Evidence for the photospheric excitation of incompressible chromospheric waves

Morton, Richard, Verth, Gary, Fedun, Viktor and Shelyag, Sergiy (2013) Evidence for the photospheric excitation of incompressible chromospheric waves. The Astronomical Journal, 768 (1). p. 17. ISSN 0004-6256

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Official URL: http://dx.doi.org/10.1088/0004-637X/768/1/17

Abstract

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.

Item Type: Article
Uncontrolled Keywords: magnetohydrodynamics (MHD), Sun: chromosphere, Sun: photosphere, waves
Subjects: F300 Physics
F500 Astronomy
G100 Mathematics
Department: Faculties > Engineering and Environment > Mathematics and Information Sciences
Related URLs:
Depositing User: Richard Morton
Date Deposited: 02 May 2013 12:20
Last Modified: 13 May 2017 11:42
URI: http://nrl.northumbria.ac.uk/id/eprint/12442

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