The association between ULF geomagnetic fluctuations and Doppler ionospheric observations

Duffus, H. J.; Boyd, G. M.

doi:10.1016/0021-9169(68)90052-4

Cited by 20 publications

(10 citation statements)

References 14 publications

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“…The ratio of amplitudes of d variations and geomagnetic pulsations was 0.02-0.07 Hz/nT. This value is consistent with results (from 0.01 Hz/nT to 0.4 Hz/nT) obtained in [2,10]. It is clearly seen from Fig.…”

Section: Discussionsupporting

confidence: 94%

“…As in [2,3,6], in most cases we detected only a slight correlation between d variations and geomagnetic pulsations. The simultaneous recording of Pi2 geomagnetic pulsations and d variations shows: a) at all events an almost total absence of correlation between the time series; and b) in series of cases coincidence of the principal maxima on the plots of spectral density of these phenomena at the time of Pi2 observation.…”

Section: Discussionmentioning

confidence: 68%

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Ionospheric manifestations of geomagnetic pulsations at high latitudes

Lipko

Пашинин

Rahkmatulin

2002

Eighth International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

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In this paper the interrelation between geomagnetic pulsations and variations in frequency Doppler shift (Fd) of the ionosphere-reflected radio signal is under investigation. The experiment on simultaneous recording of Fd variations and geomagnetic pulsations was organised at high latitude station in Norilsk (geomagnetic latitude and longitude 64.2 N, 160.4 E, L=5.3) during Febrary-April of 1995-98. Thirty cases of simultaneous recording of duration from 10 min to two hour were analysed: 6 cases of simultaneous recording of variations Fd and regular geomagnetic pulsations Pc5; and 25 cases of recording of Fd variations and irregular pulsations Pi2. On the basis of experimental results, the following conclusions have been drawn: a) Hydromagnetic waves in the range of regular Pc5 pulsations, when interacting with the ionospheric F2 layer, make the main contribution to short-period Fd variations. The possible mechanism of Fd variations are oscillations of electron density, associated with distribution of a hydromagnetic wave in an ionosphere. b) There exists an unquestionable interrelation between Fd variations of the sporadic E layer-reflected radio signal and irregular Pi2 pulsations, but for some reasons it is traced poorly.Comment: EmTeX-386, 8 pages, 4 figures, article: P-gpion.tex, figures:F1-gpion.PS.Z; F2-gpion.PS.Z; F3-gpion.PS.Z; F4-gpion.PS.

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Section: Discussionsupporting

confidence: 94%

Section: Discussionmentioning

confidence: 68%

Ionospheric manifestations of geomagnetic pulsations at high latitudes

Lipko

Пашинин

Rahkmatulin

2002

Eighth International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

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“…Three decades ago a number of researchers reported observations of a correlation between rapid geomagnetic variations and frequency shifts in HF radio waves received obliquely after ionospheric reflection from distant stations (Chan et al, 1962;Duffus and Boyd, 1968). Subsequently there have been numerous reports dealing specifically with observations of ground-based ULF geomagnetic pulsations and simultaneous Doppler frequency shifts in HF radio waves reflected by the ionosphere at vertical incidence (Klostermeyer and Rottger, 1976;Menk et al, 1983;Sutcliffe and Poole, 1984;Watermann, 1987;Kolokolov and Marakhovskiy, 1988;Jarvis and Gough, 1988;Tedd et al, 1989;Yumoto et al, 1989;Menk, 1992).…”

Section: Examples Of Observationsmentioning

confidence: 99%

Modelling the Ionospheric Signatures of Geomagnetic Pulsations.

Sutcliffe¹

1994

J. geomagn. geoelec

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Oscillating phase shifts are frequently observed in ionospherically propagated HF radio waves in association with ULF geomagnetic pulsations. These Ionospheric Signatures of Pulsations (ISP) are observed in ionospherically reflected radio waves transmitted from ground stations, in radio signals transmitted from satellites to ground stations, and in the backscattered signals received by HF over-the-horizon radars. We review the techniques used to model the relationship between ISPs and geomagnetic pulsations. Model results for a variety of geophysical conditions are compared with observations.

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“…Special attention was paid to research of variations of local electron density or total electron content in the range of geomagnetic pulsations Pc3-Pc5 periods from 3 to 300 s (Duffus and Boyd, 1968;Al'perovich et al, 1991). Some experimental data indicate close linkage of the variations with large periods, including those within the period range of AGWs of large and medium scale.…”

Section: Introductionmentioning

confidence: 98%