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Session 80 - Solar Corona and Transition Region.
Oral session, Thursday, June 13
Wisconsin Center,

[80.06] White Light Coronal Rotation Characteristics: 1984-1995

D. M. Hassler (HAO/NCAR), S. Tomczyk (HAO/NCAR)

Time series of white light polarized brightness (pB) data from the HAO MkIII K-coronameter at Mauna Loa, Hawaii have been analyzed by direct Fourier analysis to study variations in the coronal rotation rate as a function of height, latitude, and time in the solar cycle. Short time series (ranging from 1-4 years) provide the ability to resolve or discriminate variations in the rotation rate at different times in the solar cycle while longer time series (i.e. 12 years) provide maximum signal-to-noise to study variations of rotation rate with height in the corona. Results suggest evidence of variations of the rotation rate with latitude and height, with more differential rotation and slightly faster mean rotation rates present at lower heights in the corona. Results also suggest variations of differential rotation and mean rotation rate with time in the solar cycle with slightly faster rotation rates during solar minimum.

Program listing for Thursday