A particular form of Saturn kilometric radiation at the low end of its spectrum

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F23%3A00583178" target="_blank" >RIV/68378289:_____/23:00583178 - isvavai.cz</a>

Výsledek na webu

<a href="https://ui.adsabs.harvard.edu/abs/2023pre9.conf03099F/abstract" target="_blank" >https://ui.adsabs.harvard.edu/abs/2023pre9.conf03099F/abstract</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

A particular form of Saturn kilometric radiation at the low end of its spectrum

Popis výsledku v původním jazyce

We studied the spectral morphology of Saturn kilometric radiation (SKR) with the Cassini RPWS (Radio and Plasma Wave Science) instrument and found a particular structure at very low frequencies which we nicknamed ´caterpillar´ due to its shape and look in dynamic spectra. In this paper we want to present the main physical characteristics of this newly identified form of SKR at the low end of its spectrum. Caterpillars are coarse SKR structures lasting for several hours at frequencies mostly below 40 kHz and with a typical bandwidth of about 10^15 kHz. The latter feature makes them easily distinguishable from Saturn narrowband emissions. Some of the caterpillars are connected to the main SKR emission at higher frequencies and some not. Their polarization is often opposite to that of the main SKR emission, and their total polarization degree is lower. We found almost 600 caterpillar emissions throughout the Cassini mission, and they were preferentially observed from beyond a distance of 10 Saturn radii in the equatorial plane or at lower latitudes. At high time resolution caterpillars show a smooth spectral structure, and only the so-called striations were sometimes found being superimposed.

Název v anglickém jazyce

A particular form of Saturn kilometric radiation at the low end of its spectrum

Popis výsledku anglicky

We studied the spectral morphology of Saturn kilometric radiation (SKR) with the Cassini RPWS (Radio and Plasma Wave Science) instrument and found a particular structure at very low frequencies which we nicknamed ´caterpillar´ due to its shape and look in dynamic spectra. In this paper we want to present the main physical characteristics of this newly identified form of SKR at the low end of its spectrum. Caterpillars are coarse SKR structures lasting for several hours at frequencies mostly below 40 kHz and with a typical bandwidth of about 10^15 kHz. The latter feature makes them easily distinguishable from Saturn narrowband emissions. Some of the caterpillars are connected to the main SKR emission at higher frequencies and some not. Their polarization is often opposite to that of the main SKR emission, and their total polarization degree is lower. We found almost 600 caterpillar emissions throughout the Cassini mission, and they were preferentially observed from beyond a distance of 10 Saturn radii in the equatorial plane or at lower latitudes. At high time resolution caterpillars show a smooth spectral structure, and only the so-called striations were sometimes found being superimposed.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GF20-06802L" target="_blank" >GF20-06802L: Analýza jemné struktury aurorálních rádiových emisí</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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