Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998arep...42..819s&link_type=abstract
Astronomy Reports, Volume 42, Issue 6, November 1998, pp.819-826
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Based on He I 10 830 Angstrom triplet observations, we determined the physical parameters of the solar chromosphere: thermal and turbulent velocities, excitation temperature, effective kinetic temperature, and number of He atoms at the 23S level. An analysis of spatial variations in these parameters provides new information about thin magnetic flux tubes filling the chromosphere. The observed dependence of filling factor on the depth of the main component in the He I 10 830 Angstrom triplet, on heliocentric angle, and on effective temperature lends support to the following model. A partially ionized plasma rises from the photosphere along each magnetic flux tube to the upper chromosphere. Here, the outflow of neutral atoms across magnetic field lines leads to an ion- neutral separation. The neutrals fill a more extended region -- a `cloud' near the upper part of the flux tube. In active regions, we observe the overlapping of He I clouds in the upper chromosphere.
Kozlova L. M.
Somov Boris V.
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