Interhemispheric Conjugacy of High-Latitude Ionospheric Convection Determined From DMSP IMF-Dependent Models

Details Interhemispheric Conjugacy of High-Latitude Ionospheric Convection Determined From DMSP IMF-Dependent Models Interhemispheric Conjugacy of High-Latitude Ionospheric Convection Determined From DMSP IMF-Dependent Models

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm51d..09p&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM51D-09

Statistics

Applications

2409 Current Systems (2708), 2411 Electric Fields (2712), 2463 Plasma Convection, 2708 Current Systems (2409), 2712 Electric Fields (2411)

Scientific paper

In this study we report on a series of new ionospheric convection models constructed from the DMSP thermal ion drift measurements for both the northern and southern polar regions and for the summer, winter, and equinox. Applying the regression analysis technique to the IMF and DMSP data, we first obtained four basic elements of the convection response on 1-nT changes in the corresponding IMF component: (a) the two-cell, ``quasi-viscous'' convection (i.e., for IMF ~0 (b) the lobe convection cell controlled by the IMF azimuthal component; (c) the merging two-cell convection driven by the IMF southward orientation; and (d) the near-pole, two-cell ``reverse'' convection caused by the northward IMF. Then we fitted the obtained distributions of regression coefficients by the spherical harmonics; the resulting DMSP-based ionospheric convection model (DICM) is fully parameterized by the IMF strength and direction. After comparisons with other available high-latitude convection patterns organized by the IMF ``clock-angle'', we concluded that DICM shows all expected features of the solar wind-magnetosphere-ionosphere coupling. A new element in our model is its ``quasi-viscous'' term, which has not been yet obtained in any other satellite or radar-based ionospheric convection studies. Another new elements are the DICM seasonal dependence and interhemispheric symmetry/asymmetry features; for example, we found that the summer cross-polar potentials are 10-15% smaller than the winter potentials. The latter is in agreement with the seasonal dependence of field-aligned currents and with the voltage-current relationship required for the proper magnetosphere-ionosphere coupling. The obtained results justify a need in developing a unified approach for the modeling of high-latitude ionospheric convection from various data sources (i.e., from ground magnetometers, radars, digisondes, and satellite observations) allowing seemliness data assimilation in various ``space weather'' applications. The new models can be run on-line at the SPRL Web site http://www.sprl.umich.edu/mist/.

Affiliated with

Also associated with

No associations

Rating

Interhemispheric Conjugacy of High-Latitude Ionospheric Convection Determined From DMSP IMF-Dependent Models 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 Interhemispheric Conjugacy of High-Latitude Ionospheric Convection Determined From DMSP IMF-Dependent Models, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interhemispheric Conjugacy of High-Latitude Ionospheric Convection Determined From DMSP IMF-Dependent Models will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1386119