Other
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002an....323..123h&link_type=abstract
Astronomische Nachrichten, vol. 323, no. 2, p. 123-128
Other
2
Scientific paper
UARS SOLSTICE data have been subjected to Fourier and wavelet analyses in order to search for the signature of the solar rotation law in the disk-integrated irradiance of UV lines. Lyman-alpha, Mg II, and Ca II data show a different behaviour. In the SOLSTICE data there are significant temporal variations of the rotation rate of the UV tracers over 5 - 6 years. Often several distinct rotation periods appear almost simultaneously. Beside the basic period around 27 days there are signals at 32 - 35 days corresponding to the rotation rate at very high latitudes. For more than 5 years during another period of the solar cycle the rotational behaviour is quite different; there is an indication of differential rotation of active regions in these Ca II ground-based data. The data contain a wealth of information about the solar differential rotation, but it proves difficult to disentangle the effects of the different emitting sources.
Hasler K. H.
Rudiger Günther
Staude Jakob
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