Observations of the First Harmonic of Saturn Kilometric Radiation During Cassini's Grand Finale

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F22%3A00561095" target="_blank" >RIV/68378289:_____/22:00561095 - isvavai.cz</a>

Výsledek na webu

<a href="https://hal.science/hal-03807514/document" target="_blank" >https://hal.science/hal-03807514/document</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2022JA030776" target="_blank" >10.1029/2022JA030776</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Observations of the First Harmonic of Saturn Kilometric Radiation During Cassini's Grand Finale

Popis výsledku v původním jazyce

Clear first harmonic emissions of Saturn Kilometric Radiation are discovered during the Cassini Grand Finale orbits. Both ordinary (O) and extraordinary (X) mode fundamental emissions accompanied by X mode harmonics are observed. Analysis shows that the frequency ratio between the fundamental and harmonic emissions is 2.01 +/- 0.08, and the harmonic emissions display weaker intensities than the fundamental, by 30-40 dB for the X-X (fundamental-harmonic) type harmonic and 10-30 dB for the O-X type harmonic. The intensity relations between the two types of harmonics, that is, O-X and X-X show different patterns that we attribute to different conditions of emission at the source. Direction-finding results shows that the fundamental and harmonic emissions are plausibly generated in the same source region. In agreement with previous studies at Earth, the generation of the two types of harmonics can be attributed to the cyclotron maser instability operating with different plasma density and electron energy distributions in the source region.

Název v anglickém jazyce

Observations of the First Harmonic of Saturn Kilometric Radiation During Cassini's Grand Finale

Popis výsledku anglicky

Clear first harmonic emissions of Saturn Kilometric Radiation are discovered during the Cassini Grand Finale orbits. Both ordinary (O) and extraordinary (X) mode fundamental emissions accompanied by X mode harmonics are observed. Analysis shows that the frequency ratio between the fundamental and harmonic emissions is 2.01 +/- 0.08, and the harmonic emissions display weaker intensities than the fundamental, by 30-40 dB for the X-X (fundamental-harmonic) type harmonic and 10-30 dB for the O-X type harmonic. The intensity relations between the two types of harmonics, that is, O-X and X-X show different patterns that we attribute to different conditions of emission at the source. Direction-finding results shows that the fundamental and harmonic emissions are plausibly generated in the same source region. In agreement with previous studies at Earth, the generation of the two types of harmonics can be attributed to the cyclotron maser instability operating with different plasma density and electron energy distributions in the source region.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

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

2022

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

127

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

e2022JA030776

Kód UT WoS článku

000850891100001

EID výsledku v databázi Scopus

2-s2.0-85139061512