Abstract
We observed 4B/X17.2 flare in Hα 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 radio-waves. 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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Asaiet al. 2002,ApJ,586, 624.
Bieber, W. J.et al. 2005,Geophys. Res. Lett.,32, L03S02, doi:10.1029/2004/GR:0214892.
Bougeret, J.-L.et al. 1995,Space Sci. Rev.,71, 231.
Brueckner, J.-L.et al. 1995,Solar Phys.,162, 357.
Delaboudiniere, J.-P.et al. 1995,Solar Phys.,162, 357.
Donea, A.-C., Lindsey, C. 2005,ApJ,630, 1168.
Emslie, A. G.et al. 2004,J. Geophys. Res. A.,109, 10104.
Gopalswamy, N.et al. 2005,J. Geophys. Res. A.,110, A09S00, doi: 10.1029/2005JA011268.
Grechnev, V. Vet al. 2005,J. Geophys. Res. A.,110, A09S07, doi: 10.1029/2004JA010931.
Handy, B. N.et al. 1999,Solar Phys.,187, 229.
Krucker, S., Hudson, H. S. 2004,Proc. of the SOHO 15 Workshop-Coronal heating, St. Andrews, Scotland, 6–9 September 2004 (ESA SP — 575, December 2004), p. 247.
Klassen, A.et al. 2005,J. Geophys. Res. A.,110, A09S04, doi:10.1029/2004JA010910.
Lin, R. P.et al. 2002,Solar Phys.,210, 3.
Luthi, T., Ludi, A., Magun, A. N. 2004,Astron. Astrophys.,420, 361.
Martens, P. C. H.et al. 1986,Solar Phys.,107, 95.
Martens, P. C. H., Kuin, N. P. M. 1989,Solar Phys.,22, 263.
Pick, M., Jean-Marie, K. A., Maia, D. J. F. 2005,ApJL,661, 97.
Poletto, G., Kopp, R. A. 1986, In: The lower atmosphere of solar flares (ed.) Neidig, D. F. (Sunspot: NSO), 453.
Qiu, J., Lee, J., Gray, D. E., Wang, H. 2002,ApJ,565, 1355.
Schmieder,et al. 1993,Adv. Space Res.,13, 119.
Singh, J, Gupta, S. S. 1995,Solar Phys.,158, 259.
Scherrer, P. H.et al. 1995,Solar Phys.,162, 129.
Tanget al. 1999,Solar Phys.,185, 143.
Uddin, W., Verma, V. K. 1998,BASI,26, 317.
White, S. M., Thomas, R. J., Schwartz, R. A. 2005,Solar Phys.,227, 231.
Zhang, Hong-Qiet al. 2003,Chinese J. Astron. Astrophys.,3, 491.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Uddin, W., Chandra, R. & Ali, S.S. Extremely energetic 4B/X17.2 flare and associated phenomena. J Astrophys Astron 27, 267–276 (2006). https://doi.org/10.1007/BF02702529
Issue Date:
DOI: https://doi.org/10.1007/BF02702529