Strong Perpendicular Velocity-space Diffusion in Proton Beams Observed by Parker Solar Probe
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Verniero, J.L.Chandran, B.D.G.
Larson, D.E.
Paulson, K.
Alterman, B.L.
Badman, S.
Bale, S.D.
Bonnell, J.W.
Bowen, T.A.
De Wit, T.D.
Kasper, J.C.
Klein, K.G.
Lichko, E.
Livi, R.
McManus, M.D.
Rahmati, A.
Verscharen, D.
Walters, J.
Whittlesey, P.L.
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Lunar and Planetary Laboratory, University of ArizonaIssue Date
2022
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American Astronomical SocietyCitation
Verniero, J. L., Chandran, B. D. G., Larson, D. E., Paulson, K., Alterman, B. L., Badman, S., Bale, S. D., Bonnell, J. W., Bowen, T. A., De Wit, T. D., Kasper, J. C., Klein, K. G., Lichko, E., Livi, R., McManus, M. D., Rahmati, A., Verscharen, D., Walters, J., & Whittlesey, P. L. (2022). Strong Perpendicular Velocity-space Diffusion in Proton Beams Observed by Parker Solar Probe. Astrophysical Journal.Journal
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Copyright © 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
The SWEAP instrument suite on Parker Solar Probe (PSP) has detected numerous proton beams associated with coherent, circularly polarized, ion-scale waves observed by PSP's FIELDS instrument suite. Measurements during PSP Encounters 4-8 revealed pronounced complex shapes in the proton velocity distribution functions (VDFs), in which the tip of the beam undergoes strong perpendicular diffusion, resulting in VDF level contours that resemble a "hammerhead."We refer to these proton beams, with their attendant "hammerhead"features, as the ion strahl. We present an example of these observations occurring simultaneously with a 7 hr ion-scale wave storm and show results from a preliminary attempt at quantifying the occurrence of ion-strahl broadening through three-component ion VDF fitting. We also provide a possible explanation of the ion perpendicular scattering based on quasilinear theory and the resonant scattering of beam ions by parallel-propagating, right circularly polarized, fast magnetosonic/whistler waves. © 2022. The Author(s). Published by the American Astronomical Society.Note
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0004-637XVersion
Final published versionae974a485f413a2113503eed53cd6c53
10.3847/1538-4357/ac36d5
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Except where otherwise noted, this item's license is described as Copyright © 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.