A theory of the terrestrial kilometric radiation

Wu, Chao; Lee, L. C.

doi:10.1086/157120

Cited by 920 publications

(691 citation statements)

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“…Several different types of radio emissions can be seen in this spectrogram, but the most prominent are the distinct arc-like features from about 0.5 to 16 MHz. These arc-like features were ®rst clearly seen during the Voyager 1¯y-by of Jupiter 9 , and are believed to be generated at the local electron cyclotron frequency via the cyclotron maser mechanism 10 , which produces radiation nearly perpendicular to the local magnetic ®eld. Usually, two types of arcs can be identi®ed, those associated with Jupiter's moon Io 11 , labelled Io-controlled', and those not associated with Io.…”

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confidence: 95%

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Control of Jupiter's radio emission and aurorae by the solar wind

Gurnett¹,

Kurth²,

Hospodarsky³

et al. 2002

Nature

171

136

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confidence: 95%

“…altitudes (1 to 3 planetary radii) 14,21 by the cyclotron maser mechanism 10,22 . No in situ measurements are available in the highlatitude auroral regions of the jovian magnetosphere, so we use our knowledge of terrestrial auroral processes to help us to understand the processes that are occurring in the jovian magnetosphere.…”

mentioning

confidence: 99%

Control of Jupiter's radio emission and aurorae by the solar wind

Gurnett¹,

Kurth²,

Hospodarsky³

et al. 2002

Nature

171

136

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“…The observation of a 39.5 MHz high-frequency cutoff in the DAM was early evidence that Jupiter's cloud top magnetic field strength must be near 14 G, a fact later confirmed by Pioneer 10 (Acuna& Ness 1976; Smith, Davis, & Jones 1976). The extraordinary radiated power of the decametric emission, upward of 10 13 W, is explained by a maser-induced radiation process known as the electron cyclotron maser (Wu & Lee 1979;Melrose & Dulk 1982). An important feature of the DAM from the standpoint of particle acceleration processes is the fact that much of the emission is driven by Jupiter's innermost Galilean satellite, Io.…”

Section: Introductionmentioning

confidence: 99%

Jupiter Radio Bursts and Particle Acceleration

Desch¹

1994

International Astronomical Union Colloquium

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Particle acceleration processes are important in understanding many of the Jovian radio and plasma wave emissions. However, except for the high-energy electrons that generate synchrotron emission following inward diffusion from the outer magnetosphere, acceleration processes in Jupiter's magnetosphere and between Jupiter and Io are poorly understood. We discuss very recent observations from the Ulysses spacecraft of two new Jovian radio and plasma wave emissions in which particle acceleration processes are important and have been addressed directly by complementary investigations. First, radio bursts known as quasi-periodic bursts have been observed in close association with a population of highly energetic electrons. Second, a population of much lower energy (keV range) electrons on auroral field lines can be shown to be responsible for the first observation of a Jovian plasma wave emission known as auroral hiss.

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“…The familiar relativistic gamma factor, g = (1 − v R 2 /c 2 ) −1/2 , is approximately equal to 1 for most instances in the aurora (energies below ∼MeV); however, as shown by Wu and Lee [1979] and Melrose [1976], this factor can significantly influence wave growth even for nonrelativistic electrons. The Landau resonance (n = 0) can be thought of as the condition where the parallel velocity of the resonant particle is equal to the parallel phase velocity of the wave (w/k k ).…”

Section: Resonance Conditionsmentioning

confidence: 99%

Theoretical constraints on the generation mechanism of auroral medium frequency burst radio emissions

et al. 2011

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[1] Auroral medium frequency (MF) burst is an impulsive auroral radio emission observed at ground level between ∼1.3 and 4.5 MHz for a few minutes at substorm onsets. Despite multiple suggested theories, the exact generation mechanism for MF burst remains unknown. The foremost theory suggests that MF burst originates from Langmuir or upper hybrid waves excited over a range of altitudes in the bottomside or topside F region, which linearly mode convert to the electromagnetic LO mode, gaining access to ground level. Analysis of plasmas with two electron components implies the existence of additional normal modes, commonly referred to as the electron acoustic (EA) and electron cyclotron sound (ECS) modes, which have been suggested to potentially play a role in the generation of MF burst. Analytical calculations using Waves in Homogeneous, Anisotropic Multicomponent Plasmas, or WHAMP, and other dispersion-solving calculations are applied to applicable ionospheric normal modes (RX, LO, Langmuir or upper hybrid, EA, and ECS), compared to previous results, and applied to MF burst and the auroral plasma environment. Computation of resonant parallel energies suggests that, in the presence of an auroral electron distribution, instability of EA, ECS, LX, and Langmuir or upper hybrid modes is possible. The same analysis suggests that LO and RX modes are unlikely to be directly excited. Excitation of the EA or ECS mode in the frequency range applicable to MF burst is found to be more favorable for higher ionospheric plasma densities ( f pe /f ce > 2.36) and higher secondary electron temperatures (T h ≈ 100s of eV). Growth rate calculations suggest that growth of the EA or ECS mode is excitable by the auroral electron beam with higher growth rates for the ECS mode.

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A theory of the terrestrial kilometric radiation

Cited by 920 publications

References 1 publication

Control of Jupiter's radio emission and aurorae by the solar wind

Control of Jupiter's radio emission and aurorae by the solar wind

Jupiter Radio Bursts and Particle Acceleration

Theoretical constraints on the generation mechanism of auroral medium frequency burst radio emissions

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