Ionospheric absorption (ISAB) is the scientific name for absorption occurring as a result of the interaction between various types of electromagnetic waves and the free electrons in the ionosphere, which can interfere with radio transmissions.
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Ionosphericabsorption (ISAB) is the scientific name for absorption occurring as a result of the interaction between various types of electromagnetic...
A riometer (commonly relative ionospheric opacity meter, although originally: Relative Ionospheric Opacity Meter for Extra-Terrestrial Emissions of Radio...
known as auroral kilometric radiation (AKR), discovered in 1972. Ionosphericabsorption makes AKR only observable from space. X-ray emissions, originating...
A sudden ionospheric disturbance (SID) is any one of several ionospheric perturbations, resulting from abnormally high ionization/plasma density in the...
the height of the ionosphere, latitudinal changes in the Earth's magnetic field, sudden ionospheric disturbances, polar cap absorption, variation in the...
(DX) propagation tends to be more difficult due to higher D layer ionosphericabsorption. Long-distance propagation tends to occur only at night, and the...
lower region (D-region) of the ionosphere (around 50–80 km in altitude). This area is particularly important to ionospheric radio communications because...
particular the ionosphere, and does not reach the surface. This absorption can temporarily increase the ionization of the ionosphere which may interfere...
the ionosphere, the limiting frequency at or below which a wave component is reflected by, and above which it penetrates through, an ionospheric layer...
(IGY Instruction Manuals), Part I: Ionospheric Vertical Soundings and Part II: The Measurement of IonosphericAbsorption, published by Pergamon Press, London...
are affected by the phenomena of reflection, refraction, diffraction, absorption, polarization, and scattering. Understanding the effects of varying conditions...
process of the ionospheric plasma and causes therefore a decrease of the electron density within the ionospheric F-layer (negative ionospheric storm). A contraction...
The radio window's lower frequency limit is greatly affected by the ionospheric refraction of the radio waves whose frequencies are approximately below...
waves graze the ionosphere at a very blunt angle, the MUF may be much higher. The lowest usable frequency depends on the absorption in the lower layer...
rise with increasing altitude. This rise in temperature is caused by the absorption of ultraviolet radiation (UV) from the Sun by the ozone layer, which restricts...
frequency of the ionospheric F layer), refraction is insufficient to return the signal to earth and if it is too low, absorption in the ionospheric D layer may...
pulse method, to make ionospheric measurements. It was later adapted by Robert Watson-Watt to detect aeroplanes. Nowadays, ionospheric data is important when...
Prize winner, showed that this band was caused by the weak quadrupole absorption of molecular hydrogen, which thus became the second compound detected...
A S Mohana Rao; B Ramachandra Rao (1968). "Some studies on the ionosphericabsorption at Waltair". Journal of Atmospheric and Terrestrial Physics. 30...
and results in shortwave radio beyond line-of-sight. However, certain ionospheric effects begin to block incoming radiowaves from space, when their frequency...
AM transmissions cannot be ionospheric propagated during the day due to strong absorption in the D-layer of the ionosphere. In a crowded channel environment...
temperature decreases with increasing height. This is a result of decreasing absorption of solar radiation by the rarefied atmosphere having a diminishing relative...
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