The Beaming Structures of Jupiter’s Decametric Common S-Bursts Observed From the Lwa1, Nda, and Uran2 Radio Telescopes

Imai, Masafumi; Lecacheux, A.; Higgins, C. A.; Panchenko, M.; Dowell, Jayce; Imai, Kazumasa; Браженко, А. И.; Frantsuzenko, A. V.; Konovalenko, A. A.

doi:10.3847/0004-637x/826/2/176

Cited by 36 publications

(19 citation statements)

References 17 publications

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“…The sources of these nonthermal emissions are distributed along auroral magnetic field lines at emission frequencies very close to the local electron cyclotron frequency, f ce (Imai et al, 2017a(Imai et al, , 2017bKurth, Imai, Hospodarsky, Gurnett, Louarn, et al, 2017;Kurth, Imai, Hospodarsky, Gurnett, Tetrick, et al, 2017). These sporadic bursts are believed to be the free space right-hand extraordinary (R-X) mode at various temporal scales from minutes down to milliseconds (Carr et al, 1983;Imai et al, 2016;Kurth et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Probing Jovian Broadband Kilometric Radio Sources Tied to the Ultraviolet Main Auroral Oval With Juno

Imai

Greathouse

Kurth

et al. 2019

Geophysical Research Letters

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Observations of Jovian broadband kilometric (bKOM) radiation and ultraviolet (UV) auroras were acquired with the Waves and Juno‐UVS instruments for ∼2 hr over the northern and southern polar regions during Juno's perijoves 4, 5, and 6 passes (PJ4, PJ5, and PJ6). During all six time periods, Juno traversed auroral magnetic field lines connecting to the UV main auroral ovals, matching the estimates of bKOM radio source footprints. The localized bKOM radio sources for the PJ4 north pass map to magnetic field lines having distances of 10 to 12 Jovian radii ( R J ) at the magnetic equator, whereas the extended bKOM radio sources for the other events map to field lines extending to 20–61 R J . We found the peak bKOM intensities during Juno's potential radio source crossings show positive, negative, and no correlations with the UV main oval brightness and color ratio. Only the positive correlations suggest wave‐particle energy transport.

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Section: Introductionmentioning

confidence: 99%

Probing Jovian Broadband Kilometric Radio Sources Tied to the Ultraviolet Main Auroral Oval With Juno

Imai

Greathouse

Kurth

et al. 2019

Geophysical Research Letters

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“…These plots show that the flashlightlike beaming model fits well to the observed values. Based on these observations, Imai et al [2016] were further able to conclude that the S-burst has a minimum beaming (cone) thickness of 2.66" (i.e., the angular size estimated from the maximum baseline at LWA1-URAN2) in the east-west direction projected on Jupiter. Imai et al [2016], reproduced by permission of the AAS.…”

Section: S-burst Beaming Mechanismmentioning

confidence: 95%

“…We have made simultaneous observations with the LWA1, the Nançay Decameter Array [Boischot et al, 1980;Lecacheux, 2000, NDA, in Nançay, France], and URAN2 [Brazhenko et al, 2005, located in Poltava, Ukraine] to undertake a cross-correlation analysis of Sbursts over baselines up to 8640 km [Imai et al, 2016]. Using 105 minutes of data, we have measured time lags of S-bursts using a cross-correlation analysis of the spectrograms from all three instruments.…”

Section: S-burst Beaming Mechanismmentioning

confidence: 99%

Jovian decametric emission with the Long Wavelength Array station 1 (LWA1)

Higgins¹,

Imai²,

Imai³

2018

Planetary Radio Emissions Viii

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The Long Wavelength Array Station 1 (LWA1) is located in central New Mexico, USA. It consists of 256 pairs of 'droopy-dipole' antennas operating between 10 and 88 MHz. The antennas are distributed in a pseudo-random layout across a 110 m × 100 m region. Observations with the LWA1 are based on peer reviewed proposals for open-skies observing time. LWA1 is an excellent planetary radio emission instrument due to its sensitivity and the low radio frequency interference environment where it is located. We have undertaken several Jovian observing campaigns using the LWA1. We show that LWA1 data provide excellent spectral detail in Jovian decametric emission such as simultaneous left hand circular (LHC) and right hand circular (RHC) polarized Io-related arcs and source envelopes, modulation lane features, S-bursts structures, narrow band N-events, and apparent interactions between S-bursts and N-events. The start of the LHC Io-C source region was traced to earlier longitudes than typically found in the literature. Early LWA1 observations revealed a wealth of Io-D emission, including detection of rare S-bursts during an Io-D event. These initial results have led to new programs to explore the spectral characteristics of Io-D events, investigate modulation lanes of Io-B/Io-C events and examine the beaming structure of S-bursts combining LWA1, NDA, and URAN2. In addition, LWA1 is one of the ground-based support facilities for the NASA JUNO 1 mission.

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“…Another example of simultaneous observations of Jovian decameter emission is described in the paper by Imai et al [2016]. Three radio telescopes were used in that study: LWA-1 (USA), NDA (France), and URAN-2 (Ukraine).…”

Section: A) B)mentioning

confidence: 99%

Multi-antenna observations in the low-frequency radio astronomy of solar system objects and related topics studies

2018

Planetary Radio Emissions Viii

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Rapid progress currently takes place in the field of low-frequency radio astronomy in the meter-decameter-hectometer range of wavelengths. It is caused by a radical modernization of the existing radio telescopes, creation of a new generation of instruments, space-borne observations, and by the development of research on all classes of astrophysical objects, including the Solar System. On the other hand, a range of difficulties specific to low-frequency radio astronomy is known, which are caused by technical, methodological, and physical limitations. An effective strategy

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The Beaming Structures of Jupiter’s Decametric Common S-Bursts Observed From the Lwa1, Nda, and Uran2 Radio Telescopes

Cited by 36 publications

References 17 publications

Probing Jovian Broadband Kilometric Radio Sources Tied to the Ultraviolet Main Auroral Oval With Juno

Probing Jovian Broadband Kilometric Radio Sources Tied to the Ultraviolet Main Auroral Oval With Juno

Jovian decametric emission with the Long Wavelength Array station 1 (LWA1)

Multi-antenna observations in the low-frequency radio astronomy of solar system objects and related topics studies

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