Comparison between ionospheric convection vortices and the associated equivalent currents

Details Comparison between ionospheric convection vortices and the associated equivalent currents Comparison between ionospheric convection vortices and the associated equivalent currents

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm51c0383l&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM51C-0383

Physics

5734 Magnetic Fields And Magnetism, 2463 Plasma Convection, 2708 Current Systems (2409)

Scientific paper

The equivalent current pattern derived from CANOPUS, NRCAN/GSC and MACCS magnetometers has been compared with the ionospheric convection pattern observed by SuperDARN HF radars. The discrepancies between the equivalent convection (EQC) and the SuperDARN-observed convection (SDC) patterns are explained in terms of the effect of day-night photoionization conductance gradient and the coupling between field-aligned currents (FACs) and ionospheric conductances. In particular, the agreement between the EQC and SDC patterns is usually worse for a counterclockwise convection vortex than for a clockwise cell, but a consistent pattern of discrepancy for counterclockwise convection vortices has been found. We suggest that the discrepancies are due to a downward FAC-conductance coupling process. Since the counterclockwise vortices and clockwise vortices occur predominantly in the dawn and dusk sectors, respectively, in accordance with the usual 2-cell global convection pattern, the asymmetry between the EQC and SDC patterns for counterclockwise vortices and clockwise vortices would naturally lead to a dawn-dusk asymmetry as well. This is revealed by a global statistical study of the deviation of direction between the magnetic equivalent convection and the SuperDARN convection in different time sectors and latitudes. In the dawn sector, the statistical results reveal that, at lower latitudes, the EQC direction deviation is slightly counterclockwise with respect to the SDC direction, whereas the deviation is significantly clockwise at high latitudes. These deviations are consistent with the discrepancy pattern for counterclockwise convection vortices, as found in the individual vortex event studies.

Affiliated with

Also associated with

No associations

Rating

Comparison between ionospheric convection vortices and the associated equivalent currents 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 Comparison between ionospheric convection vortices and the associated equivalent currents, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Comparison between ionospheric convection vortices and the associated equivalent currents will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1470035