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Observations of the Source Region of Whistler Mode Waves in Magnetosheath Mirror Structures

Kitamura, N. (författare)
Univ Tokyo, Grad Sch Sci, Dept Earth & Planetary Sci, Tokyo, Japan.;Univ Tokyo, Grad Sch Sci, Dept Earth & Planetary Sci, Tokyo, Japan.
Omura, Y. (författare)
Kyoto Univ, Res Inst Sustainable Humanosphere, Uji, Japan.;Kyoto Univ, Res Inst Sustainable Humanosphere, Uji, Japan.
Nakamura, S. (författare)
Kyoto Univ, Res Inst Sustainable Humanosphere, Uji, Japan.;Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi, Japan.;Kyoto Univ, Res Inst Sustainable Humanosphere, Uji, Japan.;Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi, Japan.
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Amano, T. (författare)
Univ Tokyo, Grad Sch Sci, Dept Earth & Planetary Sci, Tokyo, Japan.;Univ Tokyo, Grad Sch Sci, Dept Earth & Planetary Sci, Tokyo, Japan.
Boardsen, S. A. (författare)
NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.;Univ Maryland, Goddard Planetary Heliophys Inst, Baltimore, MD 21201 USA.;NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.;Univ Maryland, Goddard Planetary Heliophys Inst, Baltimore, MD 21201 USA.
Ahmadi, N. (författare)
Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO USA.;Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO USA.
Le Contel, O. (författare)
Univ Paris Saclay, Sorbonne Univ, Ecole Polytech, CNRS,Observ Paris,Lab Phys Plasmas, Paris, France.;Univ Paris Saclay, Sorbonne Univ, Ecole Polytech, CNRS,Observ Paris,Lab Phys Plasmas, Paris, France.
Lindqvist, Per-Arne (författare)
KTH,Rymd- och plasmafysik
Ergun, R. E. (författare)
Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO USA.;Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO USA.
Saito, Y. (författare)
Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan.;Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan.
Yokota, S. (författare)
Osaka Univ, Grad Sch Sci, Dept Earth & Space Sci, Toyonaka, Osaka, Japan.;Osaka Univ, Grad Sch Sci, Dept Earth & Space Sci, Toyonaka, Osaka, Japan.
Gershman, D. J. (författare)
NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.;NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.
Paterson, W. R. (författare)
NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.;NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.
Pollock, C. J. (författare)
Denali Sci, Fairbanks, AK USA.;Denali Sci, Fairbanks, AK USA.
Giles, B. L. (författare)
NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.;NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.
Russell, C. T. (författare)
Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA USA.;Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA USA.
Strangeway, R. J. (författare)
Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA USA.;Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA USA.
Burch, J. L. (författare)
Southwest Res Inst, San Antonio, TX USA.;Southwest Res Inst, San Antonio, TX USA.
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Univ Tokyo, Grad Sch Sci, Dept Earth & Planetary Sci, Tokyo, Japan;Univ Tokyo, Grad Sch Sci, Dept Earth & Planetary Sci, Tokyo, Japan. Kyoto Univ, Res Inst Sustainable Humanosphere, Uji, Japan.;Kyoto Univ, Res Inst Sustainable Humanosphere, Uji, Japan. (creator_code:org_t)
American Geophysical Union (AGU), 2020
2020
Engelska.
Ingår i: Journal of Geophysical Research - Space Physics. - : American Geophysical Union (AGU). - 2169-9380 .- 2169-9402. ; 125:5
Relaterad länk:
https://urn.kb.se/re...
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https://doi.org/10.1...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • In the magnetosheath, intense whistler mode waves, called "Lion roars," are often detected in troughs of magnetic field intensity in mirror mode structures. Using data obtained by the four Magnetospheric Multiscale (MMS) spacecraft, we show that reversals of gradient of magnetic field intensity along the magnetic field correspond to reversals of the field-aligned component of Poynting flux of whistler mode waves in the troughs. Such a characteristic is consistent with the idea that the whistler mode waves are effectively generated near the local minima of magnetic field intensity because of the smallest cyclotron resonance velocity and propagate toward regions of larger magnetic field intensity along the magnetic field lines on both sides. We use the reversal of the Poynting flux as an indicator of wave source regions. In these regions, we find that pancake or an outer edge of butterfly electron distributions above similar to 100 eV are good candidates for wave generation. Unclear correlations of phase difference and amplitude variations of whistler mode waves in cases of similar to 40 km spacecraft separation indicate that a simple plane wave approximation with a constant amplitude is not valid at this spatial scale that is much smaller than the ion gyroradius. The whistler mode waves consist of small coherent wave packets from multiple sources with spatial scales smaller than tens of electron gyroradii transverse to the background magnetic field in a mirror mode structure.

Ämnesord

NATURVETENSKAP  -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)

Nyckelord

whistler mode waves
mirror mode structures
MMS spacecraft
wave generation

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art (ämneskategori)

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