Energy storage in solar loops by footpoint motions

Details Energy storage in solar loops by footpoint motions Energy storage in solar loops by footpoint motions

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...214..369z&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 214, no. 1-2, April 1989, p. 369-374.

Astronomy and Astrophysics

Astrophysics

10

Coronal Loops, Force-Free Magnetic Fields, Magnetic Energy Storage, Sunspots, Angular Velocity, Photosphere, Solar Magnetic Field, Velocity Distribution

Scientific paper

The amount of stored magnetic energy in an arcade, sheared by footpoint motions due to the relative velocity of young and recurrent sunspot groups (RSG), has been evaluated in the force-free-field approximation. The relative velocity (Delta v) between young and RSG and the time scales during which this Delta v lasts have been estimated from the analysis of sunspot data reported in the Greenwich Photoheliograhic Results for the years 1874-1976. Using shearing times from 86,000-260,000 sec and Delta v of 2940-3470 cm/sec, it is found that the stored energy may be (1-1000) x 10 to the 30th ergs. The consequences of these results, concerning the phase of energy build-up for loop heating and for transients are discussed.

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