LASCO observations of the coronal rotation

Details LASCO observations of the coronal rotation LASCO observations of the coronal rotation

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999soph..184..297l&link_type=abstract

Solar Physics, v. 184, Issue 2, p. 297-315 (1999).

Physics

20

Scientific paper

The near-rigid rotation of the corona above the differential rotation of the photosphere has important implications for the form of the global coronal magnetic field. The magnetic reconfiguring associated with the shear region where the rigidly-rotating coronal field lines interface with the differentially-rotating photospheric field lines could provide an important energy source for coronal heating. We present data on coronal rotation as a function of altitude provided by the Large Angle Spectrometric Coronagraph (LASCO) instrument aboard the Solar and Heliospheric Observatory (SOHO) spacecraft. LASCO comprises of three coronagraphs (C1, C2, and C3) with nested fields-of-view spanning 1.1Rsolar to 30Rsolar. An asymmetry in brightness, both of the Fexiv emission line corona and of the broad-band electron scattered corona, has been observed to be stable over at least a one-year period spanning May1996 to May1997. This feature has presented a tracer for the coronal rotation and allowed period estimates to be made to beyond 15Rsolar, up to 5times further than previously recorded for the white-light corona. The difficulty in determining the extent of differential motion in the outer corona is demonstrated and latitudinally averaged rates formed and determined as a function of distance from the Sun. The altitude extent of the low latitude closed coronal field region is inferred from the determined rotation periods which is important to the ability of the solar atmosphere to retain energetic particles. For the inner green line corona (<2Rsolar) we determine a synodic rotation period of (27.4+/-0.1)days, whereas, for the outer white- light corona, (>2.5Rsolar) we determine a rotation period of (27.7+/-0.1)days.

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