Polar and FAST spacecraft measured evolution of time varying, field aligned Poynting flux and FAST electron kinetic energy flux during major geomagnetic storms in the inner magnetosphere

Details Polar and FAST spacecraft measured evolution of time varying, field aligned Poynting flux and FAST electron kinetic energy flux during major geomagnetic storms in the inner magnetosphere Polar and FAST spacecraft measured evolution of time varying, field aligned Poynting flux and FAST electron kinetic energy flux during major geomagnetic storms in the inner magnetosphere

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm41a1696t&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM41A-1696

Physics

[2730] Magnetospheric Physics / Magnetosphere: Inner, [2774] Magnetospheric Physics / Radiation Belts

Scientific paper

In this poster we present a study of the long term (~10 days) time evolution of the time varying, field aligned Poynting flux (mapped to 100 km), determined from electric and magnetic fields data measured at high altitudes by the Polar spacecraft and at low altitudes by FAST, in the night-side inner magnetosphere and plasma sheet boundary layer (PSBL) on field lines that map to mid and low latitudes over the course of large and major geomagnetic storms. The evolution of the intensity and foot-point (in terms of ILAT only) of the Poynting flux is compared to that of the electron kinetic energy flux measured by FAST and mapped to 100 km. In the study presented herein, data from several large and major geomagnetic storms are used; these storms are those of May 1998, October 1999, and October 2001. In these events, the field aligned Poynting flux measured by Polar and FAST is seen to intensify by up to three orders of magnitude (from ~0.01-10 ergs/cm^2/s) at low latitudes (< 65 degrees ILAT) during the main phase of the storms. The FAST measured electron kinetic energy flux is seen to intensify by about two orders of magnitude (~0.1-10 ergs/cm^2/s) during the same time at low latitudes. The field aligned Poynting flux at Polar and FAST is generally of sufficient intensity to power auroral acceleration processes at mid latitudes during magnetically quite intervals, and at low latitudes during storm times. In addition, the intensification of low latitude Poynting flux and electron kinetic energy flux during the main phase of geomagnetic storms is seen to be accompanied by a simultaneous drop-out of the energetic radiation belt particles measured by Polar. This indicates that the low latitude intensification of Poynting and electron kinetic energy flux may be used as a proxy for energetic particle loss from the radiation belts, and as a tool for the study of radiation belt dynamics during major storms.

Affiliated with

Also associated with

No associations

Rating

Polar and FAST spacecraft measured evolution of time varying, field aligned Poynting flux and FAST electron kinetic energy flux during major geomagnetic storms in the inner magnetosphere 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 Polar and FAST spacecraft measured evolution of time varying, field aligned Poynting flux and FAST electron kinetic energy flux during major geomagnetic storms in the inner magnetosphere, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polar and FAST spacecraft measured evolution of time varying, field aligned Poynting flux and FAST electron kinetic energy flux during major geomagnetic storms in the inner magnetosphere will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1879987