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dc.contributor.author Habbal, Shadia Rifai
dc.contributor.author Woo, R.
dc.contributor.author Morgan, Huw
dc.date.accessioned 2008-12-17T08:46:03Z
dc.date.available 2008-12-17T08:46:03Z
dc.date.issued 2008-12-17
dc.identifier.citation Habbal , S R , Woo , R & Morgan , H 2008 , ' The Depiction of Coronal Structure in White-Light Images ' ' , pp. 263-272 . en
dc.identifier.other PURE: 98798
dc.identifier.other dspace: 2160/1737
dc.identifier.uri http://hdl.handle.net/2160/1737
dc.description Morgan, Huw, Habbal, S.R., Woo, R., (2006) 'The Depiction of Coronal Structure in White-Light Images', Solar Physics 236(2) pp.263-272 en
dc.description.abstract The very steep decrease in density with heliocentric distance makes imaging of coronal density structures out to a few solar radii challenging. The radial gradient in brightness can be reduced using numerous image processing techniques, thus quantitative data are manipulated to provide qualitative images. We introduce a new normalizing-radial-graded filter (NRGF): a simple filter for removing the radial gradient to reveal coronal structure. Applied to polarized brightness observations of the corona, the NRGF produces images which are striking in their detail. Total-brightness, white-light images include contributions from the F corona, stray light, and other instrumental contributions which need to be removed as effectively as possible to properly reveal the electron corona structure. A new procedure for subtracting this background from LASCO C2 white-light, total-brightness images is introduced. The background is created from the unpolarized component of total-brightness images and is found to be remarkably time-invariant, remaining virtually unchanged over the solar cycle. By direct comparison with polarized-brightness data, we show that the new background-subtracting procedure is superior in depicting coronal structure accurately, particularly when used in conjunction with the NRGF. The effectiveness of the procedures is demonstrated on a series of LASCO C2 observations of a coronal mass ejection (CME). en
dc.format.extent 10 en
dc.language.iso eng
dc.relation.ispartof ' en
dc.title The Depiction of Coronal Structure in White-Light Images en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.contributor.institution Institute of Mathematics & Physics (ADT) en
dc.description.status Peer reviewed en


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