Observational evidence of sudden stratospheric warming effects on the equatorial ionospheric electric fields

Details Observational evidence of sudden stratospheric warming effects on the equatorial ionospheric electric fields Observational evidence of sudden stratospheric warming effects on the equatorial ionospheric electric fields

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa14a..06c&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA14A-06

Statistics

2411 Electric Fields (2712), 2415 Equatorial Ionosphere, 2427 Ionosphere/Atmosphere Interactions (0335), 2494 Instruments And Techniques, 3389 Tides And Planetary Waves

Scientific paper

In this work we present strong evidence that during major sudden stratospheric warming (SSW) events the equatorial ionospheric electric fields exhibit a unique and distinctive daytime pattern. In three out of four major SSW events in the last few years when Jicamarca Radio Observatory (JRO) ExB measurements were available, we have observed an anomalous temporal variation of the equatorial vertical ExB drifts, showing a strong semidiurnal variation. The three events occurred during quiet to moderate magnetic conditions (December 2000, January 2003 and January 2008). The fourth strong SSW event in February 1999 does not show the semidiurnal pattern, but it coincides with a magnetically disturbed period. Our observations consists mainly of incoherent scatter radar (ISR) ExB drifts, JULIA radar drifts from 150-km echoes and data from magnetometers. In the three cases with anomalous ExB behavior, the patterns are observed in the daytime ISR drifts and in JULIA drifts and/or magnetometer data. Previous ExB statistics using more than 35 years of Jicamarca ExB drifts and few years of AE-E satellite data show that quiet ExB variability is particularly large during the December solstice and cannot be explained by other phenomena (such as magnetic activity). As the dayside electrodynamics at equatorial latitude is strongly dependent on neutral wind in the lower thermosphere and therefore driven by tidal influences, observations of semidiurnal anomaly in ExB drifts may indicate tidal modulation during SSW events. Large diurnal and semidiurnal variations could be created in high latitude mesosphere and lower thermosphere in association with SSWs as indicated by TIMEGCM simulations (Liu and Roble, 2002). However, observations of such variations at low latitude is an unexpected finding which might shed new light on sources and mechanisms of quiet-time ionospheric variability.

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