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CORONAS-F/SPIRIT OBSERVATIONS OF SOLAR ERUPTIVE
EVENTS ON 17 AND 18 NOVEMBER, 2003
Slemzin V.A., Chertok I.M., Grechnev V.V., Kuzin S.V., Ignatiev A.P., Pertsov A.A., Zhitnik I.A., J.-P. Delaboudiniere ,
During the second rotation of the extraordinary complex of active regions 484(501), 486(508), and 488(507), the largest eruptive events were observed on 17 and 18 November 2003 with the SPIRIT telescope aboard the CORONAS-F spacecraft in the coronal spectral channel 175 å and transition region channel 304 å. The images were taken with 15 min cadence, which was interrupted each 93 min by 45 min shadows. In this respect, the SPIRIT observations essentially supplement the SOHO/EIT data where the interval between heliograms was about 6 hours at 171, 284, 304 å, and 12 min at 195 å. The derotated fixed-difference images display that in the both events under consideration, the halo-type coronal mass ejections (CMEs) were accompanied by a large southward meridional dimming (transient coronal hole). The observed similarity of this dimming in different spectral lines, related to specific temperatures of the solar plasma, testifies to the origin of the dimming due to the partial or entire opening of the magnetic fields in the corona and transition region in the course of the CME process. The 18 November eruptive event was also accompanied by complicated large-scale disturbances propagating from the eruptive center through the entire southwest quadrant. At that, the SPIRIT 304 å difference images display a somewhat delayed propagating dimming associated perhaps with a CME disconnection from pre-existing structures, which is not seen in the EIT 195 å images.