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Propagation of Ultr...
Propagation of Ultralow-Frequency Waves from the Ion Foreshock into the Magnetosphere During the Passage of a Magnetic Cloud
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- Takahashi, Kazue (författare)
- Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA.
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- Turc, Lucile (författare)
- Univ Helsinki, Dept Phys, Helsinki, Finland.
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- Kilpua, Emilia (författare)
- Univ Helsinki, Dept Phys, Helsinki, Finland.
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- Takahashi, Naoko (författare)
- Univ Tokyo, Grad Sch Sci, Dept Earth & Planetary Sci, Tokyo, Japan.
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- Dimmock, Andrew P. (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Kajdic, Primoz (författare)
- Univ Nacl Autonoma Mexico, Inst Geofis, Ciudad Univ, Ciudad De Mexico, Mexico.
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- Palmroth, Minna (författare)
- Univ Helsinki, Dept Phys, Helsinki, Finland.;Finnish Meteorol Inst, Helsinki, Finland.
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- Pfau-Kempf, Yann (författare)
- Univ Helsinki, Dept Phys, Helsinki, Finland.
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- Soucek, Jan (författare)
- Acad Sci Czech Republ, Inst Atmospher Phys, Prague, Czech Republic.
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- Motoba, Tetsuo (författare)
- Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA.
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- Hartinger, Michael D. (författare)
- Space Sci Inst, Boulder, CO USA.;Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA.
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- Artemyev, Anton (författare)
- Univ Calif Los Angeles, Los Angeles, CA USA.
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- Singer, Howard (författare)
- NOAA, Space Weather Predict Ctr, Boulder, CO USA.
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- Ganse, Urs (författare)
- Univ Helsinki, Dept Phys, Helsinki, Finland.
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- Battarbee, Markus (författare)
- Univ Helsinki, Dept Phys, Helsinki, Finland.
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Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA Univ Helsinki, Dept Phys, Helsinki, Finland. (creator_code:org_t)
- American Geophysical Union (AGU), 2021
- 2021
- Engelska.
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Ingår i: Journal of Geophysical Research - Space Physics. - : American Geophysical Union (AGU). - 2169-9380 .- 2169-9402. ; 126:2
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We have examined the properties of ultralow-frequency (ULF) waves in space (the ion foreshock, magnetosheath, and magnetosphere) and at dayside magnetometer stations (L = 1.6-6.5) during Earth's encounter with a magnetic cloud in the solar wind, which is characterized by magnetic fields with large magnitudes (similar to 14 nT) and small cone angles (similar to 30 degrees). In the foreshock, waves were excited at similar to 90 m Hz as expected from theory, but there were oscillations at other frequencies as well. Oscillations near 90 mHz were detected at the other locations in space, but they were not in general the most dominant oscillations. On the ground, pulsations in the approximate Pc2-Pc4 band (5 mHz-120 mHz) were continuously detected at all stations, with no outstanding spectral peaks near 90 mHz in the H component except at stations where the frequency of the third harmonic of standing Alfven waves had this frequency. The fundamental toroidal wave frequency was below 90 mHz at all stations. In the D component spectra, a minor spectral peak is found near 90 mHz at stations located at L < 3, and the power dropped abruptly above this frequency. Magnetospheric compressional wave power was much weaker on the nightside. A hybrid-Vlasov simulation indicates that foreshock ULF waves have short spatial scale lengths and waves transmitted into the magnetosphere are strongly attenuated away from noon.
Ämnesord
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)
Nyckelord
- ion foreshock
- global propagation
- hybrid‐
- Vlasov simulation multipoint observation
- ULF waves
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Takahashi, Kazue
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Turc, Lucile
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Kilpua, Emilia
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Takahashi, Naoko
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Dimmock, Andrew ...
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Kajdic, Primoz
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visa fler...
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Palmroth, Minna
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Pfau-Kempf, Yann
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Soucek, Jan
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Motoba, Tetsuo
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Hartinger, Micha ...
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Artemyev, Anton
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Singer, Howard
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Ganse, Urs
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Battarbee, Marku ...
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visa färre...
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