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Properties of the solar chromosphere Hα spicules as observed spectrally

✍ Scribed by V. I. Kulidzanishvili; G. M. Nikolsky

Publisher
Springer
Year
1978
Tongue
English
Weight
334 KB
Volume
59
Category
Article
ISSN
0038-0938

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✦ Synopsis

Time succession of 25 Ha spicules has been studied. The spectra are obtained at a height of 6 arc sec during 21 rain (38 pictures) with the 53 cm Lyot coronagraph. Total intensities W, widths AA and radial velocities Vr are determined (about 650 Ha line profiles). For 14 spicules the sign of V, varies, for the rest the sign variation is absent or it is doubtful. Characterized period of Vr variation is 3-7 rain with a mean amplitude of • km s -1. W and AA also vary with a similar period and mean amplitudes equal to 50% and 30% respectively. AA dependence of W (Figure 1) points to the existence of two spicules groups: group I (70%) characterized by relatively small W and AA (mean values are 0.08 A, and 1.3/~ respectively); group II comprising brighter (W~0.13/~) spicules with wider profiles (AA = 1.6 ~,). Group II may consist of the unresolved, superimposed group I spicules. We believe, that Ha spicules involve formations consisting of separate elements having the temperature of 6000 K and non-thermal velocities of -25 km s -1.

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