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Evidence for the photospheric excitation of incompressible chromospheric waves

journal contribution
posted on 2013-05-01, 00:00 authored by R J Morton, G Verth, V Fedun, Sergiy ShelyagSergiy Shelyag, R Erdélyi
Observing the excitation mechanisms of incompressible transverse waves is vital for determining how energy propagates through the lower solar atmosphere. We aim to show the connection between convectively driven photospheric flows and incompressible chromospheric waves. The observations presented here show the propagation of incompressible motion through the quiet lower solar atmosphere, from the photosphere to the chromosphere. We determine photospheric flow vectors to search for signatures of vortex motion and compare results to photospheric flows present in convective simulations. Further, we search for the chromospheric response to vortex motions. Evidence is presented that suggests incompressible waves can be excited by the vortex motions of a strong magnetic flux concentration in the photosphere. A chromospheric counterpart to the photospheric vortex motion is also observed, presenting itself as a quasi-periodic torsional motion. Fine-scale, fibril structures that emanate from the chromospheric counterpart support transverse waves that are driven by the observed torsional motion. A new technique for obtaining details of transverse waves from time-distance diagrams is presented and the properties of transverse waves (e.g., amplitudes and periods) excited by the chromospheric torsional motion are measured.

History

Journal

Astrophysical journal

Volume

768

Issue

1

Article number

17

Pagination

1 - 11

Publisher

IOP Publishing

Location

Bristol, Eng.

ISSN

0004-637X

eISSN

1538-4357

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2013, The American Astronomical Society