Azimuthal expansion of high-latitude auroral arcs

Details Azimuthal expansion of high-latitude auroral arcs Azimuthal expansion of high-latitude auroral arcs

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003angeo..21.1793s&link_type=abstract

Annales Geophysicae, vol. 21, Issue 8, pp.1793-1805

Physics

4

Scientific paper

We used the TV auroral observations in Barentsburg (78.05° N 14.12° E) in Spitsbergen archipelago, together with the data of the CUTLASS HF radars and the POLAR satellite images to study azimuthal (in the east-west direction) expansion of the high-latitude auroral arcs. It is shown that the east or west edge of the arc moved in the same direction as the convection flow, westward in the pre-midnight sector and eastward in the post-midnight sector. The velocity of arc expansion was of the order of 2.5 km/s, which is 2 3 times larger than the convection velocity measured in the arc vicinity and 2 3 times smaller than the velocity of the bright patches propagating along the arc. The arc expanded from the active auroras seen from the POLAR satellite around midnight as a region of enhanced luminosity, which might be the auroral bulge or WTS. The pole- or equatorward drift of the arcs occurred at the velocity of the order of 100 m/s that was close to the convection velocity in the same direction. These experimental results can be well explained in terms of the interchange (or flute) instability.

Affiliated with

Also associated with

No associations

Rating

Azimuthal expansion of high-latitude auroral arcs 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 Azimuthal expansion of high-latitude auroral arcs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Azimuthal expansion of high-latitude auroral arcs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1663634