Observation of seasonal asymmetry in the range spread F occurrence at different longitudes during low and moderate solar activity

Abimbola O. Afolayan, Mandeep Singh Jit Singh, Mardina Abdullah, Suhaila M. Buhari, Tatsuhiro Yokoyama, Pornchai Supnithi

Research output: Contribution to journalArticle

Abstract

A comparative study of the equatorial spread F occurrence was conducted at different longitudes during 2010 and 2013 representing the low (LSA) and moderate (MSA) solar activity periods respectively. The ionogram data were recorded at low-latitude stations including Jicamarca (JIC;75.76°W, 8.17° S), Fortaleza (FZA; 38.52°W, 3.73° S), Ilorin (ILR; 7.55° E, 9.93° N), Chumphon (CPN; 88.46° E, 11° N) and Kwajalein (KWA; 167.73° E, 8.72° N). The range type spread F (RSF) occurrence was manually recorded at an hourly interval between 18:00 and 06:00 LT, and a monthly average of the RSF occurrence was estimated for each season. The longitudinal distribution of the RSF occurrence features included the observed difference in the onset time, the duration and the seasonal occurrence peak. The seasonal asymmetry in the RSF occurrence distribution was analysed in relation to the zonal drift reversal's effect on the plasma irregularity initiation.We believe that the inconsistent equinoctial asymmetry pattern in the RSF occurrence is modulated by the seasonal/longitudinal variation of the zonal drift reversal delay during both solar epochs. Likewise, the seeding effect and the background ionospheric condition were also considered as major factors influencing the frequency of irregularity generation in these regions.

Original languageEnglish
Pages (from-to)733-745
Number of pages13
JournalAnnales Geophysicae
Volume37
Issue number4
DOIs
Publication statusPublished - 21 Aug 2019

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spread F
solar activity
asymmetry
occurrences
seeding
comparative study
plasma
irregularities
ionograms
inoculation
distribution
effect
tropical regions
ionospherics
stations
time measurement
intervals
station

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Geology
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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Observation of seasonal asymmetry in the range spread F occurrence at different longitudes during low and moderate solar activity. / Afolayan, Abimbola O.; Jit Singh, Mandeep Singh; Abdullah, Mardina; Buhari, Suhaila M.; Yokoyama, Tatsuhiro; Supnithi, Pornchai.

In: Annales Geophysicae, Vol. 37, No. 4, 21.08.2019, p. 733-745.

Research output: Contribution to journalArticle

Afolayan, Abimbola O. ; Jit Singh, Mandeep Singh ; Abdullah, Mardina ; Buhari, Suhaila M. ; Yokoyama, Tatsuhiro ; Supnithi, Pornchai. / Observation of seasonal asymmetry in the range spread F occurrence at different longitudes during low and moderate solar activity. In: Annales Geophysicae. 2019 ; Vol. 37, No. 4. pp. 733-745.
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