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Title: Diurnal and seasonal variations in sporadic E-layer (Es layer) occurrences over equatorial, low and mid latitude stations - A comparative study
Authors: Prasad, S N V S
Prasad, D S V V D
Venkatesh, K
Niranjan, K
Rao, P V S Rama
Keywords: Ionospheric Disturbances
Sporadic E-layer
Critical Frequency
Blanketing Frequency
Issue Date: Feb-2012
Publisher: NISCAIR-CSIR, India
PACS No.: 94.20.dg; 94.20.Vv
Abstract: The simultaneous hourly ionograms, from an equatorial station Trivandrum (8.47°N, 76.91°E), a low latitude station Waltair (17.70N, 83.3°E) in the Indian sector and a mid latitude station Kokubunji (35.7°N, 139.5°E) in the Japanese sector during the high sunspot year 2001, are scaled for the study of E-region parameters, namely the virtual height of sporadic E-layer (h’Es) and the critical frequency of sporadic E-layer (foEs). The diurnal, seasonal and day-to-day variations in h’Es and foEs are studied for all the three stations. It is observed that the sporadic E-layer is absent in the early morning and post sunset hours over Trivandrum during three different seasons. The values of h’Es are more at Kokubunji as compared to those at equatorial (Trivandrum) and low latitude (Waltair) stations during the three different seasons. The critical frequency of sporadic E-layer (foEs) over Trivandrum shows higher values, compared to those over Waltair and Kokubunji during daytime hours, in three different seasons indicating that foEs decrease as the latitude increases. The seasonal variation in foEs shows higher values during daytime hours of equinox and winter months over equator (Trivandrum) compared to those over low (Waltair) and mid (Kokubunji) latitude stations. The variations in h’Es and foEs for quiet and disturbed conditions indicate that the h’Es variation during quiet days of equinoctial months at Kokubunji shows a primary peak around morning hours while it is absent at Waltair and Trivandrum. Further, the behaviour of blanketing frequency of Es layer fbEs, and foEs-fbEs are also studied.
Page(s): 26-38
CC License:  CC Attribution-Noncommercial-No Derivative Works 2.5 India
ISSN: 0975-105X (Online); 0367-8393 (Print)
Source:IJRSP Vol.41(1) [February 2012]

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