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Excitation and evolution of vertically polarised transverse loop oscillations by coronal rain
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Verwichte, E. (Erwin) and Kohutova, Petra (2017) Excitation and evolution of vertically polarised transverse loop oscillations by coronal rain. Astronomy and Astrophysics, 601 . L2. ISSN 0004-6361.
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WRAP-excitation-evolution-vertically-polarised-transverse-loop-Verwichte-2017.pdf - Accepted Version - Requires a PDF viewer. Download (777Kb) | Preview |
Official URL: https://doi.org/10.1051/0004-6361/201730675
Abstract
Context. Coronal rain is composed of cool dense blobs that form in solar coronal loops and are a manifestation of catastrophic cooling linked to thermal instability. The nature and excitation of oscillations associated with coronal rain is not well understood. Aims. We consider observations of coronal rain in a bid to elucidate the excitation mechanism and evolution of wave characteristics. Methods. We analyse IRIS and Hinode/SOT observations of an oscillating coronal rain event on 17 Aug 2014 and determine the wave characteristics as a function of time using tried and tested time-space analysis techniques. Results. We exploit the seismological capability of the oscillation to deduce the relative rain mass from the oscillation amplitude. This is consistent with the evolution of the oscillation period showing the loop loosing a third of its mass due to falling coronal rain in a 10-15 minute time period. Conclusions. We present first evidence of the excitation of vertically polarised transverse loop oscillations triggered by a catastrophic cooling at the loop top and consistent with two thirds of the loop mass comprising of cool rain mass.
Item Type: | Journal Article | ||||||
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Subjects: | Q Science > QB Astronomy | ||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
Library of Congress Subject Headings (LCSH): | Sun -- Loop prominences | ||||||
Journal or Publication Title: | Astronomy and Astrophysics | ||||||
Publisher: | EDP Sciences | ||||||
ISSN: | 0004-6361 | ||||||
Official Date: | 21 April 2017 | ||||||
Dates: |
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Volume: | 601 | ||||||
Article Number: | L2 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||
Date of first compliant deposit: | 5 April 2017 | ||||||
Date of first compliant Open Access: | 11 August 2017 | ||||||
Funder: | Science and Technology Facilities Council (Great Britain) (STFC), United States. National Aeronautics and Space Administration (NASA), Norsk Romsenter [Norwegian Space Centre], Uchū Kagaku Kenkyūjo (Japan) | ||||||
Grant number: | ST/L000733/I (STFC) |
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