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Seismological demonstration of perpendicular density structuring in the solar corona

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Van Doorsselaere, Tom, Brady, Christopher S., Verwichte, E. (Erwin) and Nakariakov, Valery M.. (2008) Seismological demonstration of perpendicular density structuring in the solar corona. Astronomy & Astrophysics, Vol.491 (No.2). L9-L12. ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361:200810659

Abstract

The peculiarities of the propagating transverse waves observed in the solar corona with the CoronalMulti-channel Polarimeter (CoMP)indicate the existence of fine field structuring in the coronal density. We present results of numerical simulations studying the evolution of a localised transverse magneto-hydrodynamic wave in a uniform magnetic field. We consider two initial low plasma-beta equilibria: one with a homogeneous density, and one with a field-aligned dense structure (such as a loop or a plume). The perpendicular localisation of the wave strongly determines the angular distribution of the energy propagation. If the perpendicular scale of the wave is significantly smaller than the parallel scale (e.g. wavelength), as established by CoMP, the wave develops as an oblique fast magneto-acoustic wave. In an unstructured medium, the energy of such a wave is transferred mainly across the magnetic field. However, it is possible to channel the energy of the transverse wave along the magnetic field in the presence of a field-aligned density enhancement. We conclude that the CoMP results provide an independent seismological proof that the corona is structured in density in the perpendicular direction.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Sun -- Corona -- Magnetic fields -- Mathematical models, Magnetohydrodynamic waves -- Mathematical models, Solar oscillations
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	E D P Sciences
ISSN:	0004-6361
Date:	November 2008
Volume:	Vol.491
Number:	No.2
Page Range:	L9-L12
Identification Number:	10.1051/0004-6361:200810659
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Seventh Framework Programme (European Commission) (FP7), Science and Technology Facilities Council (Great Britain) (STFC)
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URI:	http://wrap.warwick.ac.uk/id/eprint/3438