The dependence of ionospheric absorption of MF radio waves at mid-latitudes on planetary magnetic activity

Bourne, I. A.; Hewitt, L. W.

doi:10.1016/s0021-9169(68)91243-9

Cited by 32 publications

(2 citation statements)

References 15 publications

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“…However, on an "event" basis, the correlation is known to be good for locations L = 2.5-4.4. This was emphasized by Bourne and Hewitt (1968), who showed by means of superposed epoch analysis that maxima in absorption followed maxima in K, by 1-4 days, the absorption remaining high for several days thereafter.…”

Section: Absorption and Magnetic Activitymentioning

confidence: 93%

Radiowave absorption at an auroral latitude

Gregory¹,

Manson²,

Rees³

1970

Can. J. Phys.

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Radiowave absorption at 2.2 MHz has been measured by the A1 method (vertical incidence, pulse), during noon periods from November 1967 – October 1968 at Saskatoon (52° N, 106° W, 61.5° invariant latitude). Monthly mean values are not strongly determined by direct solar control. Maxima of absorption are found in February, and in September–October, during which periods there is increased auroral activity. Correlation with magnetic activity on a daily basis is poor except during these months, and is good only when ΣKp is greater than 6 (6 h) during high absorption events. The "winter anomaly" of absorption, as evidenced in a log ρ, log (cos χ) plot, is present in modified form, when compared to mid-latitude seasonal variations. A regression equation shows that the response of absorption to changes in stratospheric temperatures over the Canadian prairies is less than to changes in Kp and is below the significance level of 10%. The coefficients of the temperature and Kp terms in the regression relation for eastern Canada (Ottawa, L = 3.6) are highly significant.

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Section: Absorption and Magnetic Activitymentioning

confidence: 93%

Radiowave absorption at an auroral latitude

Gregory¹,

Manson²,

Rees³

1970

Can. J. Phys.

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“…Measurements based on the reflection of radio waves from the ionosphere have shown that ionospheric absorption can strongly increase following certain geomagnetic storms. The phenomenon called the 'absorption aftereffect' was mainly observed at high-and midlatitude stations in Europe [Lauter and Knuth, 1967;Bourne and Hewitt, 1968].…”

Section: Ionospheric Absorption and Geomagnetic Activitymentioning

confidence: 99%

Links between atmospheric electricity and ionospheric absorption due to extraterrestrial influences

Märcz¹

1976

J. Geophys. Res.

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Earlier investigations (Märcz, 1971, 1973) have shown an increase of ionospheric absorption measured at the observatory near Nagycenk, Hungary, after certain geomagnetic storms. As is indicated by the present analyses, extremely high ionospheric night absorption can be followed by enhanced night averages of the potential gradient measured on the ground at the observatories near Nagycenk, Hungary, and Swider, Poland. This enhancement often lasts several days. A latitude dependence of the effect might be assumed. Different possibilities for the selection of intervals with extraterrestrial influences (on atmospheric electric parameters) have been checked. Results of investigations controlling the meteorological influences are also presented.

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Airglow Observations and the Interpretation of Ionospheric Disturbances Associated with Magnetic Storms

Thomas¹

1971

The Radiating Atmosphere

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The dependence of ionospheric absorption of MF radio waves at mid-latitudes on planetary magnetic activity

Cited by 32 publications

References 15 publications

Radiowave absorption at an auroral latitude

Radiowave absorption at an auroral latitude

Links between atmospheric electricity and ionospheric absorption due to extraterrestrial influences

Airglow Observations and the Interpretation of Ionospheric Disturbances Associated with Magnetic Storms

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