scholarly journals Latitudinal beaming of Jupiter's low frequency radio emissions

1979 ◽  
Vol 84 (A9) ◽  
pp. 5167 ◽  
Author(s):  
J.K. Alexander ◽  
M.D. Desch ◽  
M.L. Kaiser ◽  
J.R. Thieman
Keyword(s):  
Low Frequency ◽  
Radio Emissions

New remote radio observations of Jupiter by Parker Solar Probe

2020 ◽  
Author(s):  
Alain Lecacheux ◽  
Stuart D. Bale ◽  
Milan Maksimovic ◽  
Marc Pulupa
Keyword(s):  
Low Frequency ◽  
Dynamic Spectrum ◽  
Plasma Structure ◽  
The Sun ◽  
Radio Observations ◽  
Inner Magnetosphere ◽  
Radio Emissions

<p>The FIELDS/RFS experiment aboard the Parker Solar Probe spacecraft, in orbit around the Sun, is able to detect and remotely study low frequency radio emissions from Jupiter. Accurate measurements of the intensity and polarisation of those emissions (mainly the HOM/DAM components) were obtained throughout years 2018 and 2019. They are compared to similar ones, obtained 20 years ago, during Cassini’s remote flyby of Jupiter. A particular emphasis is brought on the so-called “attenuation bands” phenomenon, - a well-defined intensity extinction/enhancement feature modulating the HOM dynamic spectrum -, which likely results from the radiation propagating to the observer through some permanent or long lived plasma structure (not firmly identified so far) lying in the rotating Jovian inner magnetosphere.</p>

scholarly journals A Study of Ionospherics at Macquarie Island

1961 ◽  
Vol 14 (2) ◽  
pp. 218 ◽  
Author(s):  
BA McInnes
Keyword(s):  
Diurnal Variation ◽  
Low Frequency ◽  
Geomagnetic Disturbance ◽  
Strong Correlations ◽  
Energy Distributions ◽  
Emission Frequency ◽  
Radio Emissions ◽  
Macquarie Island ◽  
K Index ◽  
Ionospheric Absorption

Very low frequency radio emissions of natural origin, sometimes known as iono. spherics, recorded at Macquarie Island have been examined and grouped into classes. The diurnal variations of all classes show a non�uniform distribution with a peak shortly before local midday. The ionospherics appeared to fall into three groups as regards dependence on magnetic K�index. Strong correlations were discovered between values of emission frequency and K.index, for several classes of ionospherics. The roleof Cerenkov radiation in the generation of ionospherics is discussed. Suggested energy distributions are put forward to explain various classes of ionospherics. The magnetic associations and diurnal variation are explained on the basis of current geomagnetic disturbance theory. Ionospheric absorption is also considered to affect the diurnal variation. The phenomenon of" surf", as reported by Campbell and Pope, is discussed.

scholarly journals Low-frequency ionospheric sounding with Narrow Bipolar Event lightning radio emissions: energy-reflectivity spectrum

2008 ◽  
Vol 26 (7) ◽  
pp. 1793-1803 ◽  
Author(s):  
A. R. Jacobson ◽  
R. Holzworth ◽  
X.-M. Shao
Keyword(s):  
Lightning Discharge ◽  
Low Frequency ◽  
Lower Ionosphere ◽  
Angle Of Incidence ◽  
Radio Emissions ◽  
Statistical Variation ◽  
Reflection Height ◽  
D Region ◽  
Relationship Of ◽  
The Relationship

Abstract. We analyze data on radio-reflection from the D-region of the lower ionosphere, retrieving the energy-reflection coefficient in the frequency range ~5–95 kHz. The data are the same as developed for a recent study of ionospheric-reflection height, and are based on recordings of powerful (multi-Gigawatt) radio emissions from a type of narrow (~10 μs) lightning discharge known as "Narrow Bipolar Events". The sequential appearance of first the groundwave signal, and then the ionospheric single-hop reflection signal, permits us to construct the energy-reflection ratio. We infer the energy reflection's statistical variation with solar zenith angle, angle-of-incidence, frequency, and propagation azimuth. There is also a marginally-significant response of the energy reflectivity to solar X-ray flux density. Finally, we review the relationship of our results to previous published reports.

Low-frequency radio emissions at Neptune

1990 ◽  
Vol 17 (10) ◽  
pp. 1649-1652 ◽  
Author(s):  
W. S. Kurth ◽  
D. D. Barbosa ◽  
D. A. Gurnett ◽  
R. L. Poynter ◽  
I. H. Cairns
Keyword(s):  
Low Frequency ◽  
Radio Emissions

Correction to “Low-frequency radio emissions in the outer heliosphere: Constraints on emission processes”

1991 ◽  
Vol 96 (A4) ◽  
pp. 5883 ◽  
Author(s):  
W. M. Macek ◽  
I. H. Cairns ◽  
W. S. Kurth ◽  
D. A. Gurnett
Keyword(s):  
Low Frequency ◽  
Outer Heliosphere ◽  
Radio Emissions

scholarly journals The low-frequency source of Saturn’s kilometric radiation

Science ◽  
2018 ◽  
Vol 362 (6410) ◽  
pp. eaat2027 ◽  
Author(s):  
L. Lamy ◽  
P. Zarka ◽  
B. Cecconi ◽  
R. Prangé ◽  
W. S. Kurth ◽  
...  
Keyword(s):  
Source Region ◽  
Low Frequency ◽  
Auroral Oval ◽  
Emission Region ◽  
Radio Emissions ◽  
Cyclotron Maser ◽  
Frequency Source ◽  
Field Lines ◽  
Plasma Measurements

Understanding how auroral radio emissions are produced by magnetized bodies requires in situ measurements within their source region. Saturn’s kilometric radiation (SKR) has been widely used as a remote proxy of Saturn’s magnetosphere. We present wave and plasma measurements from the Cassini spacecraft during its ring-grazing high-inclination orbits, which passed three times through the high-altitude SKR emission region. Northern dawn-side, narrow-banded radio sources were encountered at frequencies of 10 to 20 kilohertz, within regions of upward currents mapping to the ultraviolet auroral oval. The kilometric waves were produced on the extraordinary mode by the cyclotron maser instability from 6– to 12–kilo–electron volt electron beams and radiated quasi-perpendicularly to the auroral magnetic field lines. The SKR low-frequency sources appear to be strongly controlled by time-variable magnetospheric electron densities.

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