CORONAL RESPONSE TO AN EUV WAVE FROM DEM ANALYSIS

Vanninathan, K.; Veronig, A. M.; Dissauer, K.; Madjarska, M. S.; Hannah, I. G.

doi:10.1088/0004-637X/812/2/173

Title: CORONAL RESPONSE TO AN EUV WAVE FROM DEM ANALYSIS

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Abstract

Extreme-Ultraviolet (EUV) waves are globally propagating disturbances that have been observed since the era of the Solar and Heliospheric Observatory/Exteme-ultraviolet Imaging Telescope instrument. Although the kinematics of the wave front and secondary wave components have been widely studied, there is not much known about the generation and plasma properties of the wave. In this paper we discuss the effect of an EUV wave on the local plasma as it passes through the corona. We studied the EUV wave, generated during the 2011 February 15 X-class flare/coronal mass ejection event, using Differential Emission Measure diagnostics. We analyzed regions on the path of the EUV wave and investigated the local density and temperature changes. From our study we have quantitatively confirmed previous results that during wave passage the plasma visible in the Atmospheric Imaging Assembly (AIA) 171 Å channel is getting heated to higher temperatures corresponding to AIA 193 and 211 Å channels. We have calculated an increase of 6%–9% in density and 5%–6% in temperature during the passage of the EUV wave. We have compared the variation in temperature with the adiabatic relationship and have quantitatively demonstrated the phenomenon of heating due to adiabatic compression at the wave front. However, themore »« less

Authors:

Vanninathan, K.; Veronig, A. M.; Dissauer, K. ^[1]; Madjarska, M. S. ^[2]; Hannah, I. G.

IGAM/Institute of Physics, University of Graz, A-8010 Graz (Austria)
Armagh Observatory, College Hill, Armagh BT61 9DG (United Kingdom)

Publication Date:: Tue Oct 20 00:00:00 EDT 2015

OSTI Identifier:: 22518735

Resource Type:: Journal Article

Journal Name:: Astrophysical Journal

Additional Journal Information:: Journal Volume: 812; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X

Country of Publication:: United States

Language:: English

Subject:: 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPARATIVE EVALUATIONS; DENSITY; EXTREME ULTRAVIOLET RADIATION; HEATING; HELIOSPHERE; MASS; PLASMA; RELAXATION; SOLAR CORONA; SUN; TELESCOPES; VARIATIONS; WAVE PROPAGATION

Citation Formats


                    Vanninathan, K., Veronig, A. M., Dissauer, K., Madjarska, M. S., Hannah, I. G., and Kontar, E. P., E-mail: kamalam.vanninathan@uni-graz.at. CORONAL RESPONSE TO AN EUV WAVE FROM DEM ANALYSIS.  United States: N. p., 2015. 
        Web.  doi:10.1088/0004-637X/812/2/173.

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                    Vanninathan, K., Veronig, A. M., Dissauer, K., Madjarska, M. S., Hannah, I. G., & Kontar, E. P., E-mail: kamalam.vanninathan@uni-graz.at. CORONAL RESPONSE TO AN EUV WAVE FROM DEM ANALYSIS.  United States.  https://doi.org/10.1088/0004-637X/812/2/173

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                    Vanninathan, K., Veronig, A. M., Dissauer, K., Madjarska, M. S., Hannah, I. G., and Kontar, E. P., E-mail: kamalam.vanninathan@uni-graz.at. 2015.  
        "CORONAL RESPONSE TO AN EUV WAVE FROM DEM ANALYSIS".  United States.  https://doi.org/10.1088/0004-637X/812/2/173.

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@article{osti_22518735,

  title        = {CORONAL RESPONSE TO AN EUV WAVE FROM DEM ANALYSIS},

  author       = {Vanninathan, K. and Veronig, A. M. and Dissauer, K. and Madjarska, M. S. and Hannah, I. G. and Kontar, E. P., E-mail: kamalam.vanninathan@uni-graz.at},

  abstractNote = {Extreme-Ultraviolet (EUV) waves are globally propagating disturbances that have been observed since the era of the Solar and Heliospheric Observatory/Exteme-ultraviolet Imaging Telescope instrument. Although the kinematics of the wave front and secondary wave components have been widely studied, there is not much known about the generation and plasma properties of the wave. In this paper we discuss the effect of an EUV wave on the local plasma as it passes through the corona. We studied the EUV wave, generated during the 2011 February 15 X-class flare/coronal mass ejection event, using Differential Emission Measure diagnostics. We analyzed regions on the path of the EUV wave and investigated the local density and temperature changes. From our study we have quantitatively confirmed previous results that during wave passage the plasma visible in the Atmospheric Imaging Assembly (AIA) 171 Å channel is getting heated to higher temperatures corresponding to AIA 193 and 211 Å channels. We have calculated an increase of 6%–9% in density and 5%–6% in temperature during the passage of the EUV wave. We have compared the variation in temperature with the adiabatic relationship and have quantitatively demonstrated the phenomenon of heating due to adiabatic compression at the wave front. However, the cooling phase does not follow adiabatic relaxation but shows slow decay indicating slow energy release being triggered by the wave passage. We have also identified that heating is taking place at the front of the wave pulse rather than at the rear. Our results provide support for the case that the event under study here is a compressive fast-mode wave or a shock.},

  doi          = {10.1088/0004-637X/812/2/173},

  url          = {https://www.osti.gov/biblio/22518735},
  journal      = {Astrophysical Journal},

  issn         = {0004-637X},

  number       = 2,

  volume       = 812,

  place        = {United States},

  year         = {Tue Oct 20 00:00:00 EDT 2015},

  month        = {Tue Oct 20 00:00:00 EDT 2015}

}

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https://doi.org/10.1088/0004-637X/812/2/173

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