Universität zu Köln

Saur, Joachim ORCID: 0000-0003-1413-1231, Janser, Sascha, Schreiner, Anne, Clark, George, Mauk, Barry H., Kollmann, Peter ORCID: 0000-0002-4274-9760, Ebert, Robert W., Allegrini, Frederic ORCID: 0000-0003-0696-4380, Szalay, Jamey R. and Kotsiaros, Stavros (2018). Wave-Particle Interaction of Alfven Waves in Jupiter's Magnetosphere: Auroral and Magnetospheric Particle Acceleration. J. Geophys. Res-Space Phys., 123 (11). S. 9560 - 9574. WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 2169-9402

Full text not available from this repository.

Abstract

We investigate spatial and temporal scales at which wave-particle interaction of Alfven waves occurs in Jupiter's magnetosphere. We consider electrons, protons, and oxygen ions and study the regions along magnetic flux tubes where the plasma is the densest, that is, the equatorial plasma sheet, and where the plasma is the most dilute, that is, above the ionosphere, where auroral particle acceleration is expected to occur. We find that within a dipole L-shell of roughly 30, the electron inertial length scale in the auroral region is the dominating scale, suggesting that electron Landau damping of kinetic Alfven waves can play an important role in converting field energy into auroral particle acceleration. This mechanism is consistent with the broadband bidirectional electron distributions frequently observed by Juno. Due to interchange-driven mass transport in Jupiter's magnetosphere, its magnetosphere-ionosphere coupling is expected to be mostly not in local force balance. This might be a key reason for the dominant role of Alfvenically driven stochastic acceleration compared to the less frequently occurring, locally forced-balanced, and thus static mono-energetic unidirectional acceleration. Outside of approximately L = 30, the ion gyroperiod is the dominating scale suggesting that ion cyclotron damping of heavy ions plays a major role in heating magnetospheric plasma. We also present properties of the dispersion relationship and the polarization relationships of kinetic Alfven waves including the important effects from the relativistic correction due to the displacement current in Ampere's law.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Saur, Joachim UNSPECIFIED orcid.org/0000-0003-1413-1231 UNSPECIFIED Janser, Sascha UNSPECIFIED UNSPECIFIED UNSPECIFIED Schreiner, Anne UNSPECIFIED UNSPECIFIED UNSPECIFIED Clark, George UNSPECIFIED UNSPECIFIED UNSPECIFIED Mauk, Barry H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kollmann, Peter UNSPECIFIED orcid.org/0000-0002-4274-9760 UNSPECIFIED Ebert, Robert W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Allegrini, Frederic UNSPECIFIED orcid.org/0000-0003-0696-4380 UNSPECIFIED Szalay, Jamey R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kotsiaros, Stavros UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-167091
DOI:	10.1029/2018JA025948
Journal or Publication Title:	J. Geophys. Res-Space Phys.
Volume:	123
Number:	11
Page Range:	S. 9560 - 9574
Date:	2018
Publisher:	AMER GEOPHYSICAL UNION
Place of Publication:	WASHINGTON
ISSN:	2169-9402
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ELECTRON-BEAMS; MIDDLE MAGNETOSPHERE; CURRENT SYSTEM; POLAR-REGIONS; SOLAR-WIND; TURBULENCE; IO; PLASMA; FOOTPRINTS; ENERGIES Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/16709