Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/5644
Title: Preliminary results on irradiance measurements from LYRA and SWAP
Authors: Kumara, S. T
Kariyappa, R
Dominique, M
David, B
Dame, L
Hochedez, J. F
Doiddamani, V. H
Pradeep Chitta, L
Issue Date: Jan-2012
Publisher: Hindawi Publishing Corporation
Citation: Advances in Astronomy, Vol. 2012, Article ID 623709
Abstract: The rst and preiminary results of the photometry of Large Yield Radiometer (LYRA) and Sun Watcher using Active Pixel system detector and Image Processing (SWAP) onboard PROBA2 are presented in this paper. To study the day-to-day variations of LYRA irradiance, we have compared the LYRA irradiance values (observed Sun as a Star) measured in Aluminum lter channel (171 A - 500 A) with spatially resolved full disk integrated intensity values measured with SWAP (174 A) and Ca ii K 1 A index values (ground based observations from NSO/Sac Peak) for the period from 01 April 2010 to 15 Mar 2011. We found that there is a good correlation between these parameters. This indicates that the spatial resolution of SWAP complements the high temporal resolution of LYRA. Hence SWAP can be considered as an additional radiometric channel. Also the K emission index is the integrated intensity (or ux) over a 1 A band centered on the K line and is proportional to the total emission from the chromosphere, this comparison clearly explains the LYRA irradiance variations are due to the various magnetic features, which are contributing signi cantly. In addition to this we have made an attempt to segregate coronal features from full-disk SWAP images. This will help to understand and determine the actual contribution of the individual coronal feature to LYRA irradiance variations.
Description: This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
URI: http://hdl.handle.net/2248/5644
Appears in Collections:IIAP Publications

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