Discs of plasma around giant planets are natural laboratories that contain within mechanisms of transferring and keeping energy into the plasma and magnetic field system. Various missions to Jovian planets observed that expansion of plasmadiscs is not adiabatic and plasma temperature is increasing with radial distance. Magnetometer measurements from Juno mission were examined to determine plausibility of turbulent fluctuations as the plasma heating mechanism. Extensive azimuthal map of magnetic activity in Jupiter's nightside plasmadisc is presented. Observations show that magnetic activity is distributed asymmetrically, with active and quiet regions. This is similar to the asymmetrical distribution of activity observed in Saturn's magnetosphere. However, comprehensive study of temperature measurements showed that the only systematic change of temperature in magnetospheres of giant planets is in the radial direction. Observed breakfrequency in the magnetometer time series is systematically greater than the ion cyclotron frequency. Examination of the power spectrum points to that the kinetic energy of the corotating plasma as a source of increase of plasma temperature. This study shows that turbulent fluctuations themselves are not good candidates as a plasma heating mechanism. External pressure fluctuation however, can be used to convert kinetic energy of the plasma flow into thermal.
机构:
Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA
Princeton Univ, Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA
Southwest Res Inst, Space Sci & Engn Div, San Antonio, TX USAPrinceton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA
McComas, D. J.
Szalay, J. R.
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Southwest Res Inst, Space Sci & Engn Div, San Antonio, TX USAPrinceton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA
Szalay, J. R.
Allegrini, F.
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Southwest Res Inst, Space Sci & Engn Div, San Antonio, TX USA
Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX USAPrinceton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA
Allegrini, F.
Bagenal, F.
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Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USAPrinceton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA
Bagenal, F.
Connerney, J.
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Goddard Space Flight Ctr, Greenbelt, MD USAPrinceton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA
Connerney, J.
Ebert, R. W.
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Southwest Res Inst, Space Sci & Engn Div, San Antonio, TX USAPrinceton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA
Ebert, R. W.
Kurth, W. S.
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Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USAPrinceton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA
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Planetary Sci Inst, Tucson, AZ USAPrinceton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA
Thomsen, M. F.
Valek, P.
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Southwest Res Inst, Space Sci & Engn Div, San Antonio, TX USA
Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX USAPrinceton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA
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Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA
Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USAUniv Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA
Wang, Jian-Zhao
Bagenal, Fran
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Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USAUniv Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA
Bagenal, Fran
Wilson, Robert J.
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Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USAUniv Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA
Wilson, Robert J.
Nerney, Edward
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Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USAUniv Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA
Nerney, Edward
Ebert, Robert W.
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Southwest Res Inst, San Antonio, TX USA
Univ Texas San Antonio, San Antonio, TX USAUniv Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA
Ebert, Robert W.
Valek, Philip W.
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Southwest Res Inst, San Antonio, TX USAUniv Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA
Valek, Philip W.
Allegrini, Frederic
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Southwest Res Inst, San Antonio, TX USA
Univ Texas San Antonio, San Antonio, TX USAUniv Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA