Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006japa...27..255u&link_type=abstract
Journal of Astrophysics and Astronomy, vol. 27, no.2 & 3 P.267-276
Astronomy and Astrophysics
Astrophysics
1
Sun: Flares, Coronal Mass Ejections, Reconnection
Scientific paper
We observed 4B/X17.2 flare in Ha from super-active region NOAA 10486 at ARIES, Nainital. This is one of the largest flares of current solar cycle 23, which occurred near the Sun's center and produced extremely energetic emission almost at all wavelengths from γ-ray to radiowaves. The flare is associated with a bright/fast full-halo earth directed CME, strong type II, type III and type IV radio bursts, an intense proton event and GLE. This flare is well observed by SOHO,RHESSI and TRACE. Our Hα observations show the stretching/de-twisting and eruption of helically twisted S shaped (sigmoid) filament in the south-west direction of the active region with bright shock front followed by rapid increase in intensity and area of the gigantic flare. The flare shows almost similar evolution in Hα, EUV and UV. We measure the speed of Hα ribbon separation and the mean value is { 70 km s-1. This is used together with photospheric magnetic field to infer a magnetic reconnection rate at three HXR sources at the flare maximum. In this paper, we also discuss the energetics of active region filament, flare and associated CME.
Ali Syed Salman
Chandra Ramesh
Uddin Wahab
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