The University of Southampton
University of Southampton Institutional Repository

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.

Full text not available from this repository.

More information

Published date: 2001

Identifiers

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

Catalogue record

Date deposited: 24 Sep 2004
Last modified: 17 Jul 2017 17:11

Export record

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×