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Sökning: (WFRF:(Lindqvist A)) pers:(Pollock C. J.) > (2021) > Low-frequency Whist...

Low-frequency Whistler Waves Modulate Electrons and Generate Higher-frequency Whistler Waves in the Solar Wind

Yao, S. T. (författare)
Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China.;Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China.
Shi, Q. Q. (författare)
Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China.
Zong, Q. G. (författare)
Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China.
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Degeling, A. W. (författare)
Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China.
Guo, R. L. (författare)
Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China.
Li, L. (författare)
Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China.
Li, J. X. (författare)
Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA USA.
Tian, A. M. (författare)
Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China.
Zhang, H. (författare)
Univ Alaska Fairbanks, Phys Dept, Fairbanks, AK 99775 USA.;Univ Alaska Fairbanks, Geophys Inst, Fairbanks, AK 99775 USA.
Yao, Z. H. (författare)
Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China.
Fu, H. S. (författare)
Beihang Univ, Sch Space & Environm, Beijing 100191, Peoples R China.
Liu, C. M. (författare)
Beihang Univ, Sch Space & Environm, Beijing 100191, Peoples R China.
Sun, W. J. (författare)
Univ Michigan, Dept Climate & Space Sci & Engn, Ann Arbor, MI 48109 USA.
Niu, Z. (författare)
Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China.
Li, W. Y. (författare)
Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China.
Liu, Z. Y. (författare)
Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China.
Le Contel, O. (författare)
Univ Paris Saclay, Lab Phys Plasmas, Obs Paris, Ecole Polytech,Inst Polytech Paris,CNRS, Paris, France.
Zhang, S. (författare)
Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China.
Xiao, C. (författare)
Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China.
Shang, W. S. (författare)
Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China.
Torbert, R. B. (författare)
Univ New Hampshire, Durham, NH 03824 USA.
Ergun, R. E. (författare)
Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA.
Lindqvist, Per-Arne (författare)
KTH,Rymd- och plasmafysik
Pollock, C. J. (författare)
NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.
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Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China;Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China. Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China. (creator_code:org_t)
2021-12-23
2021
Engelska.
Ingår i: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 923:2
Relaterad länk:
https://doi.org/10.3...
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https://urn.kb.se/re...
https://doi.org/10.3...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • The role of whistler-mode waves in the solar wind and the relationship between their electromagnetic fields and charged particles is a fundamental question in space physics. Using high-temporal-resolution electromagnetic field and plasma data from the Magnetospheric MultiScale spacecraft, we report observations of low-frequency whistler waves and associated electromagnetic fields and particle behavior in the Earth's foreshock. The frequency of these whistler waves is close to half the lower-hybrid frequency (similar to 2 Hz), with their wavelength close to the ion gyroradius. The electron bulk flows are strongly modulated by these waves, with a modulation amplitude comparable to the solar wind velocity. At such a spatial scale, the electron flows are forcibly separated from the ion flows by the waves, resulting in strong electric currents and anisotropic ion distributions. Furthermore, we find that the low-frequency whistler wave propagates obliquely to the background magnetic field ( B (0)), and results in spatially periodic magnetic gradients in the direction parallel to B (0). Under such conditions, large pitch-angle electrons are trapped in wave magnetic valleys by the magnetic mirror force, and may provide free perpendicular electron energy to excite higher-frequency whistler waves. This study offers important clues and new insights into wave-particle interactions, wave generation, and microscale energy conversion processes in the solar wind.

Ämnesord

NATURVETENSKAP  -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

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