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Collisional dissipation of Alfvén waves in a partially ionised solar chromosphere
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Leake, J. E. (James E.), Arber, T. D. and Khodachenko, M. L.. (2005) Collisional dissipation of Alfvén waves in a partially ionised solar chromosphere. Astronomy & Astrophysics, Vol.442 (No.3). pp. 1091-1098. ISSN 0004-6361
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Official URL: http://dx.doi.org/10.1051/0004-6361:20053427
Abstract
Certain regions of the solar atmosphere are at sufficiently low temperatures to be only partially ionised. The lower chromosphere contains neutral atoms, the existence of which greatly increases the efficiency of the damping of waves due to collisional friction momentum transfer. More specifically the Cowling conductivity can be up to 12 orders of magnitude smaller than the Spitzer value, so that the main damping mechanism in this region is due to the collisions between neutrals and positive ions (Khodachenko et al. 2004, A&A, 422, 1073). Using values for the gas density and temperature as functions of height taken from the VAL C model of the quiet Sun (Vernazza et al. 1981, ApJS, 45, 635), an estimate is made for the dependance of the Cowling conductivity on height and strength of magnetic field. Using both analytic and numerical approaches the passage of Alfvén waves over a wide spectrum through this partially ionised region is investigated. Estimates of the efficiency of this region in the damping of Alfvén waves are made and compared for both approaches. We find that Alfvén waves with frequencies above 0.6 Hz are completely damped and frequencies below 0.01 Hz unaffected.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QB Astronomy |
| Divisions: | Faculty of Science > Physics |
| Library of Congress Subject Headings (LCSH): | Solar chromosphere, Solar magnetic fields, Magnetohydrodynamic waves |
| Journal or Publication Title: | Astronomy & Astrophysics |
| Publisher: | EDP Sciences |
| ISSN: | 0004-6361 |
| Date: | November 2005 |
| Volume: | Vol.442 |
| Number: | No.3 |
| Page Range: | pp. 1091-1098 |
| Identification Number: | 10.1051/0004-6361:20053427 |
| Status: | Peer Reviewed |
| Access rights to Published version: | Open Access |
| Funder: | Particle Physics and Astronomy Research Council (Great Britain) (PPARC), British Council (Austria), Fonds zur Förderung der Wissenschaftlichen Forschung (Austria) (FWF), Rossiĭskiĭ fond fundamentalʼnykh issledovaniĭ [Russian Foundation for Basic Research] (RFFI) |
| Grant number: | PPA/S/S/2003/03728 (PPARC), P16919-N08 (FWF), I.21/04 (RFFI) |
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| URI: | http://wrap.warwick.ac.uk/id/eprint/3582 |
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