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Spicules are Bright and Dark

Zirin, Harold (1974) Spicules are Bright and Dark. In: Chromospheric Fine Structure. International Astronomical Union Symposium (IAUS). No.56. Springer Netherlands , Dordrecht, pp. 49-50. ISBN 9789027702883.

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I have tried to understand whether spicules appear dark or bright against the disk in Hα by comparing high resolution pictures in Hα and Caii K. Since the chromospheric structure is more apparent near active regions, I have first compared the Hα and K fibrils near an active sunspot; these are illustrated in my review paper (this Symposium, p. 161). The elongated fibrils in the active center appear similar to spicules, but much larger and more horizontal. K line pictures show bright features better, while Hα shows dark features better.

Item Type:Book Section
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Additional Information:© International Astronomical Union 1974.
Subject Keywords:Active Region; Foreground Object; Solar Observatory; Active Sunspot; Quiet Region
Series Name:International Astronomical Union Symposium (IAUS)
Issue or Number:56
Record Number:CaltechAUTHORS:20201009-102843612
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105957
Deposited By: George Porter
Deposited On:09 Oct 2020 22:13
Last Modified:16 Nov 2021 18:48

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