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Imaging Jupiter's radiation belts down to 127 MHz with LOFAR
- Source :
- Astronomy & Astrophysics, 587, March, pp. 1-11, Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, 2016, 587, pp.A3. ⟨10.1051/0004-6361/201527518⟩, Astronomy and Astrophysics-A&A, EDP Sciences, 2016, 587, pp.A3. ⟨10.1051/0004-6361/201527518⟩, Astronomy & Astrophysics, 587, 1-11, Astronomy and Astrophysics, Astronomy & astrophysics, 587(A3), 1-11. EDP Sciences, Astronomy & Astrophysics, 587, A3, NASA Astrophysics Data System, Astronomy and astrophysics, 587(March 2016):A3. EDP Sciences, Breton, R, {Girard}, J N, {Zarka}, P, {Tasse}, C, {Hess}, S, {de Pater}, I, {Santos-Costa}, D, {Nenon}, Q, {Sicard}, A, {Bourdarie}, S, {Anderson}, J, {Asgekar}, A, {Bell}, M E, {van Bemmel}, I, {Bentum}, M J, {Bernardi}, G, {Best}, P, {Bonafede}, A, {Breitling}, F, {Broderick}, J W, {Brouw}, W N, {Brüggen}, M, {Ciardi}, B, {Corbel}, S, {Corstanje}, A, {de Gasperin}, F, {de Geus}, E, {Deller}, A, {Duscha}, S, {Eislöffel}, J, {Falcke}, H, {Frieswijk}, W, Garrett, M, {Grie{\ss}meier}, J, {Gunst}, A W, {Hessels}, J W T, {Hoeft}, M, {Hörandel}, J, {Iacobelli}, M, {Juette}, E, {Kondratiev}, V I, {Kuniyoshi}, M, {Kuper}, G, {van Leeuwen}, J, {Loose}, M, {Maat}, P, {Mann}, G, {Markov}, S, {McFadden}, R, {McKay-Bukowski}, D, {Moldon}, J, {Munk}, H, {Nelles}, A, {Norden}, M J, {Orru}, E, {Paas}, H, {Pandey-Pommier}, M, {Pizzo}, R, {Polatidis}, A G, {Reich}, W, {Röttgering}, H, {Rowlinson}, A, {Schwarz}, D, {Smirnov}, O, {Steinmetz}, M, {Swinbank}, J, {Tagger}, M, {Thoudam}, S, {Toribio}, M C, {Vermeulen}, R, {Vocks}, C, {van Weeren}, R J, {Wijers}, R A M J & {Wucknitz}, O 2015, ' Imaging Jupiter's radiation belts down to 127 MHz with LOFAR ', Astronomy & Astrophysics . https://doi.org/10.1051/0004-6361/201527518, Astronomy & Astrophysics, 587:A3. EDP Sciences
- Publication Year :
- 2015
-
Abstract
- Context. Observing Jupiter's synchrotron emission from the Earth remains today the sole method to scrutinize the distribution and dynamical behavior of the ultra energetic electrons magnetically trapped around the planet (because in-situ particle data are limited in the inner magnetosphere). Aims. We perform the first resolved and low-frequency imaging of the synchrotron emission with LOFAR at 127 MHz. The radiation comes from low energy electrons (~1-30 MeV) which map a broad region of Jupiter's inner magnetosphere. Methods (see article for complete abstract) Results. The first resolved images of Jupiter's radiation belts at 127-172 MHz are obtained along with total integrated flux densities. They are compared with previous observations at higher frequencies and show a larger extent of the synchrotron emission source (>=4 $R_J$). The asymmetry and the dynamic of east-west emission peaks are measured and the presence of a hot spot at lambda_III=230 {\deg} $\pm$ 25 {\deg}. Spectral flux density measurements are on the low side of previous (unresolved) ones, suggesting a low-frequency turnover and/or time variations of the emission spectrum. Conclusions. LOFAR is a powerful and flexible planetary imager. The observations at 127 MHz depict an extended emission up to ~4-5 planetary radii. The similarities with high frequency results reinforce the conclusion that: i) the magnetic field morphology primarily shapes the brightness distribution of the emission and ii) the radiating electrons are likely radially and latitudinally distributed inside about 2 $R_J$. Nonetheless, the larger extent of the brightness combined with the overall lower flux density, yields new information on Jupiter's electron distribution, that may shed light on the origin and mode of transport of these particles.<br />Comment: 10 pages, 12 figures, accepted for publication in A&A (27/11/2015) - abstract edited because of limited characters
- Subjects :
- radio continuum: planetary systems
Brightness
010504 meteorology & atmospheric sciences
radio continuum: planetary
EWI-27447
Astronomy
Astrophysics::High Energy Astrophysical Phenomena
Magnetosphere
FOS: Physical sciences
Astrophysics
Electron
METIS-321662
7. Clean energy
01 natural sciences
Jupiter
symbols.namesake
0103 physical sciences
Emission spectrum
IR-103183
010303 astronomy & astrophysics
Instrumentation and Methods for Astrophysics (astro-ph.IM)
0105 earth and related environmental sciences
Physics
Earth and Planetary Astrophysics (astro-ph.EP)
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]
Radio continuum: planetary system
Planets and satellites: magnetic field
Astronomy and Astrophysics
LOFAR
Astronomy and Astrophysic
planets and satellites: magnetic fields
Spectral flux density
13. Climate action
Space and Planetary Science
Van Allen radiation belt
Techniques: interferometric
symbols
ComputingMethodologies_DOCUMENTANDTEXTPROCESSING
systems
Astrophysics::Earth and Planetary Astrophysics
Astrophysics - Instrumentation and Methods for Astrophysics
Astrophysics - Earth and Planetary Astrophysics
Subjects
Details
- Language :
- English
- ISSN :
- 00046361 and 14320746
- Database :
- OpenAIRE
- Journal :
- Astronomy & Astrophysics, 587, March, pp. 1-11, Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, 2016, 587, pp.A3. ⟨10.1051/0004-6361/201527518⟩, Astronomy and Astrophysics-A&A, EDP Sciences, 2016, 587, pp.A3. ⟨10.1051/0004-6361/201527518⟩, Astronomy & Astrophysics, 587, 1-11, Astronomy and Astrophysics, Astronomy & astrophysics, 587(A3), 1-11. EDP Sciences, Astronomy & Astrophysics, 587, A3, NASA Astrophysics Data System, Astronomy and astrophysics, 587(March 2016):A3. EDP Sciences, Breton, R, {Girard}, J N, {Zarka}, P, {Tasse}, C, {Hess}, S, {de Pater}, I, {Santos-Costa}, D, {Nenon}, Q, {Sicard}, A, {Bourdarie}, S, {Anderson}, J, {Asgekar}, A, {Bell}, M E, {van Bemmel}, I, {Bentum}, M J, {Bernardi}, G, {Best}, P, {Bonafede}, A, {Breitling}, F, {Broderick}, J W, {Brouw}, W N, {Brüggen}, M, {Ciardi}, B, {Corbel}, S, {Corstanje}, A, {de Gasperin}, F, {de Geus}, E, {Deller}, A, {Duscha}, S, {Eislöffel}, J, {Falcke}, H, {Frieswijk}, W, Garrett, M, {Grie{\ss}meier}, J, {Gunst}, A W, {Hessels}, J W T, {Hoeft}, M, {Hörandel}, J, {Iacobelli}, M, {Juette}, E, {Kondratiev}, V I, {Kuniyoshi}, M, {Kuper}, G, {van Leeuwen}, J, {Loose}, M, {Maat}, P, {Mann}, G, {Markov}, S, {McFadden}, R, {McKay-Bukowski}, D, {Moldon}, J, {Munk}, H, {Nelles}, A, {Norden}, M J, {Orru}, E, {Paas}, H, {Pandey-Pommier}, M, {Pizzo}, R, {Polatidis}, A G, {Reich}, W, {Röttgering}, H, {Rowlinson}, A, {Schwarz}, D, {Smirnov}, O, {Steinmetz}, M, {Swinbank}, J, {Tagger}, M, {Thoudam}, S, {Toribio}, M C, {Vermeulen}, R, {Vocks}, C, {van Weeren}, R J, {Wijers}, R A M J & {Wucknitz}, O 2015, ' Imaging Jupiter's radiation belts down to 127 MHz with LOFAR ', Astronomy & Astrophysics . https://doi.org/10.1051/0004-6361/201527518, Astronomy & Astrophysics, 587:A3. EDP Sciences
- Accession number :
- edsair.doi.dedup.....1dbe08d4ce4ac1828ccf844fb0e74584