Magnetic Field Line Topology in MHD Simulation Compared With IMAGE and POLAR Imaging Data for the Bastille Day Event

Details Magnetic Field Line Topology in MHD Simulation Compared With IMAGE and POLAR Imaging Data for the Bastille Day Event Magnetic Field Line Topology in MHD Simulation Compared With IMAGE and POLAR Imaging Data for the Bastille Day Event

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm31b04r&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM31B-04

Physics

2447 Modeling And Forecasting, 2736 Magnetosphere/Ionosphere Interactions, 2753 Numerical Modeling, 2788 Storms And Substorms

Scientific paper

Auroral images from the POLAR and IMAGE satellites give us snapshots of the ionospheric activity, updated regularly within 2-3 minutes. Selected wavelengths in visible and ultraviolet light provide the location of both ion and electron precipitation regions. Auroral emissions features are believed to be associated with closed magnetic field lines, even when disturbed by magnetospheric compression motions. We use a BATSRUS MHD simulation of the July 14-16, 2000 (Bastille Day) event and trace magnetic field lines starting at the ionosphere in both hemispheres. Open field lines that end in the interplanetary field form the polar caps and are believed to be largely free of auroral emissions features due to lack of particle precipitation. The field line tracings can show how accurately the MHD model reproduces the near-Earth magnetic topology as seen by the computed outline of the polar cap in the northern hemisphere compared with the satellite images. We find a very good match between the boundary of electron emissions and the computed polar cap boundary, but a discrepancy with the boundary of the ion precipitation. We interpret the difference between the computed polar cap boundary and the emission boundaries in terms of precipitation of ions accelerated in the compressed magnetosheath.

Affiliated with

Also associated with

No associations

Rating

Magnetic Field Line Topology in MHD Simulation Compared With IMAGE and POLAR Imaging Data for the Bastille Day Event 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 Magnetic Field Line Topology in MHD Simulation Compared With IMAGE and POLAR Imaging Data for the Bastille Day Event, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic Field Line Topology in MHD Simulation Compared With IMAGE and POLAR Imaging Data for the Bastille Day Event will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1277068