open access

https://hdl.handle.net/2115/38845

Dayside ionospheric uplift during strong geomagnetic storms as detected by the CHAMP, SAC-C, TOPEX and Jason-1 satellites

Ionosphere redistribution during strong geomagnetic storms as detected by the CHAMP, SAC-C, TOPEX and Jason-1 satellites

英語

Satellite measurements

2009-06-02

Elsevier Ltd.

Advances in Space Research

43(11)

1749-1756

Ionosphere response to severe geomagnetic storms that occurred in 2001-2003 was analyzed using data of global ionosphere maps (GIM), altimeter data from the Jason-1 and TOPEX satellites, and data of GPS receivers onboard CHAMP and SAC-C satellites. This allowed us to study in detail ionosphere redistribution due to geomagnetic storms, dayside ionospheric uplift and overall dayside TEC increase. It is shown that after the interplanetary magnetic field turns southward and intensifies, the crests of the equatorial ionization anomaly (EIA) travel poleward and the TEC value within the EIA area increases significantly (up to ～50%). GPS data from the SAC-C satellite show that during the main phase of geomagnetic storms TEC values above the altitude of 715 km are 2-3 times higher than during undisturbed conditions. These effects of dayside ionospheric uplift occur owing to the <<super-fountain effect>> and last few hours while the enhanced interplanetary electric field impinged on the magnetopause.

学術雑誌論文

Accepted Manuscript

0273-1177