In Situ Analysis of Jupiter's Broadband Kilometric Auroral Radio Emissions With Juno

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geophysical Research Letters Pub Date : 2025-05-12 DOI:10.1029/2024GL114447

B. Collet, L. Lamy, C. K. Louis, V. Hue, T. K. Kim

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Abstract

Among the zoo of Jovian auroral radio emissions, the broadband kilometric (bKOM) component has been the least studied. Taking advantage of Juno in situ measurements within the auroral regions, we surveyed the Juno/Waves radio observations over the 60 first orbits to identify 7 bKOM source candidates. These were mostly detected during dawn storm auroral episodes (4/7) and three were found to be colocated with auroral cavities. By applying a growth rate analysis based on JADE-E electron measurements, we show that the observed waves are driven by the Cyclotron Maser Instability from two free energy sources. The main emission, produced slightly above the electron gyrofrequency $(f_{c e})$ , is amplified by conics-type electron distribution functions (EDF) with 2–30 keV electron characteristic energies. Sporadic bursts, produced slightly below $f_{c e}$ , are driven by shell-type EDF of 0.1–10 keV. These results are analyzed comparatively to those obtained previously for Jovian hectometric and decametric emissions.

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朱诺号对木星宽带千米极光射电辐射的现场分析

在众多木星极光射电发射中，宽带千米（bKOM）分量被研究得最少。利用朱诺在极光区域的原位测量，我们调查了朱诺/波在60个第一个轨道上的无线电观测，确定了7个bKOM候选源。这些主要是在黎明风暴极光事件（4/7）中发现的，其中三个被发现与极光空洞同时发生。通过基于JADE-E电子测量的生长速率分析，我们发现观测到的波是由来自两个自由能量源的回旋脉泽不稳定性驱动的。主发射，产生略高于电子回旋频率f ce $\左（{f}_{ce}\右）$，电子特征能为2 - 30kev的圆锥型电子分布函数（EDF）放大。由0.1-10 keV的壳型EDF驱动，产生的零星爆发略低于f {f}_{ce}$。这些结果与先前获得的木星的十度和十度辐射进行了比较分析。

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来源期刊

Geophysical Research Letters 地学-地球科学综合

CiteScore

9.00

自引率

9.60%

发文量

1588

审稿时长

2.2 months

期刊介绍： Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.