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Temperature Response of the 171 Å Passband of the SWAP Imager on PROBA2, with a Comparison to TRACE, SOHO, STEREO, and SDO

  • PROBA2 – First Two Years of Solar Observation
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Abstract

We calculated the temperature response of the 171 Å passbands of the Sun Watcher using APS detectors and image Processing (SWAP) instrument onboard the PRoject for OnBoard Autonomy 2 (PROBA2) satellite. These results were compared to the temperature responses of the Extreme Ultraviolet Imaging Telescope (EIT) onboard the Solar and Heliospheric Observatory (SOHO), the Transition Region and Coronal Explorer (TRACE), the twin Extreme Ultraviolet Imagers (EUVI) onboard the Solar TErrestrial RElations Observatory (STEREO) A and B spacecraft, and the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO). Multiplying the wavelength-response functions for each instrument by a series of isothermal synthetic spectra and integrating over the range 165 – 195 Å produced temperature-response functions for the six instruments. Each temperature response was then multiplied by sample differential emission-measure functions for four different solar conditions. For any given plasma condition (e.g. quiet Sun, active region), it was found that the overall variation with temperature agreed remarkably well across the six instruments, although the wavelength responses for each instrument have some distinctly different features. Deviations were observed, however, when we compared the response of any one instrument to different solar conditions, particularly for the case of solar flares.

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Acknowledgements

This work was supported by an ESA/PRODEX grant administered by Enterprise Ireland. CLR is supported in part by NASA contract NAS5-98033. DSB is supported by the European Community (FP7) under a Marie Curie Intra-European Fellowship for Career Development. Support for DBS came from PRODEX grant no. C90345 managed by the European Space Agency in collaboration with the Belgian Federal Science Policy Office (BELSPO) in support of the PROBA2/SWAP mission, and from the European Commission’s Seventh Framework Programme (FP7/ 2007-2013) under the grant agreement no. 218816 (SOTERIA project, www.soteria-space.eu ). SWAP is a project of the Centre Spatial de Liège and the Royal Observatory of Belgium funded by the Belgian Federal Science Policy Office (BELSPO). The authors would like to sincerely thank the referee for informative and helpful remarks and assistance in improving this publication.

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Authors and Affiliations

  1. Space Sciences Laboratory, UC Berkeley, 7 Gauss Way, Berkeley, CA, 94720, USA

    Claire L. Raftery

  2. Astrophysics Research Group, School of Physics, Trinity College Dublin, Dublin 2, Ireland

    Claire L. Raftery, D. Shaun Bloomfield & Peter T. Gallagher

  3. Solar Physics, Royal Observatory of Belgium, Ringlaan 3, 1180, Brussels, Belgium

    Daniel B. Seaton, David Berghmans & Anik De Groof

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  1. Claire L. Raftery
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Correspondence to Claire L. Raftery.

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PROBA2 – First Two Years of Solar Observation

Guest Editors: David Berghmans, Anik De Groof, Marie Dominique, and Jean-François Hochedez

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Raftery, C.L., Bloomfield, D.S., Gallagher, P.T. et al. Temperature Response of the 171 Å Passband of the SWAP Imager on PROBA2, with a Comparison to TRACE, SOHO, STEREO, and SDO. Sol Phys 286, 111–124 (2013). https://doi.org/10.1007/s11207-013-0266-z

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