Ionospheric foF2 morphology and response of F2 layer height over Jicamarca during different solar epochs and comparison with IRI-2012 model

Diurnal, seasonal and annual foF2 variability and the response of the F2-layer height over Jicamarca (11.9 °S, 76.8 °W, 1 °N dip) during periods of low (LSA), moderate (MSA) and high (HSA) solar activities was investigated. The relative standard deviation ( V R ) was used for the analysis. The F2-la...

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Bibliographic Details
Published in:	Journal of Earth System Science Vol. 123; no. 4; pp. 751 - 765
Main Authors:	Adebesin, B O, Adekoya, B J, Ikubanni, S O, Adebiyi, S J, Adebesin, O A, Joshua, B W, Olonade, K O
Format:	Journal Article
Language:	English
Published:	India Springer India 01-06-2014 Springer Nature B.V
Subjects:	Aeronomy Earth and Environmental Science Earth Sciences F 2 region foF2 Height Ionosphere Magnetic fields Mathematical models Photochemistry Plasma drift Seasonal variability Solar activity Solar physics Space Exploration and Astronautics Space Sciences (including Extraterrestrial Physics Sunrise Sunset Variability Vertical drift Peru, Lima, Jicamarca relative standard deviation plasma drift F2-layer critical frequency post-sunset solar activity
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Summary:	Diurnal, seasonal and annual foF2 variability and the response of the F2-layer height over Jicamarca (11.9 °S, 76.8 °W, 1 °N dip) during periods of low (LSA), moderate (MSA) and high (HSA) solar activities was investigated. The relative standard deviation ( V R ) was used for the analysis. The F2-layer critical frequency pre-noon peak increases by a factor of 2 more than the post-noon peak as the solar activity increases. The variability coefficient ( V R ) is lowest during the day (7–16%) for the three solar epochs; increases during nighttime (20–26%, 14–26%, and 10–20%, respectively for the LSA, MSA and HSA years); and attained highest magnitude during sunrise (21–27%, 24–27%, and 19–30%, respectively in similar order). Two major peaks were observed in V R – the pre-sunrise peak, which is higher, and the post-sunset peak. Generally, the variability increases as the solar activity decreases. Annually, V R peaks within 23–24%, 19–24% and 15–24% for the LSA, MSA, and HSA periods, respectively. The ionospheric F2-layer height rises to the higher level with increasing solar activity. The foF2 comparison results revealed that Jicamarca is well represented on the IRI-2012 model, with an improvement on the URSI option. The importance of vertical plasma drift and photochemistry in the F2-layer was emphasized.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0253-4126 0973-774X
DOI:	10.1007/s12040-014-0435-y