THE LIFETIME OF H-ALPHA STRUCTURES IN ACTIVE REGIONS ON THE SUN,

Abstract

Time series of exposures of active regions on the sun were obtained at the Solar Observatory, Harestua, with a Zeiss Coude refractor (D=15 cm) and a Lyot monochromator with a passband halfwidth of 0.65 A. By a graphic method the mean lifetime of 574 fibrills on 81 selected negatives was determined to be 4 hours. This value may be as much as 20 percent too high, as shown by a discussion of the uncertainties of the method. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1967
Accession Number
AD0819176

Entities

People

  • Odd Gimse

Organizations

  • University of Oslo

Tags

DTIC Thesaurus Topics

  • Astronomical Observatories
  • Buildings And Structures
  • Monochromators
  • Observatories
  • Solar Observatories
  • Uncertainty

Readers

  • Geodesy
  • Solar Physics