On open and closed field line regions in Tsyganenko's field model and their possible associations with horse collar auroras

Details On open and closed field line regions in Tsyganenko's field model and their possible associations with horse collar auroras On open and closed field line regions in Tsyganenko's field model and their possible associations with horse collar auroras

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.3811b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, March 1, 1991, p. 3811-3817. DOE-supported research.

Other

27

Astronomical Models, Auroras, Interplanetary Magnetic Fields, Magnetic Flux, Planetary Magnetospheres, Field Aligned Currents, Magnetopause, Magnetotails, Polar Caps, Polar Regions, Satellite Imagery

Scientific paper

The boundary between open and closed field lines is investigated in the empirical Tsyganenko (1987) magnetic field model. All field lines extending to distances beyond -70 R(E), the tailward velocity limit of the Tsyganenko model are defined as open, while all other field lines, which cross the equatorial plane earthward of -70 R(E) and are connected with the earth at both ends, are assumed closed. It is found that this boundary at the surface of the earth, identified as the polar cap boundary, can exhibit the arrowhead shape, pointed toward the sun, which is found in horse collar auroras. For increasing activity levels, the polar cap increases in area and becomes rounder, so that the arrowhead shape is less pronounced. The presence of a net B(y) component can also lead to considerable rounding of the open flux region. The arrowhead shape is found to be closely associated with the increase of B(z) from the midnight region to the flanks of the tail, consistent with a similar increase of the plasma sheet thickness.

Affiliated with

Also associated with

No associations

Rating

On open and closed field line regions in Tsyganenko's field model and their possible associations with horse collar auroras 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 On open and closed field line regions in Tsyganenko's field model and their possible associations with horse collar auroras, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On open and closed field line regions in Tsyganenko's field model and their possible associations with horse collar auroras will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1605967