Differential rotation rates for short-lived regions of emerging magnetic flux

Details Differential rotation rates for short-lived regions of emerging magnetic flux Differential rotation rates for short-lived regions of emerging magnetic flux

Jan 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...219l..55g&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 219, Jan. 1, 1978, p. L55-L57.

Astronomy and Astrophysics

Astrophysics

17

Magnetic Flux, Solar Magnetic Field, Solar Rotation, Solar X-Rays, Photosphere, Sunspots

Scientific paper

We have measured the synodic rotation rates of a sample of compact X-ray emission features lasting from 1 day to 7 days, thus bridging the transition between X-ray bright points and active regions. The rotation rate is found to be a function of the lifetime, or size, of the feature; shorter-lived smaller features rotate more slowly than long-lived ones. The rotation rate for features lasting 2 days or less is consistent with that of the photospheric gas. The longest-lived features rotate at a rate about 5% higher, consistent with the sunspot rotation rate.

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