Day‐to‐day variability of foEs in the equatorial ionosphere. Issue 5 (13th September 2013)
- Record Type:
- Journal Article
- Title:
- Day‐to‐day variability of foEs in the equatorial ionosphere. Issue 5 (13th September 2013)
- Main Title:
- Day‐to‐day variability of foEs in the equatorial ionosphere
- Authors:
- Somoye, E. O.
Akala, A. O.
Adeniji‐Adele, R. A.
Onori, E. O.
Ogwala, A.
Karimu, A. O. - Abstract:
- <abstract abstract-type="main"> <title>Abstract</title> <p>[1] Diurnal, seasonal, and solar cycle effects of the variability (VR) of the critical frequency of sporadic <italic>E</italic> layer (<italic>f<sub>o</sub>E<sub>sq</sub></italic>) are investigated at Ibadan (7.4°N, 3.9°E, 6°S dip) in the African sector during high solar activity (HSA) year of 1958 (<italic>Rz</italic> = 181), moderate solar activity (MSA) year of 1973 (<italic>Rz</italic> = 30), and low solar activity (LSA) year of 1965 (<italic>Rz</italic> = 17). The diurnal variation of <italic>f<sub>o</sub>E<sub>sq</sub></italic> VR is characterized by post‐midnight (32%–78%) and pre‐midnight (20%–84%) peaks during high solar activity (HSA), the only epoch of the three showing these peaks and a diurnal trend. While the daytime <italic>f<sub>o</sub>E<sub>sq</sub></italic> VRs of the three epochs show no seasonal trend, pre‐midnight and post‐midnight, the <italic>f<sub>o</sub>E<sub>sq</sub></italic> VRs during HSA and LSA show seasonal trends. Similarity is observed in the curve of reciprocal of percentage occurrence of <italic>E<sub>sq</sub></italic> and that of <italic>f<sub>o</sub>E<sub>sq</sub></italic> VR, indicating inverse variation of percentage occurrence and <italic>f<sub>o</sub>E<sub>sq</sub></italic> VR. Longitudinal influence is observed in the diurnal variation of HSA and MSA July <italic>f<sub>o</sub>E<sub>sq</sub></italic> VR of Ibadan (7.4°N, 3.9°E, 6°S dip) in the African sector, which is in the<abstract abstract-type="main"> <title>Abstract</title> <p>[1] Diurnal, seasonal, and solar cycle effects of the variability (VR) of the critical frequency of sporadic <italic>E</italic> layer (<italic>f<sub>o</sub>E<sub>sq</sub></italic>) are investigated at Ibadan (7.4°N, 3.9°E, 6°S dip) in the African sector during high solar activity (HSA) year of 1958 (<italic>Rz</italic> = 181), moderate solar activity (MSA) year of 1973 (<italic>Rz</italic> = 30), and low solar activity (LSA) year of 1965 (<italic>Rz</italic> = 17). The diurnal variation of <italic>f<sub>o</sub>E<sub>sq</sub></italic> VR is characterized by post‐midnight (32%–78%) and pre‐midnight (20%–84%) peaks during high solar activity (HSA), the only epoch of the three showing these peaks and a diurnal trend. While the daytime <italic>f<sub>o</sub>E<sub>sq</sub></italic> VRs of the three epochs show no seasonal trend, pre‐midnight and post‐midnight, the <italic>f<sub>o</sub>E<sub>sq</sub></italic> VRs during HSA and LSA show seasonal trends. Similarity is observed in the curve of reciprocal of percentage occurrence of <italic>E<sub>sq</sub></italic> and that of <italic>f<sub>o</sub>E<sub>sq</sub></italic> VR, indicating inverse variation of percentage occurrence and <italic>f<sub>o</sub>E<sub>sq</sub></italic> VR. Longitudinal influence is observed in the diurnal variation of HSA and MSA July <italic>f<sub>o</sub>E<sub>sq</sub></italic> VR of Ibadan (7.4°N, 3.9°E, 6°S dip) in the African sector, which is in the neighborhood of the Greenwich Meridian (GM); Singapore (1.3°N, 108.3°E, 17.6°S dip) in the Asian sector, east of GM; and Huancayo (12°S, 284.7°E, 1.9<sup>0</sup> dip) in the American sector, west of GM.</p> </abstract> … (more)
- Is Part Of:
- Radio science. Volume 48:Issue 5(2013:Oct.)
- Journal:
- Radio science
- Issue:
- Volume 48:Issue 5(2013:Oct.)
- Issue Display:
- Volume 48, Issue 5 (2013)
- Year:
- 2013
- Volume:
- 48
- Issue:
- 5
- Issue Sort Value:
- 2013-0048-0005-0000
- Page Start:
- 513
- Page End:
- 518
- Publication Date:
- 2013-09-13
- Subjects:
- Radio meteorology -- Periodicals
Radio wave propagation -- Periodicals
621.38405 - Journal URLs:
- http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1944-799X ↗
http://www.agu.org/journals/rs/ ↗
http://onlinelibrary.wiley.com/ ↗ - DOI:
- 10.1002/rds.20057 ↗
- Languages:
- English
- ISSNs:
- 0048-6604
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 7232.999500
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 3032.xml