Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsa33a..01k&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SA33A-01
Physics
2411 Electric Fields (2712), 2415 Equatorial Ionosphere, 2427 Ionosphere/Atmosphere Interactions (0335), 2437 Ionospheric Dynamics, 2447 Modeling And Forecasting
Scientific paper
In the given work the results of numerical calculations of global distribution of potential of electric field and linear density of zonal current in the ionosphere of the Earth during a solar eclipse are presented. Calculations have been executed on the basis of Global Self-consistent Model of the Thermosphere, Ionosphere and Protonosphere (GSM TIP), developed in WD IZMIRAN, added by the new block of calculation of electric fields in the ionosphere of the Earth. In calculations we considered superposition of magnetospheric convection electric field and dynamo field generated by thermospheric winds without taking into account the tides. The solar eclipse of hybrid type viewed in the given work has occurred on April, 8, 2005. The hybrid eclipse was visible from within a thin corridor, which traverses the Southern Hemisphere. The path of the shadow of the Moon has begun southeast of New Zealand and stretched across the Pacific Ocean to Panama, Columbia, and Venezuela. The eclipse has begun at 18.54 UT and has ended at 22.15 UT. From 20.30 UT till 21.10 UT the shadow of an eclipse transited in a neighborhood of geomagnetic equator. It is shown, that the solar eclipse caused impairment of equatorial electrojet intensity twice. First time it has occurred at the initial stage of the eclipse due to change in ionosphere conductivity in the region of influence of field aligned currents. It has led to change of distribution of magnetospheric convection electric field (18.58 UT - 19.06 UT). Second time it has occurred during the passage of a solar eclipse through geomagnetic equator with delay of 30 min (21.00 UT - 21.20 UT) due to local changes of ionospheric conductivity in the region of the eclipse and reorganization of thermospheric circulation to which the time delay is related. It has led to change of distribution of dynamo field in the region of geomagnetic equator.
Bryukhanov V. V.
Klimenko V. M.
Klimenko V. V.
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