Rotational Signature of Disk Spicules in H-alpha

Details Rotational Signature of Disk Spicules in H-alpha Rotational Signature of Disk Spicules in H-alpha

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp41b09l&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SP41B-09

Astronomy and Astrophysics

Astrophysics

7500 Solar Physics, Astrophysics, And Astronomy, 7507 Chromosphere

Scientific paper

The Littrow spectrograph at Big Bear Solar Observatory (BBSO) can produce a 4-dimensional data array, the intensity as a function of position, wavelength and time. A week long observation at BBSO was carried out on August 25-30, 1997. The spectral scan data is unique in the sense that Doppler maps can be constructed free from mis-alignment problems. We selected the best data set obtained on August 26 for the present study. A number of disk spicules were identified and analysed by considering their Doppler map and time evolution at different wavelengths. It is estimated that 1/3 of the chosen disk spicules are found to display rotational signature. The result is the first clearest demonstration of spicule rotation. The cloud model of Beckers' was used to determine a lower bound for the angular velocity.

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