The response of the large scale ionospheric convection pattern to changes in the IMF and substorms - Results from the SUNDIAL 1987 campaign

Details The response of the large scale ionospheric convection pattern to changes in the IMF and substorms - Results from the SUNDIAL 1987 campaign The response of the large scale ionospheric convection pattern to changes in the IMF and substorms - Results from the SUNDIAL 1987 campaign

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993angeo..11..556l&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 11, no. 7, p. 556-571.

Computer Science

Sound

41

Convection Currents, Interplanetary Magnetic Fields, Ionospheric Currents, Radar Measurement, Satellite Sounding, Earth Magnetosphere, Eiscat Radar System (Europe)

Scientific paper

Multipoint observations of ionospheric convection, made during the SUNDIAL 1987 campaign (May 29 to June 8) which included two intervals of variable IMF Bz and By and several substorms, are used to examine the response of the ionospheric convection in the postdusk and midnight sectors to changes in the IMF Bz component, as well as the effect of substorms on ionospheric convection. It was found that the primary ionospheric effect of a change in the IMF from positive Bz to negative Bz is an enhancement in plasma flow magnitude. The response time of the ionospheric convection to each southward turning varies from 15 min near 1800 MLT to 30 min near 2100 MLT and close to one hour near midnight. During one of the substorms, which consisted of several intensifications, the nightside flow reversal moved progressively to earlier local times in response to each substorm intensification.

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