scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...
scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...
scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...
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STP12 Abstracts<br />
Berlin, 12 - 16 July <strong>2010</strong><br />
SCOSTEP Symposium <strong>2010</strong><br />
Electric Field in the Earth's Ionosphere<br />
Klimenko Maxim 1 , Klimenko Vladimir 2<br />
1 2<br />
Kaliningrad State Technical University, WD IZMIRAN, Kaliningrad, Russia, WD IZMIRAN,<br />
Kaliningrad, Russia<br />
Thermal plasma in F-region of the Earth's ionosphere is magnetized. Therefore, the electric<br />
field causes tr<strong>an</strong>sport of plasma in F-region of ionosphere due to electromagnetic drift. The<br />
main mech<strong>an</strong>ism of formation such large-scale irregularities in distribution of thermal plasma<br />
in the ionosphere as equatorial ionization <strong>an</strong>omaly <strong>an</strong>d main ionospheric trough is the electric<br />
field. Equatorial electrojet <strong>an</strong>d the additional F3-layer at geomagnetic equator also are formed<br />
by electric field. The electric field in the ionosphere is generated by two sources:<br />
thermospheric <strong>an</strong>d magnetospheric. The dynamo electric field generated by thermospheric<br />
winds in the lower ionosphere brings the main contribution to the electric field at low latitudes<br />
in quiet geomagnetic conditions. However, during the geomagnetic disturb<strong>an</strong>ces the<br />
magnetospheric convection <strong>an</strong>d Alfven layer electric fields c<strong>an</strong> penetrate to the low latitudes.<br />
In high latitudes the magnetospheric convection electric field plays the main part. We have<br />
carried out the research of influence of electric field on the ionosphere of low <strong>an</strong>d high<br />
latitudes. Researches were carried out with use of the numerical model GSM TIP, developed<br />
in the West Department of IZMIRAN. We have consi<strong>der</strong>ed the influence of the electric field<br />
on behavior of the main ionospheric trough <strong>an</strong>d equatorial ionization <strong>an</strong>omaly. The influence<br />
of the dynamo electric field on auroral electrojet is consi<strong>der</strong>ed. It is shown, that the electric<br />
field of magnetospheric origin influences on equatorial electrojet. We have carried out the<br />
research of influence of electric field of magnetospheric convection <strong>an</strong>d Alfven layer on<br />
formation of additional F3-layer in the equatorial ionosphere. We also consi<strong>der</strong>ed the<br />
ionospheric effects of the modeling substorm <strong>an</strong>d storm sequence. Recently the researches of<br />
local ch<strong>an</strong>ges of such ionospheric parameters as foF2 <strong>an</strong>d TEC in quiet geomagnetic<br />
conditions got the special popularity. Separate cases of such ch<strong>an</strong>ges some researchers<br />
connect with the action in the ionosphere of the electric field of seismogenic origin. We show<br />
the results of modeling calculations of such situations with the additional zonal <strong>an</strong>d penetrated<br />
vertical electric field, presumably seismogenic origin.<br />
The present work was done un<strong>der</strong> support of the Russi<strong>an</strong> Foundation of Basic Research (Gr<strong>an</strong>t No. 08-05-<br />
00274).
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