October 30-31, 1992

Fig. 1. Modified images of the October 30-31, 1992 event.

(a) - This NRH image is adapted to show a very bright loop-like source over AR 7321 near the SW-limb identified with the X1.7 soft X-ray LDE event peaked on 30d at 17:30 UT (see the GOES-7 soft X-ray plot also at the upper right corner). The rest relatively weak regions and features are hardly seen on this radio heliogram.

(b) - The same NRH image, but in the restricted range of the brightness temperature of T_{b}~5000-20000 K. This radio heliogram is modified especially to display the blob groups and chains which can be seen in the south hemisphere. The brightest sources are saturated. Here and hereafter, the white features are radio filaments.

(c) - This modified NRH image shows some large scale microwave blob chains and structures. The large shining chain between points 1 and 3 (perhaps with a crossing in point 2) is predominated. The rhombus-like structure, outlined by points 2,3,4, and some northward bright feature, is evolved near the LDE source. Another large scale closed blob structure is developed later around the filament 5.

A movie showing evolution of microwave chains in this event by the NRH data   

GIF Animation (705 KB)

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Last update: 2 April 1999