long term changes in euv and x-ray emissions from the solar corona and chromosphere as measured by the response of the earth’s ionosphere during total solar eclipses from 1932 to 1999

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ID: 216093
2001
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Abstract
Measurements of the ionospheric E region during total solar eclipses in the period 1932–1999 have been used to investigate the fraction of Extreme Ultra Violet and soft X-ray radiation, 8, that is emitted from the limb corona and chromosphere. The relative apparent sizes of the Moon and the Sun are different for each eclipse, and techniques are presented which correct the measurements and, therefore, allow direct comparisons between different eclipses. The results show that the fraction of ionising radiation emitted by the limb corona has a clear solar cycle variation and that the underlying trend shows this fraction has been increasing since 1932. Data from the SOHO spacecraft are used to study the effects of short-term variability and it is shown that the observed long-term rise in 8 has a negligible probability of being a chance occurrence.

Key words. Ionosphere (solar radiation and cosmic ray effects) – Solar physics, astrophysics, and astronomy (corona and transition region)
Reference Key
davis2001annaleslong Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors C. J. Davis, E. M. Clarke, R. A. Bamford, M. Lockwood, S. A. Bell
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Journal journal of food measurement and characterization
Year 2001
DOI
10.5194/angeo-19-263-2001
URL
https://www.ann-geophys.net/19/263/2001/angeo-19-263-2001.pdf
Keywords
cosmic physics sciencephysicsgeophysics

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