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Spicules are Bright and Dark

Published online by Cambridge University Press:  14 August 2015

Harold Zirin
Harold Zirin*
Affiliation:
Big Bear Solar Observatory, Hale Observatories, Carnegie Institution of Washington, California Institute of Technology, Pasadena, Calif, U.S.A.

Abstract

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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 Ca II 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.

Type
Part II: The Quiet Chromosphere: Disk Phenomena
Information
Symposium - International Astronomical Union , Volume 56: Chromospheric Fine Structure , 1974 , pp. 49 - 50
Copyright
Copyright © Reidel 1974