Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa33a1441r&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA33A-1441
Physics
[2427] Ionosphere / Ionosphere/Atmosphere Interactions, [2435] Ionosphere / Ionospheric Disturbances, [2437] Ionosphere / Ionospheric Dynamics
Scientific paper
Electron density gradients can impact a variety of communication and navigation systems. During geomagnetic storms, they are responsible for degraded positioning accuracies of global navigation services systems (GNSS). Their impacts can be especially severe for services that depend on real-time, high precision GPS positioning. Large electron density gradients have frequently been associated with solar and geomagnetic drivers, which couple the ionosphere with the magnetosphere and heliosphere. Here we will discuss smaller scale electron gradients that are produced through processes that couple the ionosphere to the lower atmosphere. Specifically we will describe the variations in electron density that we have observed in the low-latitude ionosphere several days after periods of high-latitude stratospheric sudden warmings. These low-latitude variations have a well pronounced semidiurnal character. In the morning, a 50-100% increase in electron density over the background mean was observed, followed by a ~50% suppression in electron density in the afternoon. Also associated with these sudden stratospheric warming events are large electron density gradients in the equatorial region during pre-dawn periods. Finally, we will describe the enhancement and variation of electron density fluctuations observed in the European and North American mid-latitudes during periods of stratospheric warmings.
Coster Anthea J.
Goncharenko Larisa P.
Rideout W.
Tsugawa Takuya
Valladares Cesar E.
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