The distribution of irregularities in the Antarctic ionosphere-II Diurnal, magnetic and solar cycle effects

Stuart, G. F.; Titheridge, J. E.

doi:10.1016/0021-9169(69)90137-8

Cited by 10 publications

(2 citation statements)

References 20 publications

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“…Early measurements of fluctuations in the polarization angle of received satellite signal were made in the southern polar ionosphere by Titheridge and Stuart [1968]. In a subsequent paper Stuart and Titheridge [1969] used these data for the ascending phase of a solar cycle to investigate diurnal, magnetic and longer-term variations.…”

Section: Introductionmentioning

confidence: 99%

Phase scintillation and irregularities in the northern polar ionosphere

Kersley¹,

Russell²,

Rice³

1995

Radio Science

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Radio transmissions from Navy Navigation Satellite System (NNSS) satellites have been used to study phase scintillation and ionospheric irregularities at northern polar latitudes. The observations were made at Ny Alesund, a station in the vicinity of the daytime cusp and under the polar cap on the nightside. The analysis concentrates on data obtained over an extended period when more than 7000 satellite passes were recorded to provide estimates of the σф phase scintillation parameter for some 300,000 data intervals. The results show a marked difference in scintillation and irregularity occurrence with season. During the summer months the main feature is a maximum around magnetic noon, apparently associated with irregularities in the cusp region. In winter, irregularities are found at all times of day though there is a noon maximum that extends in a latitudinal belt into the afternoon and evening. The premidnight sector shows the highest occurrence levels in the polar cap. Investigation of signal fading rates indicates that doppler shifting resulting from irregularities convecting rapidly towards the station in the premidnight polar cap may contribute to the occurrence patterns. Under quiet geomagnetic conditions during summer the irregularities form a belt essentially in the morning sector, following the auroral oval. There is expansion to lower latitudes with increased geomagnetic activity and increased occurrence in the afternoon. In winter, irregularities can be seen at all hours even under quiet conditions, with the afternoon and evening showing greatest occurrence at times of geomagnetic disturbance. The pattern of scintillation occurrence with respect to the station indicates that the irregularities may be in the form of field‐aligned sheets of low axial ratio. In contrast to observations of L shell confined sheets at auroral latitudes there are indications from the current work that the irregularities are stretched in the antisunwards convective flow across the polar cap.

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Section: Introductionmentioning

confidence: 99%

Phase scintillation and irregularities in the northern polar ionosphere

Kersley¹,

Russell²,

Rice³

1995

Radio Science

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“…However, the finding byAarons et al [1969] that the scintillation-boundary latitude varies diurnally between 55 and 75 ø in a systematic manner indicates that much, and possibly all, of this reported diurnal variation in scintillation activity is attributable to movement of the boundary. Satellite studies [e.g.,Stuart and Titheridge, 1969;Singleton, 1969] show that scintillation is strong nearly all the time poleward of the boundary. Seasonal variation.…”

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confidence: 98%

Worldwide Behavior of Average VHF‐UHF Scintillation

Fremouw¹,

Bates²

1971

Radio Science

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A description of the latitudinal, diurnal, seasonal, and solar‐cycle variations of F‐layer‐produced scintillations, based on a comprehensive review of the literature, is given. Three distinct latitudinal regimes are discussed in regard to scintillation behavior and the quantitative utility of observations reported in the literature. A semiquantitative empirical model is suggested to describe the strength of scintillation‐producing irregularities of F‐layer electron density. Recent work suggests that more quantitative modeling might now be fruitful, but gaps in fully quantitative data exist. The prime needs are for observations at very high latitudes and for calibration of scintillation indices used at very low latitudes.

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Auroral enhancement of ionospheric electron density

Bates

1970

Journal of Atmospheric and Terrestrial Physics

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The distribution of irregularities in the Antarctic ionosphere-II Diurnal, magnetic and solar cycle effects

Cited by 10 publications

References 20 publications

Phase scintillation and irregularities in the northern polar ionosphere

Phase scintillation and irregularities in the northern polar ionosphere

Worldwide Behavior of Average VHF‐UHF Scintillation

Auroral enhancement of ionospheric electron density

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