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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

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
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
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.
0992-7689
263-273
Davis, C.J.
854f0b17-697b-476a-92dd-7986346c6880
Clarke, E.M.
8d0e22d3-ad18-4420-8629-fd3423655dcf
Bamford, R.A.
ad24338e-f496-4637-ac53-998e9212ac26
Lockwood, M.
32917473-f7d9-4773-9162-6509baad09fa
Bell, S.A.
87fb5f29-6631-4d43-83c4-e8b624e101b5
Davis, C.J.
854f0b17-697b-476a-92dd-7986346c6880
Clarke, E.M.
8d0e22d3-ad18-4420-8629-fd3423655dcf
Bamford, R.A.
ad24338e-f496-4637-ac53-998e9212ac26
Lockwood, M.
32917473-f7d9-4773-9162-6509baad09fa
Bell, S.A.
87fb5f29-6631-4d43-83c4-e8b624e101b5

Davis, C.J., Clarke, E.M., Bamford, R.A., Lockwood, M. and Bell, S.A. (2001) 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. Annales Geophysicae, 19, 263-273.

Record type: Article

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.

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Published date: 2001

Identifiers

Local EPrints ID: 9153
URI: http://eprints.soton.ac.uk/id/eprint/9153
ISSN: 0992-7689
PURE UUID: 1d175106-d4d3-48f9-b4d5-98dd786cdc2b

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Date deposited: 24 Sep 2004
Last modified: 07 Jan 2022 21:58

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Contributors

Author: C.J. Davis
Author: E.M. Clarke
Author: R.A. Bamford
Author: M. Lockwood
Author: S.A. Bell

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