NDLI: Search for Rapid Changes in the Visible-Light Corona during the 21 June 2001 Total Solar Eclipse

Content Provider	Springer Nature Link
Author	Rudawy, P. Phillips, K. J. H. Buczylko, A. Williams, D. R. Keenan, F. P.
Copyright Year	2010
Abstract	Some 8000 images obtained with the Solar Eclipse Coronal Imaging System (SECIS) fast-frame CCD camera instrument located at Lusaka, Zambia, during the total eclipse of 21 June 2001 have been analysed to search for short-period oscillations in intensity that could be a signature of solar coronal heating mechanisms by MHD wave dissipation. Images were taken in white-light and Fe xiv green-line (5303 Å) channels over 205 seconds (frame rate 39 s$^{−1}$), approximately the length of eclipse totality at this location, with a pixel size of four arcseconds square. The data are of considerably better quality than those that we obtained during the 11 August 1999 total eclipse (Rudawy et al.: Astron. Astrophys. 416, 1179, 2004), in that the images are much better exposed and enhancements in the drive system of the heliostat used gave a much improved image stability. Classical Fourier and wavelet techniques have been used to analyse the emission at 29 518 locations, of which 10 714 had emission at reasonably high levels, searching for periodic fluctuations with periods in the range 0.1 – 17 seconds (frequencies 0.06 – 10 Hz). While a number of possible periodicities were apparent in the wavelet analysis, none of the spatially and time-limited periodicities in the local brightness curves was found to be physically important. This implies that the pervasive Alfvén wave-like phenomena (Tomczyk et al.: Science 317, 1192, 2007) using polarimetric observations with the Coronal Multi-Channel Polarimeter (CoMP) instrument do not give rise to significant oscillatory intensity fluctuations.
Starting Page	305
Ending Page	327
Page Count	23
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	267
Issue Number	2
e-ISSN	1573093X
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-11-02
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sun: corona Sun: eclipses Sun: MHD Sun: waves Extraterrestrial Physics, Space Sciences Meteorology/Climatology Astrophysics and Astroparticles
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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Search for Rapid Changes in the Visible-Light Corona during the 21 June 2001 Total Solar Eclipse

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