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Coronal waves in coronal loops during non-flare stage

Published online by Cambridge University Press:  01 September 2008

Dmitry Prosovetsky
Dmitry Prosovetsky*
Affiliation:
The Institute of solar-terrestrial physics, Lermontov st., 126a, p/o box 291, Irkutsk, 664033, Russia email: proso@iszf.irk.ru
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Abstract

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Using SOHO/EIT Fe XII λ195 Å observations the new type of oscillations in coronal loops was detected. The oscillation corresponds to wave propagated to outer area of atmosphere of active area. As opposed to most kind of oscillations associated with coronal loops the waves are observed at non-flare stage of active areas evolution. Velocities of the wave propagation were 8-20 km s−1 and had quasi-perpendicular direction with magnetic field. Such waves were detected in active areas located on solar disk and loops structures outside solar limb. Investigation of EIT data shows the waves are not result of changes of topology of a magnetic field and loops configuration. The nature and probable sources of waves are discussed.

Keywords

Sun: activityUV radiationoscillations
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S257: Universal Heliophysical Processes , September 2008 , pp. 245 - 249
Copyright
Copyright © International Astronomical Union 2009

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