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LONG-PERIOD PULSATION ACTIVITY DURING THE AUTUMN 2003 SERIES OF MAGNETIC DISTURBANCES
Potapov A., Guglielmi A., Tsegmed B., Kultima J.,
A review of long-period pulsation activity during autumn 2003 disturbances is given. The most prominent and strong event of a very strong and enduring long-period ULF activity was observed on 30-31 October 2003 by magnetic observatories over the whole Earth surface during the recovery phase of the magnetic storm, which had begun a day before, with SSC at 06:11 UT on October 29th, 2003. Amplitude of oscillations in the Pc5 frequency range was as high as 120 nT at mid-latitude stations. We use magnetic data from INTERMAGNET database, IMAGE magnetometer network, and Polar and GOES-10,-12 satellites. According to IMAGE data, Pc5 polarization pattern along a meridian does not coincide with that expected for field line resonance model. Latitude profile of H-component has its maximum at auroral latitudes. At mid-latitudes, Pc5 were observed at all local time sectors simultaneously with larger amplitude at prenoon or noon hours. Probable sources of the global magnetospheric wave activity within the framework of various models of Pc5 generation are compared with the observed pulsation characteristics. Possible consequences of large amplitude oscillations for charged particle acceleration owing to various ponderomotive mechanisms are discussed. The work was supported by INTAS 01-0013 and RFBR 03-05-64361 grants.