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Ann. Geophys., 25, 569-574, 2007
www.ann-geophys.net/25/569/2007/
© European Geosciences Union 2007
Oxygen ion uplift and satellite drag effects during the 30 October 2003 daytime superfountain event
B. T. Tsurutani1,2, O. P. Verkhoglyadova1,3, A. J. Mannucci2, T. Araki4, A. Sato4, T. Tsuda1, and K. Yumoto5
1RISH, Kyoto University, Uji, Japan
2Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA
3IGPP, University of California at Riverside, Riverside, CA92521, USA
4KUGI, Kyoto University, Japan
5SERC, Kyushu University, Fukuoka, Japan
Abstract. The prompt penetration of interplanetary electric fields (IEFs) to the
dayside low-latitude ionosphere during the first ~2 h of a
superstorm is estimated and applied to a modified NRL SAMI2 code for the
30 October 2003 event. In our simulations, the dayside ionospheric O+
is convected to higher altitudes (~600 km) and higher latitudes
(~±25° to 30°), forming highly displaced equatorial
ionospheric anomaly (EIA) peaks. This feature plus others are consistent
with previously published CHAMP electron (TEC) measurements and with the
dayside superfountain model. The rapid upward motion of the O+ ions
causes neutral oxygen (O) uplift due to ion-neutral drag. It is estimated
that above ~400 km altitude the O densities within the displaced EIAs can
be increased substantially over quiet time values. The latter feature will
cause increased drag for low-altitude satellites. This newly predicted
phenomenon is expected to be typical for superstorm/IEF events.
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