On a source of Alfven waves heating the solar corona

Details On a source of Alfven waves heating the solar corona On a source of Alfven waves heating the solar corona

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...337l...9r&link_type=abstract

Astronomy and Astrophysics, v.337, p.L9-L12 (1998)

Astronomy and Astrophysics

Astrophysics

30

Solar Corona Heating: Magnetic Fields

Scientific paper

Studies of the origin of coronal heating and acceleration of the solar wind invoke high-frequency Alfv{e}n waves. Here we suggest a source for such waves associated with twisted magnetic loops emerging on the solar surface and reconnecting with the open field. We identify the loops with the ephemeral regions (small-scale bipoles) observed by ground-based instruments and by SOHO. To characterize the loops we employ the concept of a minimum energy state for topologically complex fields. Emerging loops release energy relaxing to the minimum state. Relaxation along the minimum state-due to a competition between footpoint twisting by photospheric motions and reconnections inside the loops- releases blinks of energy into the solar atmosphere. We estimate the power released and the range of wave frequencies.

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