Bibliography
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Notice:
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Found 117 entries in the Bibliography.
Showing entries from 51 through 100
| 2008 |
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Long-term climatology and trends of global average thermospheric density Emmert, John; Picone, Michael; Meier, Robert; Published by: 37th COSPAR Scientific Assembly Published on: |
| 2007 |
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Strickland, D.; Lean, J.; Daniell, R.; Knight, H.; Woo, W.; Meier, R.; Straus, P.; Woods, T.; Eparvier, F.; McMullin, D.; Christensen, A.; Morrison, D.; Paxton, L.; Published by: Journal of Geophysical Research Published on: Jan-01-2007 YEAR: 2007 DOI: 10.1029/2006JA012074 |
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Strickland, DJ; Lean, JL; , Daniell; Knight, HK; Woo, WK; Meier, RR; Straus, PR; Woods, TN; Eparvier, FG; McMullin, DR; , others; Published by: Journal of Geophysical Research: Space Physics Published on: |
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Geospace Imaging: The Big Picture Published by: Published on: |
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Atomic oxygen photoionization rates computed with high resolution cross sections and solar fluxes Meier, RR; McLaughlin, Brendan; Warren, HP; Bishop, James; Published by: Geophysical research letters Published on: |
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Comparison of Column O/N2 From GUVI Limb Profiles and Disk Images Published by: Published on: |
| 2006 |
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Global thermosphere-ionosphere response to onset of 20 November 2003 magnetic storm Crowley, G.; Hackert, C.; Meier, R.; Strickland, D.; Paxton, L.; Pi, X.; Mannucci, A.; Christensen, A.; Morrison, D.; Bust, G.; Roble, R.; Curtis, N.; Wene, G.; Published by: Journal of Geophysical Research Published on: Jan-01-2006 YEAR: 2006 DOI: 10.1029/2005JA011518 |
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Emmert, JT; Meier, RR; Picone, JM; Lean, JL; Christensen, AB; Published by: Journal of Geophysical Research Published on: YEAR: 2006 DOI: 10.1029/2005JA011495 |
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Seasonal patterns in exospheric temperature: TIMED/GUVI versus NRLMSIS Stephan, AW; Meier, RR; Christensen, AB; Paxton, LJ; Published by: Published on: |
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Photoionization Rate of Atomic Oxygen Meier, RR; McLaughlin, BM; Warren, HP; Bishop, J; Published by: Published on: |
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Thermospheric density 2002–2004: TIMED/GUVI dayside limb observations and satellite drag We use TIMED/GUVI dayside limb observations of thermospheric far ultraviolet (FUV) dayglow to infer height profiles of total mass density during the period 2002–2004. We compare these data with total mass density derived from drag-induced changes in the orbits of satellites with perigee heights ranging from 200 to 600 km. To accommodate sampling differences, we compute the ratio of observed total mass density, filtered on a 3-day timescale, to that predicted by the NRLMSISE-00 empirical model. The GUVI densities are in good agreement with the orbit-derived densities in the 300–500 km range, where the correlation of the two independent measurements is ∼0.68 and the relative bias is less than 5\%, which is within the absolute uncertainty of the drag results. Of interest is a prolonged depletion of upper thermospheric density (relative to NRLMSIS) during July 2002, when densities from both techniques were 20–35\% smaller than those predicted by NRLMSIS. Our results represent the first validation of absolute densities derived from FUV limb scanning. Emmert, JT; Meier, RR; Picone, JM; Lean, JL; Christensen, AB; Published by: Journal of Geophysical Research: Space Physics Published on: YEAR: 2006 DOI: https://doi.org/10.1029/2005JA011495 |
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Effect of 27-day Solar Rotation on Thermospheric Density and Composition Crowley, G; Meier, B; Tapley, B; Bettadpur, S; Cheng, M; Ries, J; Abusali, P; Paxton, L; Christensen, A; Published by: Published on: |
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Thermospheric density 2002—2004: TIMED/GUVI dayside limb observations and satellite drag Emmert, JT; Meier, RR; Picone, JM; Lean, JL; Christensen, AB; Published by: Journal of Geophysical Research: Space Physics Published on: |
| 2005 |
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The global ionospheric asymmetry in total electron content Mendillo, Michael; Huang, Chia-Lin; Pi, Xiaoqing; Rishbeth, Henry; Meier, Robert; Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on: Jan-10-2005 YEAR: 2005 DOI: 10.1016/j.jastp.2005.06.021 |
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The NASA TIMED/GUVI experiment obtained unprecedented far ultraviolet images of thermospheric composition and temperature during the intense geomagnetic storm on 20\textendash21 November 2003. Geographic maps of the atomic oxygen to molecular nitrogen column density ratio show severe depletions that extend to the equator near the peak of the storm. This ratio is a key indicator of how the thermospheric composition is disrupted at high latitudes and how the perturbed air moves globally as a result of dynamical forcing. For example, migrating regions of low oxygen-to-nitrogen air are invariably found to correlate with high thermospheric temperatures. As well, GUVI obtained altitudinal-latitudinal (limb) images of temperature and composition, which show how the disturbances vary at different heights. The ASPEN thermospheric global circulation model was used to test our understanding of these remarkable images. The resulting simulations of thermospheric response show good agreement with GUVI data prior to the peak of the storm on 20 November. During the peak and recovery phases, serious discrepancies between data and model are seen. Although this initial attempt to model the storm is encouraging, much more detailed analysis is required, especially of the high-latitude inputs. The GUVI images demonstrate that far ultraviolet imaging is becoming a crucial component of space weather research and development. Meier, R.; Crowley, G.; Strickland, D.; Christensen, A.; Paxton, L.; Morrison, D.; Hackert, C.; Published by: Journal of Geophysical Research Published on: 09/2005 YEAR: 2005 DOI: 10.1029/2004JA010990 dayglow; geomagnetic storm; GUVI; remote sensing; thermospheric composition; TIMED |
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Antarctic mesospheric clouds formed from space shuttle exhaust New satellite observations reveal lower thermospheric transport of a space shuttle exhaust plume into the southern hemisphere two days after a January, 2003 launch. A day later, ground-based lidar observations in Antarctica identify iron ablated from the shuttle\textquoterights main engines. Additional satellite observations of polar mesospheric clouds (PMCs) show a burst that constitutes 10\textendash20\% of the PMC mass between 65\textendash79\textdegreeS during the 2002\textendash2003 season, comparable to previous results for an Arctic shuttle plume. This shows that shuttle exhaust can be an important global source of both PMC formation and variability. Stevens, Michael; Meier, R.; Chu, X.; DeLand, M.; Plane, J.; Published by: Geophysical Research Letters Published on: 07/2005 YEAR: 2005 DOI: 10.1029/2005GL023054 |
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Some of the most intense solar flares measured in 0.1 to 0.8 nm x-rays in recent history occurred near the end of 2003. The Nov 4 event is the largest in the NOAA records (X28) and the Oct 28 flare was the fourth most intense (X17). The Oct 29 flare was class X7. These flares are compared and contrasted to the July 14, 2000 Bastille Day (X10) event using the SOHO SEM 26.0 to 34.0 nm EUV and TIMED SEE 0.1\textendash194 nm data. High time resolution, \~30s ground-base GPS data and the GUVI FUV dayglow data are used to examine the flare-ionosphere relationship. In the 26.0 to 34.0 nm wavelength range, the Oct 28 flare is found to have a peak intensity greater than twice that of the Nov 4 flare, indicating strong spectral variability from flare-to-flare. Solar absorption of the EUV portion of the Nov 4 limb event is a possible cause. The dayside ionosphere responds dramatically (\~2.5 min 1/e rise time) to the x-ray and EUV input by an abrupt increase in total electron content (TEC). The Oct 28 TEC ionospheric peak enhancement at the subsolar point is \~25 TECU (25 \texttimes 1012 electrons/cm2) or 30\% above background. In comparison, the Nov 4, Oct 29 and the Bastille Day events have \~5\textendash7 TECU peak enhancements above background. The Oct 28 TEC enhancement lasts \~3 hrs, far longer than the flare duration. This latter ionospheric feature is consistent with increased electron production in the middle altitude ionosphere, where recombination rates are low. It is the EUV portion of the flare spectrum that is responsible for photoionization of this region. Further modeling will be necessary to fully understand the detailed physics and chemistry of flare-ionosphere coupling. Tsurutani, B.; Judge, D.; Guarnieri, F.; Gangopadhyay, P.; Jones, A.; Nuttall, J.; Zambon, G.A.; Didkovsky, L.; Mannucci, A.J.; Iijima, B.; Meier, R.; Immel, T.J.; Woods, T.; Prasad, S.; Floyd, L.; Huba, J.; Solomon, S.; Straus, P.; Viereck, R.; Published by: Geophysical Research Letters Published on: 02/2005 YEAR: 2005 DOI: 10.1029/2004GL021475 |
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Paxton, LJ; Zhang, Y; Meier, R; Strickland, D; Christensen, A; Crowley, G; Kozyra, J; Published by: Published on: |
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Day Side Observations of the Equatorial Anomaly Coakley, H; Swenson, CM; Moon, T; Meier, RR; Paxton, L; Christensen, A; Published by: Published on: |
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Emmert, JT; Meier, RR; Picone, JM; Lean, JL; Published by: Published on: |
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Craven, JD; Christensen, AB; Meier, RR; Paxton, LJ; Strickland, DJ; Published by: Published on: |
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Curtis, N; Crowley, G; Meier, R; Strickland, DJ; Paxton, LJ; Christensen, A; Morrison, D; Published by: Published on: |
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Vertical Structure of the Thermosphere and Ionosphere During Geomagnetic Storms in May 2002 Daniell, RE; Burns, AG; Strickland, DJ; Meier, RR; Paxton, LJ; Published by: Published on: |
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Meier, RR; Crowley, G; Strickland, DJ; Christensen, AB; Paxton, LJ; Morrison, D; Hackert, CL; Published by: Journal of Geophysical Research-Part A-Space Physics Published on: |
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Global Thermosphere-Ionosphere Response To Storms Crowley, G; Hackert, C; Meier, R; Paxton, L; Strickland, DJ; Zhang, Y; Pi, X; Manucci, A; Christensen, A; Morrison, D; Published by: Published on: |
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E-Layer Variations During an X-Class Flare Inferred from Far Ultraviolet Dayglow Observations Strickland, D.; Daniell, R.; Meier, R.; Lean, J.; Published by: Published on: |
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E-Layer Variations During X-Class Flares Inferred from Far Ultraviolet Dayglow Observations A study is reported that addresses dayglow and ionospheric response to X-class flares that occurred on Oct 28 and Nov 4 2003. Data of interest are 1) the dayglow observations by GUVI and solar EUV/X-ray observations by SEE (both on NASA\textquoterights TIMED satellite), 2) E-region measurements made by the EISCAT radar (on Oct 28) located at Troms\o, Norway, and 3) E-region/F-region IOX GPS occultation measurements (on Nov 4). The timing of the flares was fortunate in that TIMED was on the dayside portion of its orbit when activity peaked for both flares. During the Oct 28 flare, the EISCAT measurements were made near local noon under low geomagnetic activity conditions. Key results are the modeled and measured preflare and flare E-region electron densities. The basis of the modeled densities is QEUV, an integrated measure of solar EUV/XUV energy flux from 0 to 45 nm (that portion of the irradiance spectrum responsible for far ultraviolet dayglow). Use is made of spectra from SEE and the NRLEUV model along with GUVI nadir dayglow observations within its 135.6 and LBHS spectral channels to derive preflare and flare QEUV. The GUVI data are used to derive QEUV with the use of lookup tables, each distinguished by solar EUV/X-ray spectral shape, not by magnitude. Lookup tables have been produced using SEE and NRLEUV flare and preflare spectral shapes. The AURIC model is used to calculate the E-layer with the key input being a solar spectrum with a given shape (those discussed above) and magnitude (set by QEUV). The two sets of ionospheric measurements on their respective flare days show increases in NmE (E-layer peak density) by approximately a factor of three. The QEUV-based NmE agrees well with the measurements before and during these flares. NmE based on SEE spectra, on the other hand, exceeds the observed values, especially during the flares. The favorable agreement supports the derived GUVI QEUV values and argues for a significant reduction in SEE energy fluxes during periods of eruptive solar activity. Strickland, D.~J.; Daniell, R.~E.; Meier, R.~R.; Lean, J.~L.; Straus, P.~R.; Morrison, M.~D.; Paxton, L.; Published by: AGU Fall Meeting Abstracts Published on: 2479 Solar radiation and cosmic ray effects; 7519 Flares; 7549 Ultraviolet emissions; 7974 Solar effects |
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Global Thermosphere-Ionosphere Response to Geomagnetic Storms Crowley, G.; Hackert, C.; Meier, R.; Strickland, D.; Paxton, L.; Pi, X.; Manucci, A.; Christensen, A.; Morrison, D.; Bust, G.; Roble, R.; Curtis, N.; Published by: Published on: |
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SSUSI and GUVI limb scans of thermospheric neutral density changes during a geomagnetic storm Stephan, AW; Picone, JM; Meier, RR; Emmert, JT; Paxton, LJ; Morrison, D; Wolven, B; Kil, H; Published by: Published on: |
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Tsurutani, BT; Judge, DL; Meier, RR; Immel, TJ; Woods, TN; Published by: Geophysical research letters Published on: |
| 2004 |
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Similarity transformation method for data processing and visualization Picone, Michael; Meier, Robert; Published by: Published on: 3 |
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Quiet-time seasonal behavior of the thermosphere seen in the far ultraviolet dayglow The TIMED/GUVI instrument is a far ultraviolet spectrograph that obtains images in five spectrally resolved wavelength channels. These images yield information on the dayside composition, temperature, solar EUV flux, large-scale wave structures, and auroral processes. In this paper we present an overview analysis of Earth-disk images for four seasons (March, July, and September 2002 and January 2003). Days were selected during geomagnetically quiet periods when the Sun was nearly in the orbital plane (noon orbits). Two of GUVI\textquoterights five channels (designated as 135.6 and LBHS and dominated by OI 135.6 nm and short wavelength N2 LBH band emission, respectively) are used when the instrument is in its imaging mode. These data are used to derive O/N2 (column density ratio referenced to an N2 column density of 1017 cm-2). The AURIC model is used to generate a lookup table that relates O/N2 to the ratio of 135.6 to LBHS for a given solar zenith angle. Global images of derived O/N2 (designated as GUVI O/N2) are presented for the 4 days. The initial validation of the retrieved composition ratio comes from comparison with the NRLMSIS model. Good overall qualitative agreement is obtained between GUVI and NRLMSIS. Both data and model exhibit similar latitudinal behaviors on the near-solstice days, namely a distinct gradient with O/N2 decreasing from the winter to the summer hemisphere. Reductions in O/N2 in the vicinity of magnetic poles are seen in both GUVI and NRLMSIS images. Globally, O/N2 is smaller at the solstices and may be explained by the \textquotedblleftthermospheric spoon\textquotedblright mechanism discussed by Fuller-Rowell [1998]. Alternatively, the greater overall values at the equinoxes may arise in part from global response to greater Joule heating at these times of the year. The sensitivity of O/N2 to scalings of the N2 LBH cross section and solar EUV below 20 nm is also addressed in response to recent papers on these topics. This initial look at the GUVI data demonstrates great promise of FUV remote sensing as a way to observe thermospheric composition changes over broad geographic scales. Strickland, D.; Meier, R.; Walterscheid, R.; Christensen, A.; Paxton, L.; Morrison, D.; Craven, J.; Crowley, G.; Published by: Journal of Geophysical Research Published on: 01/2004 YEAR: 2004 DOI: 10.1029/2003JA010220 far ultraviolet; remote sensing; seasonal behavior; thermosphere |
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Observations of Tides and Planetary Waves from the stratosphere to the thermosphere Talaat, ER; Yee, J; Paxton, L; Zhang, Y; Zhu, X; Meier, R; Christensen, A; Mlynczak, M; RUSSELL, JM; Published by: Published on: |
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A Comparison of LORAAS and GUVI Observations of the Low-Latitude Ionosphere McDonald, SE; Makela, JJ; Meier, RR; Dymond, KF; Thonnard, SE; Budzien, SA; Christensen, AB; Paxton, LJ; Morrison, D; McCoy, RP; Published by: Published on: |
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Effect of The October-November 2003 Super-storms On Thermospheric Density and Composition Crowley, G; Tapley, B; Bettadpur, S; Cheng, M; Paxton, LJ; Zhang, Y; Morrison, D; Christensen, A; Meier, R; Strickland, DJ; Published by: Published on: |
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Global Thermosphere-Ionosphere Response to the October-November 2003 Storms Bronn, J; Crowley, G; Hackert, C; Meier, R; Paxton, L; Strickland, D; Christensen, A; Morrison, D; Zhang, Y; Straus, P; , others; Published by: Published on: |
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Looking at the November 20, 2003 super storm with TIMED/GUVI: Comparison with the TIMEGCM Meier, RR; Crowley, G; Strickland, DJ; Christensen, A; Paxton, L; Morrison, D; Published by: Published on: |
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Craven, JD; Christensen, AB; Meier, RR; Paxton, LJ; Strickland, DJ; Published by: Published on: |
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Solar EUV irradiance variability derived from terrestrial far ultraviolet dayglow observations Remotely sensed ultraviolet emissions from the Earth s upper atmosphere are shown to mirror fluctuations in solar EUV irradiance during July 2002, including the overall increase and decrease as the Sun rotated, and episodic increases associated with multiple solar flares. The TIMED/GUVI dayglow observations are used to derive a new quantity, QEUVGUVI, which is a measure of integrated solar EUV electromagnetic energy shortward of 45 nm. Both the absolute QEUVGUVI values and their modulation by solar rotation agree well with the corresponding solar EUV energy estimated by the NRLEUV irradiance variability model. The QEUVGUVI values do not support recent suggestions that the solar EUV irradiances estimated by the model of Hinteregger et al. be increased by a factor of four, nor even a factor of two. Strickland, D.J.; Lean, J.L.; Meier, R.R.; Christensen, A.B.; Paxton, L.J.; Morrison, D.; Craven, J.D.; Walterscheid, R.L.; Judge, D.L.; McMullin, D.R.; Published by: Geophysical research letters Published on: YEAR: 2004 DOI: 10.1029/2003GL018415 |
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Oxygen atom Rydberg emission in the equatorial ionosphere from radiative recombination Slanger, TG; Cosby, PC; Huestis, DL; Meier, RR; Published by: Journal of Geophysical Research: Space Physics Published on: |
| 2003 |
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Ionosphere and Upper Atmosphere (SIA): SIA 8 Stephan, AW; Meier, RR; Dymond, KF; Budzien, SA; McCoy, RP; Published by: Journal of Geophysical Research-Part A-Space Physics Published on: |
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Automatic Detection of Equatorial Plasma Bubbles in GUVI Data Henderson, S; Swenson, C; Straus, P; Kil, H; Christensen, A; Paxton, L; Morrison, D; Crowley, G; Meier, R; Craven, J; , others; Published by: Published on: |
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The Sun-Earth Connection as Viewed from GUVI on TIMED Paxton, L; Christensen, A; Avery, S; Craven, J; Crowley, G; Meier, R; Meng, C; Srickland, D; Swenson, C; Walterscheid, R; , others; Published by: Published on: |
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Craven, JD; Strickland, DJ; Meier, RR; Crowley, G; Christensen, AB; Paxton, LJ; Morrison, D; Avery, SK; Meng, C; Straus, PR; , others; Published by: Published on: |
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Strickland, DJ; Hecht, JH; Meier, RR; Conde, M; Christensen, AB; Morrison, D; Published by: Published on: |
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Retrieval of thermospheric temperature and N2, O, and O2 concentrations from GUVI limb scans Meier, RR; Strickland, DJ; Picone, JM; Christensen, AB; Paxton, LJ; Morrison, D; Kil, H; Bishop, J; Drob, D; Craven, JD; , others; Published by: Published on: |
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Initial observations with the Global Ultraviolet Imager (GUVI) in the NASA TIMED satellite mission The Global Ultraviolet Imager (GUVI) instrument carried aboard the NASA TIMED satellite measures the spectral radiance of the Earth\textquoterights far ultraviolet airglow in the spectral region from 120 to 180 nm using a cross-track scanning spectrometer design. Continuous operation of the instrument provides images of the Earth\textquoterights disk and limb in five selectable spectral bands. Also, spectra at fixed scanning mirror position can be obtained. Initial results demonstrate the quantitative functionality of the instrument for studies of the Earth\textquoterights dayglow, aurora, and ionosphere. Moreover, through forward modeling, the abundance of the major constituents of the thermosphere, O, N2, and O2\ and thermospheric temperatures can be retrieved from observations of the limb radiance. Variations of the column O/N2\ ratio can be deduced from sunlit disk observations. In regions of auroral precipitation not only can the aurora regions be geographically located and the auroral boundaries identified, but also the energy flux Q, the characteristic energy Eo, and a parameter fo\ that scales the abundance of neutral atomic oxygen can be derived. Radiance due to radiative recombination in the ionospheric F region is evident from both dayside and nightside observations of the Earth\textquoterights limb and disk, respectively. Regions of depleted F-region electron density are evident in the tropical Appleton anomaly regions, associated with so-called ionospheric \textquotedblleftbubbles.\textquotedblright Access to the GUVI data is provided through the GUVI website\ www.timed.jhuapl.edu\guvi. Christensen, AB; Paxton, LJ; Avery, S; Craven, J; Crowley, G; Humm, DC; Kil, H; Meier, RR; Meng, C-I; Morrison, D; , others; Published by: Journal of Geophysical Research: Space Physics (1978\textendash2012) Published on: YEAR: 2003 DOI: 10.1029/2003JA009918 airglow; AURORA; ultraviolet; imaging; satellite; atmosphere |
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Quenching rate coefficients for O+ (2P) derived from middle ultraviolet airglow Stephan, AW; Meier, RR; Dymond, KF; Budzien, SA; McCoy, RP; Published by: Journal of Geophysical Research: Space Physics Published on: |
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Lean, JL; Strickland, DJ; Meier, RR; Christensen, AB; Woods, TN; Eparvier, FG; McMullin, D; Judge, DL; Published by: Published on: |
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Airglow observations of low latitude O and N\_2 during a geomagnetic storm Stephan, AW; Meier, RR; Dymond, KF; Budzien, SA; McCoy, RP; Published by: Published on: |