Physics
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998soph..182..333p&link_type=abstract
Solar Physics, v. 182, Issue 2, p. 333-348 (1998).
Physics
48
Scientific paper
Strong evidence has been found from SOHO-CDS (Solar and Heliospheric Observatory - Coronal Diagnostic Spectrometer) observations to support the hypothesis that rotation plays a major role in the dynamics of transition region features. A comprehensive survey of the CDS daily synoptic rasters has been carried out to select dynamic events by searching for spectral line shifts in the Ov emission line at 629.73Å (formed at a temperature of 2.5x105K). Unique CDS observations of a macrospicule were reported by Pike and Harrison (1997), and several more macrospicule-like solar features have now been identified in the polar regions both on the limb and disk. These show blue- and red-shifted emission on either side of an axis stretching above the limb from a footpoint region on the disk. These observations are interpreted as indicating the presence of a rotating plasma, a sort of solar tornado. In the examples studied, the rotation velocities increase with height. The implications for coronal heating models are discussed.
Mason Harris E.
Pike David C.
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