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Sources of excitation and damping of Pc5 geomagnetic pulsations during the magnetic storms of October 29-31, 2003. Influence of the solar wind and auroral electrojets
Solovyev S.I., Moiseyev A.V., Du A., Engebretson M., Newitt L.R.,
Based on observation data of magnetic field variations at the global station chain the physical conditions of Pc5 pulsation excitation with T=3-5 min and their dependence on variations of the solar wind parameters and auroral electrojet evolution during the magnetic storms of October 29-31, 2003 are investigated. Pc5 pulsations are mainly registered on the dayside of the Earth on the recovery phase of Dst variations of three magnetic storms during the dynamic solar wind pressure increase. The maximum of Pc5 amplitude at morning and afternoon hours at latitudes ~ 65-67 degs with the appearance of additional maximum of oscillations at latitudes less/equal 60 deg was observed. The effect of global damping of Pc5 amplitude during auroral electrojet intensification with the evolution of both DP2 and DP1 current systems is detected. The greatest damping of Pc5 is observed in the sector from ~1500 till 0900 MLT at auroral latitudes and in other sectors at latitudes of electrojet intensification. However, intervals of Pc5 amplification with T=3 min or the beginning of their excitation at morning hours (0400-0900 MLT) simultaneously with the substorm onset in the premidnight sector are also marked. The comparison with data of Pc5 from geostationary satellites shows, that the Pc5 damping is probably happens at ionospheric heights. Possible mechanisms of excitation and damping of pulsations are discussed. The work was supported by RFBR grant 03-05-39011-GFEN.