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MMS Observations of Intense Whistler Waves Within Earth's Supercritical Bow Shock: Source Mechanism and Impact on Shock Structure and Plasma Transport
Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA..
Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA.;LATMOS IPSL UVSQ CNRS, Guyancourt, France..
Univ Paris 06, Lab Phys Plasmas, UPMC, Ecole Polytech,Univ Paris Sud,UMR7648,CNRS, Paris, France..
NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA..
Vise andre og tillknytning
2020 (engelsk)Inngår i: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 125, nr 7Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The properties of whistler waves near lower-hybrid frequencies within Earth's quasi-perpendicular bow shock are examined using data from the Magnetospheric Multiscale (MMS) mission. These waves appear as right-hand polarized wave packets propagating upstream obliquely to the magnetic field and shock normal with phase speeds from a few hundred up to 1,600 km/s. The wavelengths are near the ion inertial length scale (lambda similar to 0.3-1.3 lambda(i)). Detailed analysis finds characteristics consistent with the modified two-stream instability mechanism driven by the reflected ion and electron drift. Correlations between wave and electron anisotropy variations reveal that the whistlers are affecting electron dynamics and thus their perpendicular and parallel temperatures. The electron signatures are explainable via the interaction of magnetized electrons in the whistler induced nonmonotonic magnetic fields. These waves have intense magnetic fields (delta B/B-circle similar to 0.1-1) and carry sizable currents that are a significant fraction of the thermal current (|J/J(vte)|similar to 0.1-0.5). The whistler-induced currents and the electron anisotropies are sufficiently large to respectively excite high-frequency (HF) electrostatic (>100 Hz) and HF whistler waves (f similar to 0.1-0.5f(ce)). Energy dissipationJ center dot Efrom whistlers at 30 Hz and below range from a few thousandths to few hundredths of mu W/m(3). Comparisons reveal that plasma energy is converted to wave energy in the foot, whereas wave energy gets dissipated into the plasma in the ramp, where irreversible heating occurs. These observed features are indicative of an intricate coupling between small-scale interaction processes and larger-scale structure transpiring within the layer. Such a characterization is only made possible now with the MMS high-time-resolution measurements.

sted, utgiver, år, opplag, sider
American Geophysical Union (AGU) , 2020. Vol. 125, nr 7
Emneord [en]
collisionless shocks, whistler waves, shock currents and electric fields, heating and dissipation, plasma energization, electromagnetic waves
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Identifikatorer
URN: urn:nbn:se:kth:diva-279919DOI: 10.1029/2019JA027290ISI: 000556880400002Scopus ID: 2-s2.0-85088579700OAI: oai:DiVA.org:kth-279919DiVA, id: diva2:1465222
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QC 20200909

Tilgjengelig fra: 2020-09-09 Laget: 2020-09-09 Sist oppdatert: 2022-06-25bibliografisk kontrollert

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Lindqvist, Per-Arne

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