Investigation of the dependence of the storm-induced ExB drift on the local time, storm phase, and storm size

Details Investigation of the dependence of the storm-induced ExB drift on the local time, storm phase, and storm size Investigation of the dependence of the storm-induced ExB drift on the local time, storm phase, and storm size

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa42a..04k&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA42A-04

Physics

2415 Equatorial Ionosphere, 2435 Ionospheric Disturbances, 2437 Ionospheric Dynamics, 2439 Ionospheric Irregularities

Scientific paper

We investigate the role of the ExB drift for the ionospheric disturbances during geomagnetic storms. The severe ionospheric disturbances in the low-latitude region during recent super storms (enhancement of plasma density on the dayside and severe equatorial plasma depletion on the nightside) are often attributed to the severe storm-induced electric fields or ExB drift. However, the changes of the solar EUV flux, global wind circulation pattern, and thermospheric neutral composition also significantly affect the ionospheric plasma density. The effect of the ExB drift cannot be singled out from these effects in the apparent changes of the plasma density. The in-situ measurements of the ion velocity from the DMSP and ROCSAT-1 satellites provide a direct way to investigate the change of the ExB drift during storm periods. We analyze about 70 geomagnetic storms in 2000-2005 and investigate the dependence of the ExB drift on the local time, storm phase, and storm size (Dst index). Our preliminary results during super storms show the different behavior of the ExB drift on the day and night sides. Abrupt increase and decrease of the upward ExB drift is observed on the dayside and nightside, respectively, during the main phase of the storms. We extend our investigation to the medium- and small-size storms and will establish the relationship between the storm size and the magnitude of the ExB drift.

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