Kp-index and real geomagnetic activity based on the magnetospheric energy budget model

Details Kp-index and real geomagnetic activity based on the magnetospheric energy budget model Kp-index and real geomagnetic activity based on the magnetospheric energy budget model

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....9629g&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #9629

Computer Science

Scientific paper

Geomagnetic activity becomes apparent in different way in the various Earth's areas. Therefore it is difficult to find quantitative description of the real geomagnetic activity characterizing the magnetic field total situation throughout the Earth surface. Usually planetary Kp-index of the geomagnetic activity is used to analyze daily geomagnetic disturbances. Kp-index yearly variations determine the geomagnetic activity seasonal variations. The well-known conclusion about existing of equinox geomagnetic activity maximums bases on the Kp-index yearly variations analysis. The best quantitative equivalent of the total geomagnetic activity is the energy dissipation in the magnetospheric current systems. It is possible to determine how three-hour Kp-index reflects this dissipation based on the magnetospheric energy budget model for every hour of the Universal Time. The total dissipation power U_S is calculated as U_S = U_J + U_C + UDR . Uj is sum of Joule heating connected with the plasma convection increasing in the high latitude ionosphere and Joule heating connected with generation of an additional substorm current system. The first of them is calculated by using IZMEM model of high latitude ionosphere currents parameterized by the solar wind parameters. The second one is calculated based on AE-index and is equal 3,2108AE. U_C is the dissipation power connected with particle precipitation and is equal 1,75(AE/100+1,6)1010 . UDR is the ring current dissipation power and is estimated as - 0,741010(dDR/dt+DR/t). Here the ring current magnetic field is calculated as Dst - const(nV^2)1/2 - DT, where DT is the tail current magnetic field close to the Earth's equator. Kp-index correlation with U_S and its components U_J , U_C, UDR is analyzed.

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