Density fluctuations in polar coronal holes: Mechanism and observational consequences

Details Density fluctuations in polar coronal holes: Mechanism and observational consequences Density fluctuations in polar coronal holes: Mechanism and observational consequences

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..471..341k&link_type=abstract

The solar wind nine conference. AIP Conference Proceedings, Volume 471, pp. 341-344 (1999).

Computer Science

1

Scientific paper

Recent Ultraviolet Coronagraph spectrometer observations (UVCS) indicate quasi-periodic variations in the polarized brightness in polar coronal holes. The importance of these observations arises from the fact that these fluctuations might be the signature of compressional waves at heliocentric distances of about 2 Rsolar. Such observations are a clear indication that some kind of mechanism or mechanisms operate near the Sun transforming Alfvén waves into compressible magnetosonic waves. In the present paper we investigate, whether a linear wave conversion of Alfvén waves induced by velocity shear can explain the observations.

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