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Excitation and Evolution of Transverse Loop Oscillations by Coronal Rain

Published online by Cambridge University Press:  24 July 2018

Erwin Verwichte Open the ORCID record for Erwin Verwichte [Opens in a new window] ,
Petra Kohutova Open the ORCID record for Petra Kohutova [Opens in a new window] ,
Patrick Antolin Open the ORCID record for Patrick Antolin [Opens in a new window] ,
George Rowlands  and
Thomas Neukirch Open the ORCID record for Thomas Neukirch [Opens in a new window]
Erwin Verwichte
Affiliation:
Department of Physics, University of Warwick, Coventry, UK email: [email protected]
Petra Kohutova
Affiliation:
Department of Physics, University of Warwick, Coventry, UK email: [email protected]
Patrick Antolin
Affiliation:
School of Mathematics & Statistics, University of St Andrews, St Andrews, UK
George Rowlands
Affiliation:
Department of Physics, University of Warwick, Coventry, UK email: [email protected]
Thomas Neukirch
Affiliation:
School of Mathematics & Statistics, University of St Andrews, St Andrews, UK
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Abstract

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We present evidence of the excitation of vertically polarised transverse loop oscillations triggered by a catastrophic cooling of a coronal loop with two thirds of the loop mass comprising of cool rain mass. The nature and excitation of oscillations associated with coronal rain is not well understood. We consider observations of coronal rain using data from IRIS, SOT/Hinode and AIA/SDO in a bid to elucidate the excitation mechanism and evolution of wave characteristics. We apply an analytical model of wave-rain interaction, that predicts the inertial excitation amplitude of transverse loop oscillations as a function of the rain mass, to deduce the relative rain mass. It is consistent with the evolution of the oscillation period showing the loop losing a third of its mass due to falling coronal rain in a 10-15 minute time period.

Keywords

(magnetohydrodynamics:) MHDSun: atmosphereSun: oscillations
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S335: Space Weather of the Heliosphere: Processes and Forecasts , July 2017 , pp. 36 - 38
Copyright
Copyright © International Astronomical Union 2018 

References

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