Bibliography
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Found 255 entries in the Bibliography.
Showing entries from 201 through 250
| 2008 |
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MRO/CRISM observations of Phobos and Deimos Murchie, SL; Choo, T; Humm, D; Rivkin, AS; Bibring, J-P; Langevin, Y; Gondet, B; Roush, TL; Duxbury, T; team, CRISM; , others; Published by: Published on: |
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The PECOS mission of small space weather satellites in the post DMSP era de La Beaujardiere, O; Hanscom, AFB; Rich, FJ; Cooke, DA; Mozer, J; Ober, D; Huang, C; Gentile, LC; Published by: Published on: |
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Lower Atmosphere Wave Effects on Ionospheric Variability Talaat, Elsayed; Yee, Jeng-Hwa; Paxton, Larry; DeMajistre, Robert; Christensen, Andrew; Mlynczak, MG; , Russell; Zhu, Xun; Sotirelis, Thomas; Kil, Hyosub; Published by: 37th COSPAR Scientific Assembly Published on: |
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Ionosphere disturbances observed throughout Southeast Asia of the superstorm of 20--22 November 2003 Ionospheric disturbances in the Southeast Asian region during the super magnetic storm of 20–22 November 2003 were investigated through an ionosonde chain and a GPS network assisted by the space-borne instruments. At early stage of the storm in the postsunset sector, large enhancements in the critical frequency of F2 layer and total electron content were observed at northern crest region of the equatorial ionization anomaly (EIA), which might be produced by both the storm meridional wind superimposed with traveling atmospheric disturbances and prompt penetration electric field (PPE). During the main phase of the storm when interplanetary magnetic field started a 12-h southward turning, equatorial ionosphere was elevated to a very high level which should be most probably caused by a long-duration PPE event. Meanwhile, at mid-low latitudes, ionosphere witnessed an initial simultaneous decrease then followed by drastic increases, which is very different from the past observations in this region (Reddy and Nishida, 1992). Combined analysis of the data from the ionosonde and other space-based measurement shows that for the present case the penetration efficiency of the interplanetary electric field (IEF) to the equatorial ionosphere was larger at night than in the daytime, which agrees with the results of Fejer et al. (2007) showing the ratios of PPE and IEF changes were highly variable with the local time. During the recovery phase, EIA was severely inhibited owing to a wind convergence and possibly because of the westward disturbance dynamo electric field. Zhao, B; Wan, W; Tschu, K; Igarashi, K; Kikuchi, T; Nozaki, K; Watari, S; Li, G; Paxton, LJ; Liu, L; , others; Published by: Journal of Geophysical Research: Space Physics Published on: YEAR: 2008 DOI: 10.1029/2008JA013054 |
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England, SL; Immel, TJ; Huba, JD; Published by: Journal of Geophysical Research: Space Physics Published on: |
| 2007 |
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Observations of a positive storm phase on September 10, 2005 In this study, we present multi-instrument observations of a strong positive phase of ionospheric storm, which occurred on September 10, 2005 during a moderate geomagnetic storm with minimum Dst=-60\ nT and maximum Kp=6\textendash. The daytime electron density measured by the Millstone Hill incoherent scatter radar (42.6\textdegreeN, 288.5\textdegreeE) increased after 13\ UT (\~8\ LT) compared with that before the storm. This increase is observed throughout the daytime, lasts for about 9\ h, and covers F-region altitudes above \~230\ km. At the altitude of 300\ km, the maximum increase in Ne reaches a factor of 3 by 19:30\textendash20:00\ UT and is accompanied by a \~1000\ K decrease in electron temperature, a \~100\textendash150\ K increase in ion temperature, and a strong upward drift. Observations by Arecibo ISR (18.3\textdegreeN, 293.3\textdegreeE) reveal similar features, with the maximum increase in electron density reaching a factor of 2.5 at 21:30\ UT, i.e. 1.5\textendash2\ h later than over Millstone Hill. The GPS TEC data show that the increase in electron density observed at Millstone Hill and Arecibo is only a part of a global picture reflected in TEC. The increase in TEC reaches a factor of 2 and covers middle and low latitudes at 19\ UT. At later times this increase moves to lower latitudes. A combination of mechanisms were involved in generation of positive phase. The penetration electric field resulted in Ne enhancements at subauroral and middle latitudes, the TAD/TID played an important role at middle and lower latitudes, and increase in O/N2 ratio could contribute to the observed positive phase at middle and lower latitudes. The results show the importance of an upward vertical drift at \~140\textendash250\ km altitude, which is observed for sustained period of time and assists in the convergence of ionization into the F-region. Goncharenko, L.P.; Foster, J.C.; Coster, A.J.; Huang, C.; Aponte, N.; Paxton, L.; Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on: 07/2007 YEAR: 2007 DOI: 10.1016/j.jastp.2006.09.011 |
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Basu, S; Huba, J; Makela, J; Ray, S; Groves, K; Published by: Published on: |
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Incorporation of UV Radiances into the USU GAIM Models Our primary goal is to incorporate UV radiances from the SSULI and SSUSI instruments, which will be flown on the NPOSSE satellites, into the USU GAIM models. A secondary goal is Published by: Published on: |
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The Variabilities of the Mesosphere and Lower Thermosphere as observed by TIMED Yee, J; Talaat, E; Zhu, X; Russell, J; Mlynczak, M; SKINNER, W; Paxton, L; Published by: Published on: |
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Inter-annual and long-term variations observed in the ITM system Talaat, ER; Yee, J; Ruohoniemi, JM; Zhu, X; DeMajistre, R; Russell, J; Mlynczak, M; Paxton, L; Christensen, A; Published by: Published on: |
| 2006 |
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McDonald, Sarah; Basu, Sunanda; Basu, Santimay; Groves, Keith; Valladares, Cesar; Scherliess, Ludger; Thompson, Donald; Schunk, Robert; Sojka, Jan; Zhu, Lie; Published by: Radio Science Published on: Jan-12-2006 YEAR: 2006 DOI: 10.1029/2005RS003366 |
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McDonald, Sarah; Basu, Sunanda; Basu, Santimay; Groves, Keith; Valladares, Cesar; Scherliess, Ludger; Thompson, Donald; Schunk, Robert; Sojka, Jan; Zhu, Lie; Published by: Radio Science Published on: Jan-12-2006 YEAR: 2006 DOI: 10.1029/2005RS003366 |
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We investigate the variations in the thermosphere and ionosphere using multi-instrument observations during the April 2002 period, with a particular focus on periods during small geomagnetic disturbances. Large and long-lasting reductions in the daytime electron density were observed at midlatitudes by incoherent scatter radars, ionosondes, and GPS receivers. These reductions reached 30\textendash50\% and were observed over an extended longitudinal area. They propagated to middle latitudes (35\textendash40\textdegreeN) in the case of a weak geomagnetic disturbance (Kp = 3-) and to low latitudes (0\textendash10\textdegreeN) in the case of a stronger disturbance (Kp = 5-). Data from the GUVI instrument aboard the TIMED satellite reveal a reduction in the daytime O/N2 ratio in the coincident area. Similar decreases are also predicted by the TIMEGCM/ASPEN model in both O/N2 ratio and electron density, though the magnitude of the decrease from the model is smaller than observed. We suggest that these ionospheric and thermospheric disturbances result from high-latitude energy input and efficient transport of regions with reduced O/N2 to lower latitudes. We discuss the possible role of a strong positive By component of the interplanetary magnetic field in the transport of regions with reduced O/N2. Goncharenko, L.; Salah, J.; Crowley, G.; Paxton, L.; Zhang, Y.; Coster, A.; Rideout, W.; Huang, C.; Zhang, S.; Reinisch, B.; Taran, V.; Published by: Journal of Geophysical Research Published on: 03/2006 YEAR: 2006 DOI: 10.1029/2004JA010683 Electron density; thermospheric composition; thermospheric wind |
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Basu, S; Basu, S; Makela, J; Miller, E; Dasgupta, A; Roy, S; Huba, J; Groves, K; Rich, F; Published by: Eos Trans. AGU Published on: |
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Modeling of Equatorial Anomaly Development and Collapse at Dusk Observed by TIMED/GUVI Basu, S; Huba, J; Makela, J; Miller, E; Groves, K; Published by: Published on: |
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Storm-time penetration electric fields and their effects Huang, Chaosong; Sazykin, Islav; Spiro, Robert; Goldstein, Jerry; Crowley, Geoff; Ruohoniemi, Michael; Published by: Published on: |
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Satellite-based correlation studies of mesospheric O2 and OH infrared emissions Thurgood, Brandon; Baker, Doran; Published by: Published on: |
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First Observations of the Ionosphere using the Tiny Ionospheric Photometer Coker, C; Dymond, KF; Budzien, SA; Chua, D; Liu, JY; Published by: Published on: |
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Goncharenko, L; Salah, J; Crowley, G; Paxton, LJ; Zhang, Y; Coster, A; Rideout, W; Huang, C; Zhang, S; Reinisch, B; , others; Published by: Journal of Geophysical Research: Space Physics Published on: |
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Ionospheric Measurements from the Tiny Ionospheric Photometer Coker, C; Dymond, KF; Budzien, SA; Chua, D; Published by: Published on: |
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Lower Atmosphere Effects on Thermospheric and Ionospheric Variability Talaat, ER; Yee, J; Paxton, L; DeMajistre, R; Christensen, A; Russell, J; Mlynczak, M; Zhu, X; Sotirelis, T; Smith, D; Published by: 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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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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Spacecraft Attitude Determination By spacecraft attitude, we mean how a spacecraft is oriented in space. Every spacecraft carries a complement of instruments, usually called a payload, that must be directed in some way Shuster, Malcolm; Dellinger, Wayne; Published by: Fundamentals of Space Systems Published on: |
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Global ionospheric disturbances during super magnetic storms Huang, C; Foster, J; Rideout, W; Zhang, Y; Paxton, L; Published by: Published on: |
| 2004 |
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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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GUVI: a hyperspectral imager for geospace The Global Ultraviolet Imager (GUVI) is an imaging spectrometer on the NASA TIMED spacecraft which was launched on December 7, 2001. This instrument produces a far ultraviolet (FUV) data cube of spatial and spectral information at each step of a scan mirror - that scan mirror covers 140 deg in the cross track direction - a span that includes on limb. GUVI produces simultaneous monochromatic images at five "colors" (121.6 nm, 130.4 nm, 135.6 nm, and in broader bands at 140-150 nm and 165-180 nm) as its field of view is scanned from horizon to horizon. The instrument consists of a scan mirror feeding a parabolic telescope and Rowland circle spectrometer, with a wedge-and-strip detector at the focal plane. We describe the design, and give an overview of the environmental parameters that will be measured. GUVI is a modified version of the Special Sensor Ultraviolet Spectrographic Imager (SSUSI), which was launched on the DMSP Block 5D3 F16 satellite on October 18, 2003 and is slated to fly on DMSP satellites F17 through F20, as well. We present some results the science analysis of the GUVI data to demonstrate its relevance to the space weather community. Paxton, L.; Christensen, Andrew; Morrison, Daniel; Wolven, Brian; Kil, Hyosub; Zhang, Yongliang; Ogorzalek, Bernard; Humm, David; Goldsten, John; DeMajistre, Robert; Meng, Ching-I.; Published by: Published on: YEAR: 2004 DOI: 10.1117/12.579171 |
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Kozyra, JU; Anderson, BJ; Brandt, PC; Cattell, CA; Dombeck, JP; Hairston, MR; Heelis, RA; Huang, CY; Korth, H; Liemohn, MW; , others; Published by: Published on: |
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McDonald, SE; Basu, S; Groves, K; Scherliess, L; Thompson, DC; Schunk, RW; Sojka, JJ; Zhu, L; Published by: Published on: |
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McDonald, SE; Basu, S; Groves, K; Scherliess, L; Thompson, DC; Schunk, RW; Sojka, JJ; Zhu, L; Published by: Published on: |
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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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Comparison of common climatology data Frahm, RA; Wüest, M; Winningham, JD; , Sharber; Jennings, JK; Crowley, G; Link, R; Hudson, A; Published by: Advances in Space Research Published on: |
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Advanced time-of-flight system-on-a-chip for remote sensing instruments Paschalidis, Nicholas; Stamatopoulos, Nick; Karadamoglou, Kosta; Kottaras, George; Paschalidis, Vasilis; Sarris, Emmanuel; Mitchell, Donald; Humm, David; Paxton, Larry; McNutt, Ralph; 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 |
| 2002 |
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On-Orbit Characterization of the TIMED Global UltraViolet Imager (GUVI) Wolven, BC; Paxton, LJ; Morrison, D; Humm, DC; Ogorzalek, BS; Kil, H; Zhang, Y; Meng, C; Christensen, A; Published by: Published on: |
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Gladstone, G; Retherford, K; Solomon, S; Gerard, J; Hubert, Beno\^\it; Meurant, M; Paxton, L; Wolven, B; Zhang, Yinghong; Morrison, D; , others; Published by: Published on: |
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GUVI Instrument Performance: Validation and Evaluation of Ability to Meet Science Objectives Paxton, LJ; Morrison, D; Wolven, BC; Humm, DC; Ogorzalek, BS; Zhang, Y; Kil, H; Meng, C; Christensen, AB; Published by: Published on: |
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Imaging Space Weather in the Far Ultraviolet with NASA TIMED GUVI Paxton, L; Morrison, D; Zhang, Y; Kil, H; Wolven, B; Humm, D; Ogorzalek, B; Weiss, M; Wood, W; Barnes, R; , others; Published by: Published on: |
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On-Orbit Calibration and Characterization of the Global Ultraviolet Imager on TIMED Paxton, L; Morrison, D; Wolven, B; Kil, H; Humm, D; Ogorzalek, B; Zhang, Y; Meng, C; Christensen, A; Published by: Published on: |
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Paxton, L; Morrison, D; Zhang, Y; Kil, H; Wolven, B; Humm, D; Ogorzalek, B; Weiss, M; Wood, W; Barnes, R; , others; Published by: Published on: |
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Morrison, Daniel; Paxton, Larry; Humm, David; Wolven, Brian; Kil, Hyosub; Zhang, Yongliang; Ogorzalek, Bernard; Meng, Ching-I; Published by: Published on: |
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Ionospheric and dayglow responses to the radiative phase of the Bastille Day flare Meier, RR; Warren, HP; Nicholas, AC; Bishop, J; Huba, JD; Drob, DP; Lean, JL; Picone, JM; Mariska, JT; Joyce, G; , others; Published by: Geophysical research letters Published on: |
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Operational sensors are designed and intended to reliably produce the measurements needed to develop high-value key environmental parameters. The Special Sensor Ultraviolet Spectrographic Imager (SSUSI) is slated to fly on the next five Defense Meteorological Satellite Program launches (beginning with the launch of F16 in Fall 2001). SSUSI will routinely produce maps of ionospheric and upper atmospheric composition and image the aurora. In this paper we describe these products and our validation plans and the process through which we can assure our sponsors and data products users of the reliability and accuracy of these products. Paxton, L.J.; Morrison, Daniel; Zhang, Yongliang; Kil, Hyosub; Wolven, Brian; Ogorzalek, Bernard; Humm, David; Meng, Ching-I.; Published by: Published on: YEAR: 2002 DOI: 10.1117/12.454268 |
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The Special Sensor Ultraviolet Spectrographic Imager (SSUSI) is currently slated for launch on the Defense Meteorological Satellite Program (DMSP) F-16 in November 2001. This instrument consists of a scanning imaging spectrograph (SIS) whose field-of-view is scanned from horizon-to-horizon and a nadir-looking photometer system (NPS). It will provide operational information about the state of the atmosphere above 100 km. The unique problems incurred by the observational requirements (e.g. that we be able to make daytime and nighttime observations) and the design trade-offs needed to meet those requirements were strong drivers on calibration requirements. Those design trade-offs and the expectation that the instrument calibration will change appreciably in-flight have led to the requirement to perform a large instrument characterization in-flight using only natural sources. We focus, in this paper, on the flight characterization of the SSUSI instrument. This includes discussions of the stellar calibration approach for radiometric calibration, measurements of internally scattered light, sensitivity to the South Atlantic Anomaly, measurements of changing pulse height distributions, and measuring changing reflectivity of a nadir viewing scan mirror. In addition, the calibration of the NPS system using natural sources is addressed. Morrison, D.; Paxton, L.J.; Humm, D.~C.; Wolven, B.; Kil, H.; Zhang, Y.; Ogorzalek, B.~S.; Meng, C.-I.; Published by: Published on: |
| 2001 |
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Morrison, D; Paxton, LJ; Humm, DC; Wolven, B; Kil, H; Zhang, Y; Ogorzalek, BS; Meng, C-I; Published by: Published on: |
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Wolven, BC; Paxton, LJ; Morrison, D; Zhu, X; Talaat, E; Zhang, Y; Kil, H; Meng, C; Yee, J; Published by: Published on: |
| 1999 |
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Paxton, Larry; Christensen, Andrew; Humm, David; Ogorzalek, Bernard; Pardoe, Thompson; Morrison, Daniel; Weiss, Michele; Crain, W; Lew, Patricia; Mabry, Dan; , others; Published by: Published on: |
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Goldsten, John; Humm, David; Paxton, Larry; Ogorzalek, Bernard; Gary, Stephen; Hayes, John; Boldt, John; Published by: Published on: |