Differential Rotation Velocity in the Photospheric Layer Determined by Doppler Method and Ray Tracing Method

Details Differential Rotation Velocity in the Photospheric Layer Determined by Doppler Method and Ray Tracing Method Differential Rotation Velocity in the Photospheric Layer Determined by Doppler Method and Ray Tracing Method

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999lapa....1....1k&link_type=abstract

Warta LAPAN, vol. 1, p. 1

Physics

Photosphere, Plasmas (Physics), Sunspots, Solar Physics, Solar Rotation, Doppler Radar, Satellite Doppler Positioning, Ray Tracing, Tracking (Position), Angular Momentum, Magnetic Fields

Scientific paper

The differential rotation velocity in the photospheric layer can be determined by two different ways: Doppler shift method (plasma rotation measurement) and from the tracing of solar features (mostly sunspots). Solar rotation as measured by Doppler shift method was 7% slower than that measured by sunspot proper motion technique. This difference may be partly caused by the difference in the measuring techniques, but in general it was believed that this reflects the difference in physical conditions between photospheric (non-magnetic) plasma and sunspots. The movement of sunspots as the tracing still controlled by magnetic field from convective zone, under photosphere layer. Because of that sunspot rotation not exactly to explain the rotation of photosphere layer like Doppler shift method. These physical condition differences will be tray to solve by the total angular momentum derived from Doppler shift method and Tracing method rotation curves.

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