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|Title:||On the formation of a helmet streamer on January 24, 1992 at the south-west limb|
|Keywords:||Helmet streamer;X - rays|
|Publisher:||Astronomical Society of India|
|Citation:||BASI, Vol.28, No.1, pp. 33 - 45|
|Abstract:||We have analysed the soft X-ray images of the sun obtained with the YOHKOH satellite, white light coronal images observed at Mauna Loa and H-alpha pictures of the sun taken at Mitaka and Kodaikanal to study helmet streamers. We find that heating of a filament and subsequent brightening in X-rays, and eruption in the region lead to the formation of the helmet streamer on January 24, 1992. In another event of February 24, 1993, only the brightening and eruption-like expansion of the brightening in soft X-rays lead to the formation of the streamer. No H-alpha filament was seen in this region before and after the event of brightening in soft X-rays and formation of streamer on February 24, 1993. We, therefore, postulate that the plasma in the streamer comes from the solar surface during the X-ray eruption, and magnetic field of the region perhaps helps in containing the plasma and the formation of the streamer.|
|Appears in Collections:||BASI Publications|
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