Ionospheric radio propagation

Davies, K.

doi:10.6028/nbs.mono.80

Cited by 299 publications

(160 citation statements)

References 21 publications

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“…This will adversely affect the operation of HF radio-communication systems used at high latitudes unless corrective action is taken as these E s modes have different frequency/ground range dependencies from the F 2 mode. This phenomenon known as ''E-layer cut off'' (Davies, 1965) is significant in high latitude regions because any frequency that penetrates the E s layer at a given point to reach the F-layer is also close to the maximum useable frequency (MUF) of the F 2 -layer at its point of incidence with that layer. Partially reflecting E s can cause serious multipath and mode interference, especially detrimental to data transmission systems.…”

Section: Discussionmentioning

confidence: 99%

Observations on the variability and screening effect of Sporadic-E

Ritchie

Honary

2009

Journal of Atmospheric and Solar-Terrestrial Physics

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a b s t r a c tSporadic-E is a problem in high latitude HF communications because of its irregular and as yet unpredictable behaviour. This paper characterises the change in E-layer critical frequency (f o E) that occurs in the four hours following a storm sudden commencement (SSC) event which is a precursor to magnetospheric storms which adversely affect ionospheric communications.Following checks for any seasonal or solar activity dependency in the data, further analysis determines the occurrence of full blanketing (screening) Sporadic-E layer formation at high latitudes as seen on vertical ionosondes in Northern Finland (671 Latitude). An appropriate threshold value of f o E is proposed that could be used following the commencement of ionospheric storms, indicating that there is a high probability that F-layer screening will occur. As far as the authors are aware this is the first statistical analysis of the onset of Sporadic-E following SSC.

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Section: Discussionmentioning

confidence: 99%

Observations on the variability and screening effect of Sporadic-E

Ritchie

Honary

2009

Journal of Atmospheric and Solar-Terrestrial Physics

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“…at 100 km is 43 mV/m for the neutral density of 7.8 Â 10 18 /m 3 (Davies and Sporadic, 1965). The ionization coefficient is…”

Section: Review Of Precursory Phenomena Before Large Earthquakesmentioning

confidence: 99%

Investigation of precursory phenomena in the ionosphere, atmosphere and groundwater before large earthquakes of M>6.5

Ondoh¹

2009

Advances in Space Research

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“…These were obtained by investigators in Canada, Japan, the USA and the USSR as described in the previous paragraph. The solar activity dependencies in the ionosphere of E, Fl and layers have been investigated by Davis (1965) and Kasuya et al (1956) as follows;…”

Section: Discussionmentioning

confidence: 99%

Relation between Sunspot Number and Charged Particle Density in the Upper Ionosphere

Hirao

Miyazaki²

1967

J. geomagn. geoelec

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Recently, the profiles of charged particle density in the top-side ionosphere have been measured by satellites and rockets including the Japanese sounding rocket Lambda. As charged particle density is controlled by solar activity, the relation between their quantities is investigated by means of plasma frequency and sunspot number. The result is that this relation may be expressed as the function of plasma temperature and ion composition at 400km.

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Ionospheric radio propagation

Cited by 299 publications

References 21 publications

Observations on the variability and screening effect of Sporadic-E

Observations on the variability and screening effect of Sporadic-E

Investigation of precursory phenomena in the ionosphere, atmosphere and groundwater before large earthquakes of M>6.5

Relation between Sunspot Number and Charged Particle Density in the Upper Ionosphere

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