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Short wavelength ion-cyclotron waves upstream of the earth's bow shock
Institution:1. Department of Haematological Medicine, King’s College Hospital, King’s College London, and National Institute for Health and Care Research / Wellcome King’s Clinical Research Facility, London, United Kingdom;2. Hematology Division, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States;3. Department of Haematology, Leeds Teaching Hospitals NHS Trust, Leeds, United Kingdom;4. Jane Anne Nohl Division of Hematology, University of Southern California Keck School of Medicine, Los Angeles, CA, United States;5. Department of Hematology and Stem Cell Transplantation, West German Cancer Center, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
Abstract:Ion beams reflected from the bow shock are shown to excite ioncyclotron instability in the solar wind. For the parameters relevant to the solarwind upstream of the terrestrial bow shock the growth
></figure> is found to be a significant fraction of the ion cyclotron frequency <em>μ</em><sub><em>i</em></sub> for K <figure class=></figure><sub>M</sub> ≳ 2. Here K is the wave vector and <figure class=></figure><sub>M</sub> is the proton gyro radius. The corresponding wave frequency <em>ω</em><sub><em>r</em></sub> is found to be from ∼ 0.5 to several times the ion gyrofrequency <em>μ</em><sub><em>i</em></sub>. Since the group velocities of these waves are small they can efficiently interact with the plasma in and near the generating region.</td>
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