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Found 6 entries in the Bibliography.
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2006 |
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 |
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: |
2005 |
A long-duration incoherent scatter radar (ISR) experiment was conducted at Millstone Hill and Svalbard from October 4\textendashNovember 4, 2002. Along with the simultaneous GUVI/TIMED neutral composition measurements, this 30-day run enabled us to study a number of thermosphere-ionosphere-magnetosphere phenomena. This paper focuses on the day-to-day variability and quasiperiodic oscillation of the ionosphere. The day-to-day variability under quiet magnetic conditions in electron density Ne, ion temperature Ti and electron temperature Te, respectively, changed with local time and height, with the largest variability in Ne and the smallest in Ti. Midnight through dawn was the period of largest variability. Quasiperiodic Ne oscillations were present with periods \>1 day. Some of these oscillations were correlated with changes in the neutral composition originating from geomagnetic activity, which altered the global atmospheric circulation as a result of high latitude heating processes as indicated in Svalbard ion temperature enhancements. However, the wave-type oscillation of Ne exhibits a downward phase progression which persists up to 600 km and prevails until a large storm appears to impose an upward phase progression. Zhang, Shun-Rong; Holt, John; Erickson, Phil; Lind, Frank; Foster, John; van Eyken, Anthony; Zhang, Yongliang; Paxton, Larry; Rideout, William; Goncharenko, Larisa; Campbell, Glenn; Published by: Geophysical Research Letters Published on: 01/2005 YEAR: 2005   DOI: 10.1029/2004GL020732 |
Zhang, Shun-Rong; Holt, John; Erickson, Phil; Lind, Frank; Foster, John; van Eyken, Anthony; Zhang, Yongliang; Paxton, Larry; Rideout, William; Goncharenko, Larisa; , others; Published by: Geophysical Research Letters Published on: |
Global ionospheric disturbances during super magnetic storms Huang, C; Foster, J; Rideout, W; Zhang, Y; Paxton, L; Published by: Published on: |
2003 |
Variability in the Mesosphere/Thermosphere/Ionosphere System During the Quiet Time of April 2002 Goncharenko, LP; Salah, J; Coster, A; Rideout, W; , Zhang; Paxton, L; Zhang, Y; Crowley, G; , Taran; Reinisch, B; , others; Published by: Published on: |
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