The diurnal, annual and sunspot-cycle variations of ESFm at Huancayo compared with similar variations of spread-F occurrence at other longitudes and latitudes

Bowman, G. G. and Mortimer, I. K. (2009) The diurnal, annual and sunspot-cycle variations of ESFm at Huancayo compared with similar variations of spread-F occurrence at other longitudes and latitudes. Journal of Atmospheric and Solar - Terrestrial Physics, 71 2: 221-227. doi:10.1016/j.jastp.2008.11.016


Author Bowman, G. G.
Mortimer, I. K.
Title The diurnal, annual and sunspot-cycle variations of ESFm at Huancayo compared with similar variations of spread-F occurrence at other longitudes and latitudes
Formatted title
The diurnal, annual and sunspot-cycle variations of ESFm at Huancayo compared with similar variations of spread-F occurrence at other longitudes and latitudes
Journal name Journal of Atmospheric and Solar - Terrestrial Physics   Check publisher's open access policy
ISSN 0021-9169
1364-6826
1879-1824
Publication date 2009-02-01
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.jastp.2008.11.016
Volume 71
Issue 2
Start page 221
End page 227
Total pages 7
Editor J. M. C. Plane
W. Lotko
Place of publication East Park, Kidlington, Oxford, U.K.
Publisher Pergamon
Language eng
Subject C1
970102 Expanding Knowledge in the Physical Sciences
020107 Mesospheric, Ionospheric and Magnetospheric Physics
Formatted abstract
Using the tabulations of spread-F data from ionosonde recordings the diurnal, annual and sunspot-cycle variations of this spread-F occurrence have been investigated for the equatorial station, Huancayo. Both Rz max and Rz min periods have been considered. The analyses suggest that some explanation of these variations can be made by involving two regimes, which have been called Regime A and Regime B. The Regime A is present throughout the night but this distribution is more obvious after midnight. This is because in the post-sunset period Regime B, which is associated with significant height rises, is dominant. The Regime A is the same as for similar distributions in mid-latitudes and is inversely related to sunspot activity. It maximizes in December solstice months. The Regime B is directly related to sunspot activity and maximizes in equinoctial months. Changes associated with the upper atmosphere neutral particle density have been found to be important, particularly for Regime A where an inverse relationship exists. The Regime A Rz min annual distributions reported here for Huancayo have been compared with similar distributions at other longitudes and latitudes.
Keyword F2 layer ionospheric disturbances
Neutral-particle density
Spread-F variations with time
Neutral particle density
Equatorial and other latitudes
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Available online 24 December 2008.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
ERA 2012 Admin Only
School of Physical Sciences Publications
 
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Created: Thu, 03 Sep 2009, 18:31:27 EST by Mr Andrew Martlew on behalf of Physics