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12. On the Nature of Fine Structure of Active Regions on the Sun
1960
Transactions of the International Astronomical Union
J O I N T D I S C U S S I O N 2 x io 13 cm -2 . Assuming H* to be io 8 cm, the scale height of the chromosphere, we get « 8 «2 x io 5 cm -3 , and hence w e w«/ w 8~5 x io 20 . However, for a wide range of temperature, i.e. for T = 5ooo° and 15,000°, we have «"« ( /K 8 = 8 X I O 1 8 and 6xio 1 9 . On the average there is a discrepancy of the order of 1/20. In order that this ratio should take plausible values, one would have to assume a very small thickness for the flare of the order of 50 km,
doi:10.1017/s0251107x0002126x
fatcat:sknjfy4qrzanxcrl7slfqanrk4