Position of projections of the nightside auroral oval equatorward and poleward edges in the magnetosphere equatorial plane


Cite item

Full Text

Open Access Open Access
Restricted Access Access granted
Restricted Access Subscription Access

Abstract

The position of the auroral oval poleward and equatorward boundary projections on the equatorial plane in the nightside MLT sector during magnetically quiet periods (|AL| < 200 nT, |Dst| < 10 nT) has been determined. The oval boundary positions were determined according to the precipitation model developed at Polar Geophysical Institute (http://apm.pgia.ru/). The isotropy of the averaged plasma pressure and the experimentally confirmed balance of pressures during the nighttime have been taken into account. The morphological mapping method has been used to map the oval poleward and equatorward edges without the use of any magnetic field model on the assumption that the condition of magnetostatic equilibrium is valid. Ion pressures at ionospheric altitudes and in the equatorial plane have been compared. It has been shown that the auroral oval equatorward boundary in the midnight sector is localized at geocentric distances of ~7 RE, which is in good agreement with the position of the energetic particle injection boundary in the equatorial plane. The oval poleward edge is localized at the ~10 RE geocentric distance, which is in good agreement with the position of the equatorward boundary of the region with a high turbulence level in the Earth’s magnetosphere plasma sheet.

About the authors

I. P. Kirpichev

Space Research Institute

Author for correspondence.
Email: ikir@iki.rssi.ru
Russian Federation, Profsoyuznaya ul. 84/32, Moscow, 117997

O. I. Yagodkina

Polar Geophysical Institute, Apatity Division, Kola Scientific Center

Email: ikir@iki.rssi.ru
Russian Federation, ul. Fersmana 14, Apatity, Murmansk oblast, 184209

V. G. Vorobjev

Polar Geophysical Institute, Apatity Division, Kola Scientific Center

Email: ikir@iki.rssi.ru
Russian Federation, ul. Fersmana 14, Apatity, Murmansk oblast, 184209

E. E. Antonova

Skobeltsyn Research Institute of Nuclear Physics; Space Research Institute

Email: ikir@iki.rssi.ru
Russian Federation, Moscow, 119991; Profsoyuznaya ul. 84/32, Moscow, 117997

Supplementary files

Supplementary Files
Action
1. JATS XML

Copyright (c) 2016 Pleiades Publishing, Ltd.