High-latitude aurora during steady northward interplanetary magnetic field and changing IMF By

Details High-latitude aurora during steady northward interplanetary magnetic field and changing IMF By High-latitude aurora during steady northward interplanetary magnetic field and changing IMF By

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jgra..11002304c&link_type=abstract

Journal of Geophysical Research, Volume 110, Issue A2, CiteID A02304

Physics

8

Ionosphere: Auroral Ionosphere (2704), Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Magnetosphere: Outer, Ionosphere: Ionosphere/Magnetosphere Interactions (2736), Magnetospheric Physics: Energetic Particles: Precipitating

Scientific paper

High-latitude transpolar arcs (TPAs) are often observed during northward interplanetary magnetic field (IMF); of these, theta aurora are seen when transpolar arcs move in the dawn or dusk direction across the entire polar region in response to IMF By changes. Periods of study were chosen when By changes sign during steady northward IMF in order to determine the influence of IMF Bx, By, the strength of the IMF, the solar wind, and Earth dipole tilt on the occurrence and motion of high-latitude TPAs forming theta aurora. For a 4.5-year period there are 55 events for which IMF Bz is northward for at least 2 hours before and at least 3 hours after a By sign change. Of these, 19 occurred when the Polar satellite was over the Northern Hemisphere for the duration of the event. We find that for northward IMF and a By sign change theta aurora are almost always formed in the Northern Hemisphere, regardless of Bx and dipole tilt. This implies that theta aurorae form simultaneously in both hemispheres. IMF By does not appear to influence the intensity and duration of the arc. Strongest UV emissions occur in the summer hemisphere. Evolution time has a fairly complex dependence on solar wind parameters.

Affiliated with

Also associated with

No associations

Rating

High-latitude aurora during steady northward interplanetary magnetic field and changing IMF By 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 High-latitude aurora during steady northward interplanetary magnetic field and changing IMF By, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-latitude aurora during steady northward interplanetary magnetic field and changing IMF By will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1361462