The Structure of Current System for Polar Substorm. A.Kotikov, Saint-Petersburg University A.Zaitsev, IZMIRAN, e-mail: [email protected]
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Statistical current system based on IGY data – main sources are westward and eastward electrojets and currents in polar cap. A –convective, B – explosive,C – polar cap currentsD - complex current system
Sd-variation of the magnetic field in high latitudes with different intensity of magnetic disturbances,
Annales Geoph.,v.24, n.2, pp.1-8, 1968
Rumors: eastward electrojet does not exist as own source,
does not play a significant role in substorm
Facts: eastward electrojet is the essential source of polar . geomagnetic disturbances on his own,
two types of eastward electrojets are observed
Positioned around 15-18 LT positioned around 21-00 LT
Spread current sheet Distinctive jet-like current
Strong seasonal dependence No seasonal dependence
Have not accompany by riometer Accompanied by riometer absorption
Have not pronounced conjugacy Clear conjugate
Not display Harang discontinuity To form the Harang discontinuity
Have a connection with magnetosphere Have a connection with the partial
convection cell ? ring current ?
South Pole station, 1977
Magnetometers of Prognoz-7, 8 and Interball satellites display the flapping movements of magnetopause in sequence with geomagnetic disturbances
Flapping movements might stimulate the substorm mesoscale processes
auroral oval as predicted
by GI , Alaska
Global scale auroras are known to be similar, but how about mesoscales (L=100-1000 km)?
Example: Interhemispheric relationships in meso-scale auroras
Since 1972 there are analog recordings 20 mm/hour
Since 1985 first digital magnetometers were installed onDixon,
Bely Isl., Sabetta,
Cape Kamenny, Salekhard,
Analog data in WDC, digital data in Internet www.iki.rssi.ru/magbase
Public Outreach and Education Program in Seykha School: Polar Geomagnetic Disturbances as Indicator of Space Weather (will plan to use THEMIS data )
Seykha School, Yamal peninsula, Siberia, Russia
geomagnetic latitude 65,0 degree
My personal wish a great success to THEMIS project under leadership of Dr.V.Angelopulos !