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http://hdl.handle.net/2248/4907
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DC Field | Value | Language |
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dc.contributor.author | Sastri, J. H | - |
dc.contributor.author | Sasidharan, K | - |
dc.contributor.author | Subramanyam, V | - |
dc.contributor.author | Srirama Rao, M | - |
dc.date.accessioned | 2009-11-13T12:47:49Z | - |
dc.date.available | 2009-11-13T12:47:49Z | - |
dc.date.issued | 1979-09 | - |
dc.identifier.citation | Annales De Geophysique, Vol. 35, No. 3, pp. 153 - 158 | en |
dc.identifier.issn | 0011-3891 | - |
dc.identifier.uri | http://hdl.handle.net/2248/4907 | - |
dc.description.abstract | Using ionogram data at Kodaikanal (geomagnetic lat. 06 deg N, Dip 3.5 deg N) over a seven year period, Jan. 1957-Dec. 1963, a study is made of the seasonal and sunspot cycle variations in the nocturnal occurrence of amplitude and frequency type of spread-F configurations. It is found that the occurrence of both amplitude and frequency type spread-F exhibits a positive dependence on the phase of the sunspot cycle. There is also a significant positive correlation between the occurrence patterns of amplitude and frequency type spread-F. The occurrence of amplitude type spread-F shows a prominent peak around 20-22 hrs LT, irrespective of season and phase of the sunspot cycle, except during local summer months of low sunspot years when it is shifted to the postmidnight period around 00-03 hrs LT. The peak occurrence of amplitude spread-F (for two hours around the peak) shows a semi-annual variation during years of moderate and low sunspot activity. A comparison of these results with those at other equatorial stations revealed a marked longitudinal dependence of the characteristics (nocturnal, seasonal and sunspot cycle changes) of amplitude and frequency type spread-F. | en |
dc.language.iso | en | en |
dc.publisher | European Geophysical Society | en |
dc.subject | Equatorial Atmosphere | en |
dc.subject | Nocturnal Variations | en |
dc.subject | Solar Activity Effects | en |
dc.subject | Solar Terrestrial Interactions | en |
dc.subject | Spread F | en |
dc.subject | Annual Variations | en |
dc.subject | Ionograms | en |
dc.subject | Sunspot Cycle | en |
dc.title | Range and frequency spread-F at Kodaikanal | en |
dc.type | Article | en |
Appears in Collections: | IIAP Publications |
Files in This Item:
File | Description | Size | Format | |
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Range and frequency spread-F at Kodaikanal | 388.55 kB | Adobe PDF | View/Open |
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