Are coronal mass ejections caused by magnetic pumping?

Kuijpers, L. and Fletcher, L. (1996) Are coronal mass ejections caused by magnetic pumping? Solar Physics, 169(2), pp. 415-420. (doi:10.1007/BF00190617)

Kuijpers, L. and Fletcher, L. (1996) Are coronal mass ejections caused by magnetic pumping? Solar Physics, 169(2), pp. 415-420. (doi:10.1007/BF00190617)

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Abstract

Magnetic pumping in the solar corona is revisited. We derive conditions under which magnetic pumping can be the cause of heating of loops rather than of particle acceleration. Candidate sources for such a process are coronal mass ejections (CMEs). Large loops are susceptible to heating primarily of protons by magnetic compressions with periods between 50 and 5000 s, the observed spectrum of the photospheric driver. Efficient heating by pumping occurs since in these large loops the density is low enough that the proton-proton collision time is comparable to the periods of the external compressions. We suggest that CMEs may be pressure-driven explosions of large-beta loops caused by magnetic pumping, in contrast to current-driven ‘flares’ in low-beta environments.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Fletcher, Professor Lyndsay
Authors: Kuijpers, L., and Fletcher, L.
Subjects:Q Science > QB Astronomy
Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Research Group:Astronomy and Astrophysics
Journal Name:Solar Physics
Journal Abbr.:Sol. Phys.
Publisher:Springer
ISSN:0038-0938
ISSN (Online):1573-093X

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