Ionospheric convection during the magnetic storm of 20-21 March 1991

Details Ionospheric convection during the magnetic storm of 20-21 March 1991 Ionospheric convection during the magnetic storm of 20-21 March 1991

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994angeo..12.1174t&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 12, no. 12, p. 1174-1191

Physics

13

Convective Flow, Earth Ionosphere, Interplanetary Magnetic Fields, Magnetic Storms, Polar Regions, Coherent Radar, Explorer 47 Satellite, Incoherent Scatter Radar, Night

Scientific paper

We report on the response of high-latitude ionospheric convection during the magnetic storm of March 20-21 1990. IMP-8 measurements of solar wind plasma and interplanetary magnetic field (IMF), ionospheric convection flow measurements from the Wick and Goose Bay coherent radars, EISCAT, Millstone Hill and Sondrestorm incoherent radars and three digisondes at Millstone Hill, Goose Bay and Qaanaaq are presented. Two intervals of particular interest have been indentified. The first starts with a storm sudden commencement at 2243 UT on March 20 and includes the ionospheric activity in the following 7 h. The response time of the ionospheric convection to the southward tuning of the IMF in the dusk to midnight local times is found to be approximately half that measured in a similar study at comparable local times during more normal solar wind conditions. A subsequent reconfiguration of the nightside convection pattern was also observed, although it was not possible to distinguish between effects due to possible changes in B(sub y) and effects due to substorm activity. The second interval, 1200-2100 UT 21 March 1990, included a southward turning of the IMF which resulted in the B(sub z) component becoming -10 nT. The response time on the dayside to this change in the IMF at the magnetopause was approximately 15 min to 30 min which is a factor of approximately 2 greater than those previously measured at higher latitudes. A movement of the nightside flow reversal, possibly driven by current systems associated with the substorm expansion phases, was observed, implying that the nightside convection pattern can be dominated by substorm activity.

Affiliated with

Also associated with

No associations

Rating

Ionospheric convection during the magnetic storm of 20-21 March 1991 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 Ionospheric convection during the magnetic storm of 20-21 March 1991, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ionospheric convection during the magnetic storm of 20-21 March 1991 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1325727