Chromospheric rotation

Details Chromospheric rotation Chromospheric rotation

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979soph...63...17a&link_type=abstract

Solar Physics, vol. 63, Aug. 1979, p. 17-30. Consiglio Nazionale delle Ricerche

Physics

4

Chromosphere, Solar Rotation, Cross Correlation, Data Processing, Digital Filters, Filtergrams, Particle Size Distribution, Solar Activity, Solar Physics, Solar Spectra

Scientific paper

The dependence of solar rotation on the size of chromospheric rotation tracers is considered. The chromospheric features are divided into two size groups on the basis of analysis of daily Ca II K3 filtergrams obtained over a three-month period. The solar rotation rate is determined separately for the two classes of chromospheric features by means of a cross-correlation technique that directly yields the average daily displacement of tracers due to rotation. It is found that chromospheric features with sizes of 24,000 to 300,000 km and lifetimes exceeding one day exhibit approximately the same differential rotation, that smaller features tend to rotate faster, and that the difference does not exceed 1 percent. It is concluded that different short-lived features, both representative of the quiet chromosphere and associated with solar activity, corotate at chromospheric levels.

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