Low-frequency limit of Jovian radio emissions and implications on source locations and Io plasma wake

Zarka, Philippe; Queinnec, Julien; Crary, F. J.

doi:10.1016/s0032-0633(01)00021-6

Cited by 50 publications

(51 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(9). Observations seem to favor a critical frequency ratio close to the 0.1, while theoretical work supports a critical frequency ratio close to 0.4 (Le Quéau et al 1985;Hilgers 1992;Zarka et al 2001a). Fundamental O mode or second harmonic O and X mode emission are possible also for larger frequency ratios, but are much less efficient (Treumann 2000;Zarka 2007).…”

Section: Radiation Emission In the Unipolar Interaction Modelmentioning

confidence: 89%

Predicting low-frequency radio fluxes of known extrasolar planets

Grießmeier

Zarka

Spreeuw³

2007

A&A

153

237

View full text Add to dashboard Cite

Context. Close-in giant extrasolar planets ("Hot Jupiters") are believed to be strong emitters in the decametric radio range. Aims. We present the expected characteristics of the low-frequency magnetospheric radio emission of all currently known extrasolar planets, including the maximum emission frequency and the expected radio flux. We also discuss the escape of exoplanetary radio emission from the vicinity of its source, which imposes additional constraints on detectability. Methods. We compare the different predictions obtained with all four existing analytical models for all currently known exoplanets. We also take care to use realistic values for all input parameters. Results. The four different models for planetary radio emission lead to very different results. The largest fluxes are found for the magnetic energy model, followed by the CME model and the kinetic energy model (for which our results are found to be much less optimistic than those of previous studies). The unipolar interaction model does not predict any observable emission for the present exoplanet census. We also give estimates for the planetary magnetic dipole moment of all currently known extrasolar planets, which will be useful for other studies. Conclusions. Our results show that observations of exoplanetary radio emission are feasible, but that the number of promising targets is not very high. The catalog of targets will be particularly useful for current and future radio observation campaigns (e.g. with the VLA, GMRT, UTR-2 and with LOFAR).

show abstract

Section: Radiation Emission In the Unipolar Interaction Modelmentioning

confidence: 89%

Predicting low-frequency radio fluxes of known extrasolar planets

Grießmeier

Zarka

Spreeuw³

2007

A&A

153

237

View full text Add to dashboard Cite

show abstract

“…The HOM source has been found to lie on some L-shell between 7 and 11, by Ladreiter et al (1994), and between 8 and 10 by Zarka et al (2001). Reiner et al (1993a, b), however, using direction finding and URAP data for four events taken during the Jupiter encounter, have found the HOM source to lie on L-shells 4 to 6.…”

Section: Discussionmentioning

confidence: 99%

Jovicentric latitude effect on the HOM radio emission observed by Ulysses/URAP at 5 AU from Jupiter

2002

View full text Add to dashboard Cite

Abstract. During 1994 and into 1996, Ulysses was at distances of 5 AU or more from Jupiter and travelling from south to north of the ecliptic plane between jovicentric latitudes −36 • to 20 • . Observations by the Unified Radio and Plasma Experiment (URAP) on board the Ulysses spacecraft during this period have been searched for jovian hectometric (HOM) radio events. At these distances, the HOM was only received occasionally. The signals were generally weak and much care was needed to find and to identify the events.All of the HOM events were observed when Ulysses was at jovicentric latitudes between −12.2 • ≤ D U ly ≤ 14.7 • , relatively close to the plane of the jovicentric equator. Both senses of polarization were observed with left-hand (LH) predominant. The events occurred when the jovimagnetic latitude D φ was between −8.5 • and 14.2 • and suggest that the HOM was only detectable within a beam some 23 • wide, centred on about 3 • jovimagnetic latitude. This is roughly consistent with previous work by Alexander et al. (1979) and by Leblanc (1989, 1991), based upon observations made by Voyager and other spacecraft when these were relatively close to Jupiter. The results are consistent with an emission process due to the Cyclotron-Maser instability, as suggested by a number of scientists in the past.

show abstract

“…These radio emissions are strongly modulated by Jupiter's rotation and some of them are also controlled by the orbital location of Io (Bigg 1964). The decametric, hectometric, and broadband kilometric radio emissions are generated in the polar region as part of the auroral particle acceleration processes, hence, are sometimes referred to as auroral radio emissions (Genova et al 1987(Genova et al , 1989Ladreiter et al 1994;Zarka et al 2001). Interesting emissions, likely part of the broadband kilometric radio spectrum are the 'bullseyes' reported by Kaiser and MacDowall (1998).…”

Section: Auroral Radio Emissionsmentioning

confidence: 99%

The Juno Waves Investigation

et al. 2017

View full text Add to dashboard Cite

Jupiter is the source of the strongest planetary radio emissions in the solar system. Variations in these emissions are symptomatic of the dynamics of Jupiter's magnetosphere and some have been directly associated with Jupiter's auroras. The strongest radio emissions are associated with Io's interaction with Jupiter's magnetic field. In addition, plasma waves are thought to play important roles in the acceleration of energetic particles in the magnetosphere, some of which impact Jupiter's upper atmosphere generating the auroras. Since the exploration of Jupiter's polar magnetosphere is a major objective of the Juno mission, it is appropriate that a radio and plasma wave investigation is included in Juno's payload. This paper describes the Waves instrument and the science it is to pursue as part of the Juno mission.

show abstract

Low-frequency limit of Jovian radio emissions and implications on source locations and Io plasma wake

Cited by 50 publications

References 43 publications

Predicting low-frequency radio fluxes of known extrasolar planets

Predicting low-frequency radio fluxes of known extrasolar planets

Jovicentric latitude effect on the HOM radio emission observed by Ulysses/URAP at 5 AU from Jupiter

The Juno Waves Investigation

Contact Info

Product

Resources

About