Solar Extreme Events of 2003:
Fundamental Science and Applied Aspects

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Giant X-Ray Bursts on Oct.28 and Nov.4, 2003 observed by Cluster
Fritz T.A., Zong Q.-G.,

The four-satellite Cluster mission carries energetic electron instrumentation as part of the RAPID experiment [Research with Adaptive Particle Imaging Detectors, Patrick Daly (PI)] which responded in a continuous but surprising manner to the two large flares on October 28 and November 4, 2003. At least a portion of this response was due to solar X-rays, which in the case of the November 4th event, saturated X-ray detectors on the NOAA GOES and NASA HESSI satellites. Cluster was located around 19 MLT near the magnetopause and was not affected by any magnetospheric electron background at the time of both the Oct. 28th and Nov 4th events. Energy dispersion signatures, first from low energy to high followed by high energy to low versus time were observed for both giant X-ray bursts. During the November 4th event, the RAPID instrument on s/c2 was in a mode that permitted the full 3D distribution (144 pixels) to be obtained over the unit sphere. All of the counts recorded initially from s/c2 were registered by the two pixels that 'see' the disk of the sun during the 4 sec rotation of the s/c. Later the 3D response broaden to indicate a response to flare associated electrons. We will analyze and report on the energy dependent signature of the response of the Imaging Electron Spectrometers [IES] to these intense X-ray fluxes in terms of sensor implications and possible physical insights for the flares.

Skobeltsyn Institute of Nuclear Physics, Moscow State University, 2004