The Structure of Current System for Polar Substorm

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Presentation transcript:

The Structure of Current System for Polar Substorm A.Kotikov, Saint-Petersburg University A.Zaitsev, IZMIRAN, e-mail: zaitsev@izmiran.ru

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 currents D - complex current system Reference: Y.Feldstein, A.Zaitsev, 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

Eastward Electrojet : Facts and Rumors 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 Convective Explosive 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 ?

Magnetic Superstorm at Jan.11, 1997 Cape Kamenny, Yamal, Siberia Extra strong eastward electrojet Magnetic Superstorm at Jan.11, 1997 Cape Kamenny, Yamal, Siberia Harang discontinuity, South Pole station, 1977

Connection solar wind – magnetosphere – ionosphere currents Magnetometers of Prognoz-7, 8 and Interball satellites display the flapping movements of magnetopause in sequence with geomagnetic disturbances

Flapping motions of magnetosphere and vortexes formation Flapping movements might stimulate the substorm mesoscale processes

UV Aurora as observed by Polar satellite at July 15, 2000 auroral oval as predicted by GI , Alaska

X-ray imaging of particle precipitation

Example: Interhemispheric relationships in meso-scale auroras Global scale auroras are known to be similar, but how about mesoscales (L=100-1000 km)? ASC images: evolution of individual auroral structures can also have interhemispheric similarities. The real conjugate point of a station can move hundreds (tens) of km in longitude (latitude) during one hour. Reference: Sato et al., GRL 2005

Geophysical network on Yamal peninsula at 1972-1991. Since 1972 there are analog recordings 20 mm/hour Since 1985 first digital magnetometers were installed on Dixon, 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

Thank you all colleagues that I have a chance to meet you Thank you all colleagues that I have a chance to meet you ! Sincerely , Alexander Zaitsev My personal wish a great success to THEMIS project under leadership of Dr.V.Angelopulos !