Equatorial coronal holes from observations in the He I λ 1083 nm line wings

Details Equatorial coronal holes from observations in the He I λ 1083 nm line wings Equatorial coronal holes from observations in the He I λ 1083 nm line wings

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000kfnt...16..316b&link_type=abstract

Kinematika i Fizika Nebesnykh Tel, vol. 16, no. 4, p. 316-323

Physics

2

Scientific paper

Average intensities in the blue and red wings of the He I λ1083 nm line we determined for some areas equatorial coronal holes (CH) and unipolar quiet regions from the solar CCD images taken at ±0.05 nm from the line centre in 1995 and 1999. These data were used to estimate the average Doppler line shift caused by the presence of outflows from CH (Δ λh) and unipolar quit regions (Δλq). We obtained Δλh = -0.0032 nm (σm = 0.0002); for 105 CH areas and Δλq
= 0.0012 nm (σm = 0.0002) for 41 unipolar quiet regions. This result is indicative of a significant difference between CH and quiet regions in the average outflow velocity, which means that the solar wind from CH begins to accelerate from the middle chromosphere. Taking into account the existense in CH of fine structure elemets with a radial outflow velocity of 8 km/s, we found that these elements cover about 10 percent of the CH area. We note that |Δλh| tends to increase near the solar activity maximum.

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