A Method for Characterizing Rotation Rates in the Soft X-Ray Corona

Details A Method for Characterizing Rotation Rates in the Soft X-Ray Corona A Method for Characterizing Rotation Rates in the Soft X-Ray Corona

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999soph..189..271w&link_type=abstract

Solar Physics, v. 189, Issue 2, p. 271-288 (1999).

Physics

21

Scientific paper

Differential rotation rates of soft X-ray features in the solar corona are quantified by a method of harmonic filtering using the Lomb-Scargle periodogram. This approach leads reasonably to a quantitative discrimination between uncertainty estimates and spectral leakage of the fundamental rotation frequency due to the presence of multiple rotating tracers. Mean rotation rates as a function of latitude and year are calculated for the years 1992-1997 (roughly the declining phase of the last solar activity cycle). The corona is found to have a small but measurable latitudinal gradient in rotation rate. The presence of multiple features places a lower bound of 1-2% on the relative uncertainties with which a `mean' rotation rate can be measured. The results are compared with autocorrelation estimates and found to agree within 1σ.

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