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  • Yao, S. T.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. (author)

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

  • Article/chapterEnglish2021

Publisher, publication year, extent ...

  • 2021-12-23
  • American Astronomical Society,2021
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:kth-307055
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-307055URI
  • https://doi.org/10.3847/1538-4357/ac2e97DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • QC 20220110
  • 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.

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Added entries (persons, corporate bodies, meetings, titles ...)

  • Shi, Q. Q.Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China. (author)
  • Zong, Q. G.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China. (author)
  • Degeling, A. W.Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China. (author)
  • Guo, R. L.Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China. (author)
  • Li, L.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China. (author)
  • Li, J. X.Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA USA. (author)
  • Tian, A. M.Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China. (author)
  • Zhang, H.Univ Alaska Fairbanks, Phys Dept, Fairbanks, AK 99775 USA.;Univ Alaska Fairbanks, Geophys Inst, Fairbanks, AK 99775 USA. (author)
  • Yao, Z. H.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China. (author)
  • Fu, H. S.Beihang Univ, Sch Space & Environm, Beijing 100191, Peoples R China. (author)
  • Liu, C. M.Beihang Univ, Sch Space & Environm, Beijing 100191, Peoples R China. (author)
  • Sun, W. J.Univ Michigan, Dept Climate & Space Sci & Engn, Ann Arbor, MI 48109 USA. (author)
  • Niu, Z.Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China. (author)
  • Li, W. Y.Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China. (author)
  • Liu, Z. Y.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China. (author)
  • Le Contel, O.Univ Paris Saclay, Lab Phys Plasmas, Obs Paris, Ecole Polytech,Inst Polytech Paris,CNRS, Paris, France. (author)
  • Zhang, S.Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China. (author)
  • Xiao, C.Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China. (author)
  • Shang, W. S.Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China. (author)
  • Torbert, R. B.Univ New Hampshire, Durham, NH 03824 USA. (author)
  • Ergun, R. E.Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA. (author)
  • Lindqvist, Per-ArneKTH,Rymd- och plasmafysik(Swepub:kth)u1yukyk9 (author)
  • Pollock, C. J.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA. (author)
  • 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)

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  • In:Astrophysical Journal: American Astronomical Society923:20004-637X1538-4357

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