Results of decametric monitoring of the comet collision with Jupiter

Carr, T. D.; Reyes, F.; Phillips, J. A.; May, J.; Wang, L.; Aparici, J.; Álvarez, H.; Olmos, F.; Garcia, L. N.; Buizer, James M. De; Greenman, W. B.; Clark, Tom; Levy, J.; Padin, S.; Higgins, C. A.

doi:10.1029/95gl00388

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…It is quite interest that the Maeda et al's data still show a systematic results indicating the Jovian source when we take long integration time with running average of 1 minute. Carr et al (1995) have reported that the observations of the Jovian decameter wave radiation had been made covering the periods of Jovian magnetosphere passages of SL-9 fragments; the observations were made at Maipu Radio Astronomy Observatory of the University of Chile, the University of Florida Radio Observatory, and the Owen Valley Radio Observatory of the California Institute of Technology. About 11 frequencies were monitored ranging from 16.7 to 32 MHz; but observations were met interference problems (Can et al, 1994).…”

Section: Why the Other Stations Did Not Report?mentioning

confidence: 99%

Extremely Large Enhancements of the Jovian Decameter Radio Bursts Caused by the Magnetosphere-Plasmasphere Passages of Shoemaker-Levy 9 Comet Fragments-Evolution of Jovian Decametric Radiation Feature into the State of Intense Decametric Pulsar

Oya

Iizima

Morioka

et al. 1997

J. geomagn. geoelec

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Observation results of the Jovian decameter wave emissions in the period of the passages of fragments of Shoemaker-Levy 9 comet through the Jovian magnetosphere indicated extremely large enhancements of Jovian decameter wave radiations (JDR), being caused by dust-plasma clouds moving across the Jovian magnetic fields. The total emission power of the decameter wave radiations was increased to the level of approximately 10 times larger than the regular maximum level of the emissions of the Jovian decameter radiation in a corresponding frequency range. The Jovian decameter wave radiations have continuously been emitted for six months, long after the passage of the fragments of Shoemaker-Levy 9 comet; the evidence suggests that the Jovian plasma environment has been completely changed by the remnants of dust clouds that were left behind the Shoemaker-Levy 9 comet fragments. IntroductionFrom 20:11 UT on July 16, 1994 to 08:05 UT on July 22, 1994 the succeeded collisions of the fragments of Shoemaker-Levy 9 had taken place. Since the prediction of the collision event, possible effects of the fragments of the Shoemaker-Levy 9 comet approaching to Jupiter on the enhancements of the Jovian decameter wave radiations (JDR) have been considered in three phases (Oya et al., private communication at the autumn meeting of the Japanese Society of Planetary Science, 1993). These are phases of the passage of fragments through the magnetosphere, the phase of the passage through the plasmasphere and the last phase of crashing into the dense Jovian atmosphere; the interaction of the fragments with the Jovian magnetic field, being surrounded by dusts and plasma, may generate the electric field whose effects can be transported down into the polar region ionosphere inducing the electric currents where some parts of the energy may be transformed into the energy of decameter radio waves. Several predictions have been published relating to the enhancements of Jovian decameter wave radiations mainly for the magnetosphere interaction of cometgenic plasma and dust (Ip and Prange, 1994;Farrell et al., 1994;Bolin and Brenning, 1994).The observations of Jovian decameter wave radiations have been made in the observation stations of the Tohoku University Jovian Decameter Radiation Observatory (TU-JDO). The system of TU-JDO have been developed during past 20 years (Oya and Morioka, 1979;Oya et al., 1984) and have been made current observations; being based on this background, special campaign activities for the event of the SL-9 comet collision with Jupiter have been carried out in a period after July 14, 1994. The present paper is purposed to report the first results of the Shoemaker-Levy 9 effects on JDR from the TU-JDO observation data which indicated extremely large enhancements of JDR in the phases of the passages of the cometary fragments through the magnetosphere and plasmasphere; and there have been continued serious remaining effects long after the collisions due to the possible passages of dust clouds through the Jovian plasma environmen...

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Section: Why the Other Stations Did Not Report?mentioning

confidence: 99%

Extremely Large Enhancements of the Jovian Decameter Radio Bursts Caused by the Magnetosphere-Plasmasphere Passages of Shoemaker-Levy 9 Comet Fragments-Evolution of Jovian Decametric Radiation Feature into the State of Intense Decametric Pulsar

Oya

Iizima

Morioka

et al. 1997

J. geomagn. geoelec

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“…The lo plasma torus is one of the source regions of the KOM radiation, and this is consistent with our results. On the other hand, Carr et al (1995) concluded from ground-based monitoring observations that there was no significant change in the Jovian decametric emission activity before, during, and after the impact period. This is consistent with our results, "The turbulence in the Jovian outer magnetosphere was weak.…”

Section: Discussionmentioning

confidence: 99%

“…This conclusion is consistent with no significant change of the DAM radiation monitored on the ground (cf. Carr et al, 1995).…”

Section: Discussionmentioning

confidence: 99%

Search for Jovian Hectometric and Kilometric Radiation by GEOTAIL Spacecraft during the Impact of Comet Shoemaker-Levy 9.

Kasaba

Kojma

Matsumoto

et al. 1996

J. geomagn. geoelec

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We made a survey for Jovian hectometric and kilometric radiation by GEOTAIL spacecraft before, during, and after the impacts of Comet Shoemaker-Levy 9 (SL-9). We attempted to identify the radiation from Jupiter based on a k vector determination. However, we did not find clear enhancement of the Jovian radiation activity in the whole period nor around each impact time.With regard to the Jovian magnetospheric activity, the enhancement of synchrotron and X-ray radiation in association with the SL-9 event has been already reported. Synchrotron radiation increased during the week of the impacts, and X-rays was clearly detected just around K impact time at the magnetic conjugate footprints of the impact sites. This suggests that a strong perturbation at the impact sites has given non negligible change in the inner magnetosphere directly or indirectly. Our results suggest that such activities were limited in the inner magnetosphere only on low L shells, and there were few amount of direct coupling between the cometary fragments and the Jovian outer magnetosphere. This is consistent with the ground-based observation of the decametric radiation that no significant change was detected during the SL-9 event.

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Synthesis of magnetospheric radio emissions during and after the Jupiter/SL-9 collision

Leblanc

Sault

Dulk

1997

Planetary and Space Science

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Results of decametric monitoring of the comet collision with Jupiter

Cited by 7 publications

References 2 publications

Extremely Large Enhancements of the Jovian Decameter Radio Bursts Caused by the Magnetosphere-Plasmasphere Passages of Shoemaker-Levy 9 Comet Fragments-Evolution of Jovian Decametric Radiation Feature into the State of Intense Decametric Pulsar

Extremely Large Enhancements of the Jovian Decameter Radio Bursts Caused by the Magnetosphere-Plasmasphere Passages of Shoemaker-Levy 9 Comet Fragments-Evolution of Jovian Decametric Radiation Feature into the State of Intense Decametric Pulsar

Search for Jovian Hectometric and Kilometric Radiation by GEOTAIL Spacecraft during the Impact of Comet Shoemaker-Levy 9.

Synthesis of magnetospheric radio emissions during and after the Jupiter/SL-9 collision

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