Jupiter's Whistler-Mode Belts and Electron Slot Region

IF 2.6 2区地球科学 Q2 ASTRONOMY & ASTROPHYSICS

Journal of Geophysical Research: Space Physics Pub Date : 2024-12-06 DOI:10.1029/2024JA032850

Y.-X. Hao, Y. Y. Shprits, J. D. Menietti, Z. Y. Liu, T. Averkamp, D. D. Wang, P. Kollmann, G. B. Hospodarsky, A. Drozdov, E. Roussos, N. Krupp, R. B. Horne, E. E. Woodfield, S. J. Bolton

{"title":"Jupiter's Whistler-Mode Belts and Electron Slot Region","authors":"Y.-X. Hao, Y. Y. Shprits, J. D. Menietti, Z. Y. Liu, T. Averkamp, D. D. Wang, P. Kollmann, G. B. Hospodarsky, A. Drozdov, E. Roussos, N. Krupp, R. B. Horne, E. E. Woodfield, S. J. Bolton","doi":"10.1029/2024JA032850","DOIUrl":null,"url":null,"abstract":"<p>The spatial distribution of whistler-mode wave emissions in the Jovian magnetosphere measured during the first 45 perijove orbits of Juno is investigated. A double-belt structure in whistler-mode wave intensity is revealed. Between the two whistler-mode belts, there exists a region devoid of 100 s keV electrons near the magnetic equator at <span></span><math>\n <semantics>\n <mrow>\n <mn>9</mn>\n <mo><</mo>\n <mi>M</mi>\n <mo><</mo>\n <mn>16</mn>\n </mrow>\n <annotation> $9< M< 16$</annotation>\n </semantics></math>. Insufficient source electron population in such an electron “slot” region is a possible explanation for the relatively lower wave activity compared to the whistler-mode belts. The wave intensity of the outer whistler-mode belt measured in the dusk-premidnight sector is significantly stronger than in the postmidnight-dawn sector. We suggest that the inherent dawn-dusk asymmetries in source electron distribution and/or auroral hiss emission rather than the modulation of solar cycle are more likely to result in the azimuthal variation of outer whistler-mode belt intensity during the first 45 Juno perijove orbits.</p>","PeriodicalId":15894,"journal":{"name":"Journal of Geophysical Research: Space Physics","volume":"129 12","pages":""},"PeriodicalIF":2.6000,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JA032850","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Geophysical Research: Space Physics","FirstCategoryId":"89","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1029/2024JA032850","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}

引用次数: 0

Abstract

The spatial distribution of whistler-mode wave emissions in the Jovian magnetosphere measured during the first 45 perijove orbits of Juno is investigated. A double-belt structure in whistler-mode wave intensity is revealed. Between the two whistler-mode belts, there exists a region devoid of 100 s keV electrons near the magnetic equator at $9 < M < 16$ . Insufficient source electron population in such an electron “slot” region is a possible explanation for the relatively lower wave activity compared to the whistler-mode belts. The wave intensity of the outer whistler-mode belt measured in the dusk-premidnight sector is significantly stronger than in the postmidnight-dawn sector. We suggest that the inherent dawn-dusk asymmetries in source electron distribution and/or auroral hiss emission rather than the modulation of solar cycle are more likely to result in the azimuthal variation of outer whistler-mode belt intensity during the first 45 Juno perijove orbits.

Abstract Image