Observations of convection vortices in the afternoon sector using the SuperDARN HF radars

Details Observations of convection vortices in the afternoon sector using the SuperDARN HF radars Observations of convection vortices in the afternoon sector using the SuperDARN HF radars

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...10019743b&link_type=abstract

Journal of Geophysical Research, Volume 100, Issue A10, p. 19743-19756

Physics

14

Ionosphere: Ionosphere/Magnetosphere Interactions, Ionosphere: Ionospheric Dynamics, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers

Scientific paper

Observation of convection vortices using the new SuperDARN HF radars are presented. The velocity field derived from the overlapping fields of view of the new HF radars at Kapuskasing, Ontario, and Saskatoon, Saskatchewan, Canada, often image the portion of the convection pattern near the convection reversal boundary. Observations from near the convection reversal boundary in the afternoon sector of October 22, 1993, showed two convection vortices evolving within the field of view of both radars. The first vortex appeared at about 2120 UT and the second at about 2145 UT: 1446 MLT and 1512 MLT, respectively. The vortices were roughly 900 km in diameter and moved tailward with a velocity of about 600 m/s. At the times the vortices were observed by the radars, ground-based magnetometers of the CANOPUS and MACCS chains show transient deflections of near 100 nT, and the GOES 6 and GOES 7 satellite magnetometers showed significant decreases in the magnetospheric magnetic field strength. Data from the Geotail satellite magnetometer lagged by an appropriate time interval indicated that there were southward turnings of the interplanetary magnetic field that coincided with the decreases of magnetospheric magnetic field strength. The observations differ in many respects from previously published vortex observations. It is theorized that the vortices were caused by the Kelvin-Helmholtz instability at the inner edge of the low-latitude boundary layer.

Affiliated with

Also associated with

No associations

Rating

Observations of convection vortices in the afternoon sector using the SuperDARN HF radars 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 Observations of convection vortices in the afternoon sector using the SuperDARN HF radars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Observations of convection vortices in the afternoon sector using the SuperDARN HF radars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1354725