Abstract
Observations are described of diffuse material in and around the chromospheric network which lowers the intensity there in the core of Hα, and is detected best at Hα ± 0.5 Å.
This material seems to be responsible for the Hα central reversal in spicules, has typically N e ≈ 3 × × 1010 cm−3 and T e ≲ 3 × 104 K, and is probably related to the network seen in rocket spectroheliograms. It is confined mainly within a height of 3500 km and has a typical lateral extent of about 15000 km.
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Giovanelli, R.G. A diffuse component in the Hα chromospheric network. Sol Phys 38, 117–125 (1974). https://doi.org/10.1007/BF00161829
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DOI: https://doi.org/10.1007/BF00161829