Home » News & Blogs » Traveling Ionospheric Disturbances as Huge Natural Lenses: Solar Radio Emission Focusing Effect by A. Koval et al*
Bookmark and Share
Solar Radio Science Highlights

Traveling Ionospheric Disturbances as Huge Natural Lenses: Solar Radio Emission Focusing Effect by A. Koval et al*

29 Aug 2017, 11:02 UTC
Traveling Ionospheric Disturbances as Huge Natural Lenses: Solar Radio Emission Focusing Effect  by A. Koval et al*
(200 words excerpt, click title or image to see full post)

The solar radio emission in meter-decameter wavelengths demonstrates a plentiful variety of solar radio bursts of different types (with branching to sub-types) as well as events not belonging to any specific type (Melnik et al. 2005). The last group includes variable solar emissions that result from radiation processes affected by propagation effects in the terrestrial ionosphere. Particularly, low-frequency solar radiation passing through the ionosphere could be subject to different influences such as reflection, scattering, and absorption along with refraction. The latter, in addition to causing a regular positional dispersion of solar radio sources proportional to the inverse square of the frequency, may also involve focusing and defocusing of solar radiation (Meyer-Vernet et al. 1981). Evidently, the natural focusing of radio waves from the Sun by the Earth’s ionosphere represents one specific aspect of the solar-terrestrial relationship.
In the paper we present an in-depth study about spectral perturbations appearing in solar dynamic spectra and being manifestations of the focusing effect of low-frequency solar emission by the Earth’s ionosphere. Such perturbations, known as Spectral Caustics (SCs), are considered to be the result of the refraction of radio waves by medium scale traveling ionospheric disturbances (MSTIDs). The latter are identified as moving wave-like ...

Latest Vodcast

Latest Podcast

Advertise PTTU

NASA Picture of the Day

Astronomy Picture of the Day

astronomy_pod