Ionospheric response to the sustained high geomagnetic activity during the March '89 great storm

Details Ionospheric response to the sustained high geomagnetic activity during the March '89 great storm Ionospheric response to the sustained high geomagnetic activity during the March '89 great storm

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9921341s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A11, p. 21,341-21,352

Mathematics

Logic

12

Atmospheric Models, Earth Ionosphere, Geomagnetism, Ionospheric Storms, Magnetic Storms, Satellite Observation, Time Dependence, Computerized Simulation, Convection, Dmsp Satellites, Ion Temperature, Ionospheric Temperature, Mathematical Models, Plasma Heating

Scientific paper

A simulation was conducted to model the high-latitude ionospheric to the sustaied level of high geomagnetic activity for the great magnetic storm period of March 13-14, 1989. The geomagnetic and solar activity indices and the Defense Meterological Satellite Program (DMSP) F8 and F9 satellite data for particle precipitation and high-latitude convection were used as inputs to a time-dependent ionospheric model (TDIM). The results of the TDIM were compared to both DMSP plasma density data and ground-based total electron content (TEC) measurements for the great storm period as well as with earlier storm observations. The comparisons show that the overall structure of the high-latitude ionosphere was dominated by an increased convection speed within the polar cap that led to increased ion temperatures. In turn, this enhanced the NO(+) density, raised the atomic-to-molecular ion transition height to over 300 km, decreased N(sub m)F(sub 2), increased h(sub m)F(sub 2), and in places either increased n(sub e) at 800 km or slightly decreased it. The morphology of the ionosphere under these extreme conditions was considerably different than that modeled for less distributed intervals. These differences included the character of the dayside tongue of ionization that no longer extended deep into the polar cap. Instead, as a result of the ion heating and consequent reduction in N(sub m)F(sub 2), a large polar hole occupied much of the polar region. This polar hole extended beyond the auroral oval and merged with the night sector midatitude trough. The limitaions associated with the applicability of the TDIM to the geomagnetic conditions present on March 13 and 14 are discussed. The primary limitations of the TDIM derive from the limited temporal resolution of the model input parameters and the lack of suitably dynamic thermospheric specification for the great storm conditions. These limitations leads to midlatitude ionospheric storm phases that do no follow those observed.

Affiliated with

Also associated with

No associations

Rating

Ionospheric response to the sustained high geomagnetic activity during the March '89 great storm 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 response to the sustained high geomagnetic activity during the March '89 great storm, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ionospheric response to the sustained high geomagnetic activity during the March '89 great storm will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1024886