The response of ionospheric convection in the polar cap to substorm activity

Details The response of ionospheric convection in the polar cap to substorm activity The response of ionospheric convection in the polar cap to substorm activity

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995angeo..13..147l&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 13, no. 2, p. 147-158

Mathematics

Logic

5

Convection, Earth Ionosphere, Magnetic Storms, Meteorological Radar, Polar Caps, Boundaries, Eiscat Radar System (Europe), Explorer 50 Satellite, Interplanetary Magnetic Fields, Magnetic Flux, Magnetohydrodynamic Flow, Magnetometers

Scientific paper

We report multi-instrument observations during an isolated substorm on 17 October 1989. The European Incoherent Scatter (EISCAT) radar operated in the SP-UK-POLI mode measuring ionospheric convection at latitudes 71 deg Lambda - 78 deg Lambda. Sub-Auroral Magnetometer Network (SAMNET) and the EISCAT Magnetometer Cross provide information on the timing of substorm expansion phase onset and subsequent intensifications, as well as the location of the field aligned and ionospheric currents associated with the substorm current wedge. Interplanetary Monitoring Platform-8 (IMP-8) magnetic field data are also included. Evidence of a substorm growth phase is provided by the equatorward motion of a flow reversal boundary across the EISCAT radar field of view at 2130 MLT, following a southward turning of the interplanetary magnetic field (IMF). We infer that the polar cap expanded as a result of the addition of open magnetic flux in the tail lobes during this interval. The flow reversal boundary, which is a lower limit to the polar cap boundary, reached an invariant latitude equatorward of 71 deg Lambda by the time of the expansion phase onset. We conclude that the substorm onset region in the ionosphere, defined by the westward electrojet, mapped to a part of the tail radially earthward of the boundary between open and closed magnetic flux, the distant neutral line. Thus the substorm was not initiated at the distant neutral line, although there is evidence that it remained active during the expansion phase.

Affiliated with

Also associated with

No associations

Rating

The response of ionospheric convection in the polar cap to substorm activity does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The response of ionospheric convection in the polar cap to substorm activity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The response of ionospheric convection in the polar cap to substorm activity will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1629926