Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa41a1405y&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SA41A-1405
Other
2431 Ionosphere/Magnetosphere Interactions (2736), 2435 Ionospheric Disturbances, 2437 Ionospheric Dynamics, 2788 Magnetic Storms And Substorms (7954), 2790 Substorms
Scientific paper
The response of the ionosphere to geomagnetic activity such as magnetic storms and substorms is important for understanding the energy coupling process between the Sun and the Earth and for forecasting space weather changes. The mid-latitude and low-latitude ionospheric disturbances during magnetic storms have been the focus of study for years. With the introduction of simultaneous worldwide Global Position System (GPS) measurement, it becomes possible to investigate the global ionospheric total electron content (TEC) response to magnetic storms. Significant progress in understandings TEC response to magnetic storms has been obtained by using TEC data. However, while the effects of geomagnetic storm to the TEC has been well studied, the substorm effect on TEC has not been investigated thoroughly. It has been suggested that the penetration of a transient electric field associated with substorms may cause a direct association between magnetic and ionospheric disturbances without a time delay between high and low latitude. If so, such an effect can cause a much faster disturbance in the ionosphere with a time scale of minutes. At the present time, it is not clear whether (or how) ionospheric TEC can respond to substorm within minutes. In this study, we examine whether substorms can cause global change in TEC. We have identified about 500 substorms during fall 2001. There are about 50 storm-time substorms and 450 non-storm substorm. Two different types of TEC data will be used. One is global ionospheric maps (GIM) of TEC created by Jet Propulation Laboratory and the other is the TEC data derived from ~300 ground-based GPS receivers which are approximately aligned in three different longitudinal sectors. The time delay and percentage change of TEC as a function of substorm time will be examined to see how significant the substorm effect to the TEC distribution.
Galvan D.
Hsu Ted
Komjathy Attila
Mannucci Anthony
McPherron Robert
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