The hydrogen balmer lines and the structure of the quiet solar chromosphere

✍ Scribed by Pierre Mein; Nicole Mein

• Publisher: Springer
• Year: 1975
• Tongue: English
• Weight: 568 KB
• Volume: 40
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00162378

✦ Synopsis

Spectra of Hc~, lift and HO have been taken under good seeing conditions with the vacuum tower telescope of Sacramento Peak Observatory. Intensity curves are given at various wavelengths in these lines to permit further comparison with a tlaeoretical model. Moreover, considering in each case the range of height in which the lines are almost optically thin and using a few approximations, the following results are derived: between 2000 and 6000 km above the limb the average thermal + turbulent velocity of the atoms is found to increase from 20 km s -1 to 30 km s -1 and the mean number of hydrogen atoms per em 3 in level 2 is given by logn2 : 4.5 --0.00056 (z --2000) z being the altitude above the limb in kin. For line profile computations a new interpolation formula is presented; it gives good profiles with a small number of scans, saving microphotometer time.