The Radio Wave Polarization of Saturn Lightning Observed by Cassini

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F25%3A00636307" target="_blank" >RIV/68378289:_____/25:00636307 - isvavai.cz</a>

Výsledek na webu

<a href="https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2024JA033560" target="_blank" >https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2024JA033560</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2024JA033560" target="_blank" >10.1029/2024JA033560</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The Radio Wave Polarization of Saturn Lightning Observed by Cassini

Popis výsledku v původním jazyce

We investigate the polarization of the radio waves emitted by lightning in Saturn's atmosphere, which are referred to as SEDs for Saturn Electrostatic Discharges. Using the complete SED data set retrieved by Cassini's RPWS (Radio and Plasma Wave Science) instrument we found that the circular polarization of SEDs below a frequency of 2 MHz depends on the latitudinal hemisphere of the lightning storm. SEDs from several storms located at 35 degrees $35{}<^>{circ}$ South latitude display a strong right-hand sense of circular polarization, whereas SEDs from storms located at 35 degrees $35{}<^>{circ}$ and 50 degrees $50{}<^>{circ}$ North are overwhelmingly left-hand polarized. A single storm located at Saturn's equator in June 2005 shows 4 right-handed SEDs when Cassini was in the northern hemisphere and 4 left-handed SEDs when Cassini was in the southern hemisphere. The polarization characteristic is consistent with an emission in the L-O mode, consistent with the theory of Fischer, Gurnett, et al. (2007, JGR 112, A12308, ) that the R-X mode is largely absorbed in Saturn's ionosphere below a frequency of 2 MHz. The sense of circular SED polarization below 2 MHz is opposite to the polarization of Saturn kilometric radiation (SKR), and thus this can be used to distinguish SEDs from SKR and to determine the hemispherical origin of the causative lightning storm.

Název v anglickém jazyce

The Radio Wave Polarization of Saturn Lightning Observed by Cassini

Popis výsledku anglicky

We investigate the polarization of the radio waves emitted by lightning in Saturn's atmosphere, which are referred to as SEDs for Saturn Electrostatic Discharges. Using the complete SED data set retrieved by Cassini's RPWS (Radio and Plasma Wave Science) instrument we found that the circular polarization of SEDs below a frequency of 2 MHz depends on the latitudinal hemisphere of the lightning storm. SEDs from several storms located at 35 degrees $35{}<^>{circ}$ South latitude display a strong right-hand sense of circular polarization, whereas SEDs from storms located at 35 degrees $35{}<^>{circ}$ and 50 degrees $50{}<^>{circ}$ North are overwhelmingly left-hand polarized. A single storm located at Saturn's equator in June 2005 shows 4 right-handed SEDs when Cassini was in the northern hemisphere and 4 left-handed SEDs when Cassini was in the southern hemisphere. The polarization characteristic is consistent with an emission in the L-O mode, consistent with the theory of Fischer, Gurnett, et al. (2007, JGR 112, A12308, ) that the R-X mode is largely absorbed in Saturn's ionosphere below a frequency of 2 MHz. The sense of circular SED polarization below 2 MHz is opposite to the polarization of Saturn kilometric radiation (SKR), and thus this can be used to distinguish SEDs from SKR and to determine the hemispherical origin of the causative lightning storm.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

<a href="/cs/project/GF24-11046L" target="_blank" >GF24-11046L: Radiové emise planety Saturn: otevřené otázky</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Journal of Geophysical Research-Space Physics

ISSN

2169-9380

e-ISSN

2169-9402

Svazek periodika

130

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

17

Strana od-do

e2024JA033560

Kód UT WoS článku

001503610500001

EID výsledku v databázi Scopus

2-s2.0-105007622001