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Intensity Oscillation in the Corona as Observed during the Total Solar Eclipse of 29 March 2006

Singh, Jagdev and Hasan, SS and Gupta, GR and Banerjee, D and Muneer, S and Raju, KP and Bagare, SP and Srinivasan, R (2009) Intensity Oscillation in the Corona as Observed during the Total Solar Eclipse of 29 March 2006. In: Solar physics, 260 (1). pp. 125-134.

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Abstract

We obtained the images of the eastern part of the solar corona in the Fe xiv 530.3 nm (green) and Fe x 637.4 nm (red) coronal emission lines during the total solar eclipse of 29 March 2006 at Manavgat, Antalya, Turkey. The images were obtained using a 35 cm Meade telescope equipped with a Peltier-cooled 2k x 2k CCD and 0.3 nm pass-band interference filters at the rates of 2.95 s (exposure times of 100 ms) and 2.0 s (exposure times of 300 ms) in the Fe xiv and Fe x emission lines,respectively. The analysis of the data indicates intensity variations at some locations with period of strongest power around 27 s for the green line and 20 s for the red line. These results confirm earlier findings of variations in the continuum intensity with periods in the range of 5 to 56 s by Singh et al. (Solar Phys. 170, 235, 1997). The wavelet analysis has been used to identify significant intensity oscillations at all pixels within our field of view. Significant oscillations with high probability estimates were detected for some locations only. These locations seem to follow the boundary of an active region and in the neighborhood, rather than within the loops themselves. These intensity oscillations may be caused by fast magneto-sonic waves in the solar corona and partly account for heating of the plasma in the corona.

Item Type: Journal Article
Additional Information: copyright of this article belongs to Springer.
Keywords: Coronal heating;Emission lines;Intensity oscillations;Solar corona.
Department/Centre: Division of Physical & Mathematical Sciences > Astronomy and Astrophysics Programme
Division of Physical & Mathematical Sciences > Joint Astronomy Programme
Date Deposited: 11 Dec 2009 06:36
Last Modified: 19 Sep 2010 05:53
URI: http://eprints.iisc.ernet.in/id/eprint/25139

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