Observation of He I 10830 dark points

Details Observation of He I 10830 dark points Observation of He I 10830 dark points

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997cha%26a..21r.128l&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 21, Issue 1, p. 128-128.

Astronomy and Astrophysics

Astrophysics

Scientific paper

On a batch of 2-dimensional He I 10830 spectra of polar areas of the sun obtained with our imaging spectrograph, ``dark points'' were recorded. The velocities of the dark points were directly measured for the first time, we believe. On our spectroheliograms of 1995-05-08, dark structures (10%-20% in absorption) exist on a scale of 10''-20''. Their morphology and intensity varied on a time scale of 40 min, the intensity varying by 30%-100%. From off-band (+/-0.14Å) images the dark points were found to have blueshift between 5-17 km/s. No corresponding features are seen in the simultaneously observed continuum. In some localized areas, the He I 10830 is less and the chromospheric network, lees clear, indicating the presence of coronal holes.

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