Solar eclipses and their effects in the ionospheric plasma

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F16%3A00465441" target="_blank" >RIV/68378289:_____/16:00465441 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Solar eclipses and their effects in the ionospheric plasma

Original language description

Terrestrial atmosphere shows a high variability over a broad range of periodicities, which mostly consistsnof wave-like perturbations characterized by various spatial and temporal scales. The interest for shortntime variability in ionospheric attributes is related to the role that ionosphere plays in the Earth'snenvironment and space weather. Acoustic-gravity waves (AGWs), waves in the period range from subsecondsnto several hours, are sources of most of the short-time ionospheric variability and play annimportant role in the dynamics and energetics of atmosphere and ionosphere systems.nnDuring solar eclipse, the lunar shadow creates a cool spot in the atmosphere that sweeps at supersonicnspeed across the Earth’s atmosphere. The atmosphere strongly responds to the decrease in ionizationnflux and heating. The very sharp border between sunlit and eclipsed region, characterized by strongngradients in temperature and ionization flux, moves throughout the atmosphere and drives it into a nonequilibriumnstate. Acoustic-gravity waves contribute to the return to equilibrium. At thermosphericnheights, the reduction in temperature causes a decrease in pressure over the totality footprint to whichnthe neutral winds respond. Thermal cooling and downward transport of gases lead to neutral compositionnchanges in the thermosphere that have significant influence on the resulting electron density distribution.nAlthough the mechanisms are not well understood, experimental studies show direct evidence that solarneclipses induce wave-like oscillations in the acoustic-gravity wave domain.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

DG - Atmospheric sciences, meteorology

OECD FORD branch

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Project

<a href="/en/project/GA15-24688S" target="_blank" >GA15-24688S: Variability of the ionosphere and neutral atmosphere in midlatitudes</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů