kil, H.; Paxton, L.; Su, S.-Y.; Lee, J.; Min, K.W.; Published by: Advances in Space Research Published on: Jan-08-2008 YEAR: 2008 DOI: 10.1016/j.asr.2007.11.031 |
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Effects of solar activity variations on the low latitude topside nighttime ionosphere Park, S.M.; Kim, H.; Min, S.; Park, J.; Lee, J.H.; Kil, H.; Paxton, L.; Su, S.-Y.; Lee, J.; Min, K.W.; Published by: Advances in Space Research Published on: Jan-08-2008 YEAR: 2008 DOI: 10.1016/j.asr.2007.11.031 |
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In-situ observations of the Ionospheric F2-Region from the International Space Station The International Space Station orbit provides an ideal platform for in-situ studies of space weather effects on the mid and low latitude F-2 region ionosphere. The Floating Potential Measurement Unit (FPMU) operating on the ISS since Aug 2006, is a suite of plasma instruments: a Floating Potential Probe (FPP), a Plasma Impedance Probe (PIP), a Wide-sweep Langmuir Probe (WLP), and a Narrow-sweep Langmuir Probe (NLP). This instrument package provides a new opportunity for collaborative multi-instrument studies of the F-region ionosphere during both quiet and disturbed periods. This presentation first describes the operational parameters for each of the FPMU probes and shows examples of an intra-instrument validation. We then show comparisons with the plasma density and temperature measurements derived from the TIMED GUVI ultraviolet imager, the Millstone Hill ground based incoherent scatter radar, and DIAS digisondes, Finally we show one of several observations of night-time equatorial density holes demonstrating the capabilities of the probes for monitoring mid and low latitude plasma processes. Coffey, Victoria; Wright, Kenneth; Minow, Joseph; Chandler, Michael; Parker, Linda; Published by: Published on: |
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In-Situ F2-Region Plasma Density and Temperature Measurements from the International Space Station Coffey, Victoria; Wright, Kenneth; Minow, Joseph; Published by: Published on: |
| 2007 |
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Validation of ISS Floating Potential Measurement Unit Electron Densities and Temperatures Validation of the Floating Potential Measurement Unit (FPMU) electron density and temperature measurements is an important step in the process of evaluating International Space Station spacecraft charging issues .including vehicle arcing and hazards to crew during extravehicular activities. The highest potentials observed on Space Station are due to the combined VxB effects on a large spacecraft and the collection of ionospheric electron and ion currents by the 160 V US solar array modules. Ionospheric electron environments are needed for input to the ISS spacecraft charging models used to predict the severity and frequency of occurrence of ISS charging hazards. Validation of these charging models requires comparing their predictions with measured FPMU values. Of course, the FPMU measurements themselves must also be validated independently for use in manned flight safety work. This presentation compares electron density and temperatures derived from the FPMU Langmuir probes and Plasma Impedance Probe against the independent density and temperature measurements from ultraviolet imagers, ground based incoherent scatter radar, and ionosonde sites. Coffey, V.; Minow, J.; Schneider, T.; Vaughn, J.; Craven, P.; Parker, L.; Bui, T.; Wright, K.; Koontz, S.; Published by: Published on: 06/2007 |
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Longitudinal structure of the vertical E$\times$ B drift and ion density seen from ROCSAT-1 Kil, Hyosub; Oh, S-J; Kelley, MC; Paxton, LJ; England, SL; Talaat, E; Min, K-W; Su, S-Y; Published by: Geophysical Research Letters Published on: |
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Kil, H; Oh, S-J; Paxton, LJ; Zhang, Y; Su, S-Y; Min, K-W; Published by: Geophysical research letters Published on: |
| 2006 |
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Application of thermospheric general circulation models for space weather operations Fuller-Rowell, T.J.; Codrescu, M.V.; Minter, C.F.; Strickland, D.; Published by: Advances in Space Research Published on: Jan-01-2006 YEAR: 2006 DOI: 10.1016/j.asr.2005.12.020 |
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PHYSICAL INTERPRETATION OF THE THERMOSPHERE-IONOSPHERE RESPONSE TO THE APRIL 2002 MAGNETIC STORM Fedrizzi, M; Fuller-Rowell, TJ; Codrescu, M; Araujo-Pradere, EA; Minter, CF; Khalsa, H; Maruyama, N; Anderson, D; Anghel, A; Published by: Published on: |
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Effects of Solar Activity Variations on the Low Latitude Topside Nighttime Ionosphere Min, K.; Kim, H.; Park, J.; Kil, H.; Lee, J.; Lee, E.; Published by: Published on: |
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The global morphology of the vertical ExB drift in the equatorial region Kil, H; Oh, S; Paxton, LJ; Min, K; Su, S; Published by: Published on: |
| 2005 |
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Park, Jaeheung; Min, Kyoung; Kim, Vitaly; Kil, Hyosub; Lee, Jae-Jin; Kim, Hee-Jun; Lee, Ensang; Lee, Dae; Published by: Journal of Geophysical Research: Space Physics Published on: |
| 2003 |
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Characterizing Polar Layered Deposits at the Martian North Pole: An Assessment of Local Variations Milkovich, SM; , Head; Milliken, RE; Mustard, JF; Minitti, ME; Hamilton, VE; Wyatt, MB; Mischna, MA; McCleese, DJ; Richardson, MI; , others; Published by: Published on: |
| 2002 |
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Lee, JJ; Min, KW; Kim, VP; Hegai, VV; Oyama, K-I; Rich, FJ; Kim, J; Published by: Geophysical research letters Published on: |
| 1998 |
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Swaminathan, PK; Strobel, DF; Kupperman, DG; Kumar, Krishna; Acton, L; DeMajistre, R; Yee, J-H; Paxton, L; Anderson, DE; Strickland, DJ; , others; Published by: Journal of Geophysical Research: Space Physics Published on: |
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