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Testing the relationship between Saturn's ENA and narrowband radio emissions

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Testing the relationship between Saturn's ENA and narrowband radio emissions. / Kinrade, Joe; Badman, Sarah; Paranicas, Chris et al.
In: Planetary Radio Emissions IX, 14.07.2023, p. 355-367.

Research output: Contribution to Journal/MagazineConference articlepeer-review

Harvard

Kinrade, J, Badman, S, Paranicas, C, Jackman, C, Louis, C & O'Dwyer, E 2023, 'Testing the relationship between Saturn's ENA and narrowband radio emissions', Planetary Radio Emissions IX, pp. 355-367. https://doi.org/10.25546/103101

APA

Kinrade, J., Badman, S., Paranicas, C., Jackman, C., Louis, C., & O'Dwyer, E. (2023). Testing the relationship between Saturn's ENA and narrowband radio emissions. Planetary Radio Emissions IX, 355-367. https://doi.org/10.25546/103101

Vancouver

Kinrade J, Badman S, Paranicas C, Jackman C, Louis C, O'Dwyer E. Testing the relationship between Saturn's ENA and narrowband radio emissions. Planetary Radio Emissions IX. 2023 Jul 14;355-367. doi: 10.25546/103101

Author

Kinrade, Joe ; Badman, Sarah ; Paranicas, Chris et al. / Testing the relationship between Saturn's ENA and narrowband radio emissions. In: Planetary Radio Emissions IX. 2023 ; pp. 355-367.

Bibtex

@article{6ca6de70bf024d089b04496cd996f1bf,
title = "Testing the relationship between Saturn's ENA and narrowband radio emissions",
abstract = "Saturn{\textquoteright}s kilometric radiation (SKR) and Energetic Neutral Atom (ENA) emissions are important remote diagnostics of the planet{\textquoteright}s magnetospheric dynamics, intensifying during periods of global-scale plasma injection, and displaying characteristic planetary periodicity. Global-scale ENA signatures have been associated with narrowband radio emissions around 5 and 20 kHz, particularly at evening local times where plasma injections are expected to have moved inwards through the magnetosphere, triggering interchange instabilities. Narrowband radio emission sources are associated with density gradients at the inner edges of the Enceladus plasma torus that promote wave mode conversion, but any radial distance dependence with the ENA emission is untested. We constrain ENA keograms to distances covering the {\textquoteleft}inner{\textquoteright} and {\textquoteleft}outer{\textquoteright} magnetosphere separately, and quantify the correlation between the ENA intensity with narrowband flux density in the 5 and 20 kHz emission bands. One case study shows a spiral ENA morphology that indicates global-scale plasma injection activity. {\textquoteleft}Bursts{\textquoteright} of narrowband emission coincide with the rotation of ENA enhancements through the dusk-midnight local time sector in the inner magnetosphere, but at earlier times in the outer magnetosphere, consistent with inward flow of the injected plasma as it drifts around the planet. A second case study with similar observing conditions shows clear 5 kHz radio bursts, but very low levels of ENA detections, indicating that the relationship is not always so general in these data. These results contribute towards our developing picture of how global plasma injection events can influence Saturn{\textquoteright}s inner magnetosphere, linking together two valuable sources of remotely sensed global emissions, the ENAs and narrowband radio emissions.",
author = "Joe Kinrade and Sarah Badman and Chris Paranicas and Caitriona Jackman and Corentin Louis and Elizabeth O'Dwyer",
note = "Proceedings of the 9th International Workshop on Planetary, Solar and Heliospheric Radio Emissions, held at Dublin, Ireland, September 26-28 2022.",
year = "2023",
month = jul,
day = "14",
doi = "10.25546/103101",
language = "English",
pages = "355--367",
journal = "Planetary Radio Emissions IX",

}

RIS

TY - JOUR

T1 - Testing the relationship between Saturn's ENA and narrowband radio emissions

AU - Kinrade, Joe

AU - Badman, Sarah

AU - Paranicas, Chris

AU - Jackman, Caitriona

AU - Louis, Corentin

AU - O'Dwyer, Elizabeth

N1 - Proceedings of the 9th International Workshop on Planetary, Solar and Heliospheric Radio Emissions, held at Dublin, Ireland, September 26-28 2022.

PY - 2023/7/14

Y1 - 2023/7/14

N2 - Saturn’s kilometric radiation (SKR) and Energetic Neutral Atom (ENA) emissions are important remote diagnostics of the planet’s magnetospheric dynamics, intensifying during periods of global-scale plasma injection, and displaying characteristic planetary periodicity. Global-scale ENA signatures have been associated with narrowband radio emissions around 5 and 20 kHz, particularly at evening local times where plasma injections are expected to have moved inwards through the magnetosphere, triggering interchange instabilities. Narrowband radio emission sources are associated with density gradients at the inner edges of the Enceladus plasma torus that promote wave mode conversion, but any radial distance dependence with the ENA emission is untested. We constrain ENA keograms to distances covering the ‘inner’ and ‘outer’ magnetosphere separately, and quantify the correlation between the ENA intensity with narrowband flux density in the 5 and 20 kHz emission bands. One case study shows a spiral ENA morphology that indicates global-scale plasma injection activity. ‘Bursts’ of narrowband emission coincide with the rotation of ENA enhancements through the dusk-midnight local time sector in the inner magnetosphere, but at earlier times in the outer magnetosphere, consistent with inward flow of the injected plasma as it drifts around the planet. A second case study with similar observing conditions shows clear 5 kHz radio bursts, but very low levels of ENA detections, indicating that the relationship is not always so general in these data. These results contribute towards our developing picture of how global plasma injection events can influence Saturn’s inner magnetosphere, linking together two valuable sources of remotely sensed global emissions, the ENAs and narrowband radio emissions.

AB - Saturn’s kilometric radiation (SKR) and Energetic Neutral Atom (ENA) emissions are important remote diagnostics of the planet’s magnetospheric dynamics, intensifying during periods of global-scale plasma injection, and displaying characteristic planetary periodicity. Global-scale ENA signatures have been associated with narrowband radio emissions around 5 and 20 kHz, particularly at evening local times where plasma injections are expected to have moved inwards through the magnetosphere, triggering interchange instabilities. Narrowband radio emission sources are associated with density gradients at the inner edges of the Enceladus plasma torus that promote wave mode conversion, but any radial distance dependence with the ENA emission is untested. We constrain ENA keograms to distances covering the ‘inner’ and ‘outer’ magnetosphere separately, and quantify the correlation between the ENA intensity with narrowband flux density in the 5 and 20 kHz emission bands. One case study shows a spiral ENA morphology that indicates global-scale plasma injection activity. ‘Bursts’ of narrowband emission coincide with the rotation of ENA enhancements through the dusk-midnight local time sector in the inner magnetosphere, but at earlier times in the outer magnetosphere, consistent with inward flow of the injected plasma as it drifts around the planet. A second case study with similar observing conditions shows clear 5 kHz radio bursts, but very low levels of ENA detections, indicating that the relationship is not always so general in these data. These results contribute towards our developing picture of how global plasma injection events can influence Saturn’s inner magnetosphere, linking together two valuable sources of remotely sensed global emissions, the ENAs and narrowband radio emissions.

U2 - 10.25546/103101

DO - 10.25546/103101

M3 - Conference article

SP - 355

EP - 367

JO - Planetary Radio Emissions IX

JF - Planetary Radio Emissions IX

ER -