Anomalous Absorption Of Radio Waves Research Articles

Anomalous Absorption of Radio Waves by Small-Scale Magnetic-Field-Aligned Irregularities

We study the anomalous absorption of radio waves by small-scale magnetic-field-aligned artificial irregularities taking into account the effect of such irregularities on the propagation of the excited Z -mode. It is shown that this process becomes significant if the transverse size of field-aligned irregularities is of the order of 0.1c/ω or greater, where ω is the radio wave frequency and c is the speed of light in vacuum.

Problem of anomalous absorption of radio waves in the disturbed region of the ionosphere

Problem of anomalous absorption of radio waves in the disturbed region of the ionosphere

Intensity of x-ray solar radiation and the value of the anomalous absorption of radio waves during periods of sudden ionospheric disturbances

An experimental statistical dependence is obtained between the intensity of the x-ray radiation of the sun in the range 1–8 a (I1−8) and the value of the anomalous absorption of radio waves at a frequency of I=13 MHz during periods of sudden ionospheric disturbances. This dependence has the form γ13 ∼ I1–80.8cos χ, and can be used for the operative classification of bursts of x-ray radiation. Its character is explained by a decrease in the coefficient of the losses of electrons with a rise in the intensity of the x-ray radiation.

Frequency dependence of the anomalous absorption of radio waves during sudden ionospheric disturbances

Frequency dependence of the anomalous absorption of radio waves during sudden ionospheric disturbances

The relationship between the anomalous absorption of radio waves during periods of sudden ionic perturbations and the zenith angle of the sun

The relationship between the anomalous absorption of radio waves during periods of sudden ionic perturbations and the zenith angle of the sun

Anomalous absorption of radio waves by electrojet irregularities

The enhanced absorption of radio waves (with a frequency close to the upper hybrid frequency) in the equatorial electrojet by resonant coupling to electrojet irregularities and damped upper hybrid modes is investigated. It is found that, under normal ionospheric conditions, the absorption coefficient for such radio waves may be increased by a factor of as large as 100.

The electron density distribution in the - and -regions during days of anomalous radio wave absorption in winter

The electron density distribution in the - and -regions during days of anomalous radio wave absorption in winter

Absorption of Ultra High-Frequency Radio Waves in Organic Liquids

THE anomalous absorption of radio waves of wave-lengths lying between 50 cm. and 1 metre was observed long ago by Drude1, Romanoff2 and others. Romanoff studied the absorption in some alcohols at about 16 C. in the region λ= 57—88 cm., and observed some absorption peaks in this region in each case. Later on, Mizushima3 studied the absorption of continuous radio waves of wave-length λ = 6.1 metres by glycerine, a few alcohols, ether and acetone at different temperatures, and observed absorption peaks at low temperatures in all cases except in the latter two liquids, which did not show any absorption even at — 69° C. The results thus tend to show that the phenomenon is not necessarily exhibited by liquids having polar molecules.