Journal article
A two-fluid solar-wind model with intermittent Alfvénic turbulence
Journal of plasma physics, Vol.91(4), E125
08/01/2025
DOI: 10.1017/S0022377825100640
Abstract
In one of the leading theories for the origin of the solar wind, photospheric motions launch Alfvén waves (AWs) that propagate along open magnetic-field lines through the solar atmosphere and into the solar wind. The radial variation in the Alfvén speed causes some of the AWs to reflect, and counter-propagating AWs subsequently interact to produce Alfveńic turbulence, in which AW energy cascades from long wavelengths to short wavelengths and dissipates, heating the plasma. In this paper we develop a one-dimensional two-fluid solar-wind model that includes Alfvénic turbulence, proton temperature anisotropy and a novel method for apportioning the turbulent heating rate between parallel proton heating, perpendicular proton heating and electron heating. We employ a turbulence model that accounts for recent observations from NASA’s Parker Solar Probe, which find that AW fluctuations in the near-Sun solar wind are intermittent and less anisotropic than in previous models of anisotropic magnetohydrodynamic turbulence. Our solar-wind model reproduces a wide range of remote observations of the corona and in-situ measurements of the solar wind, and our turbulent heating model consists of analytic equations that could be usefully incorporated into other solar-wind models and numerical models of more distant astrophysical plasmas.
Details
- Title: Subtitle
- A two-fluid solar-wind model with intermittent Alfvénic turbulence
- Creators
- Benjamin Divakar Giles Chandran - University of New Hampshire at ManchesterToby Adkins - Princeton Plasma Physics LaboratoryStuart D. Bale - University of California SystemVincent David - University of New Hampshire at ManchesterJasper Halekas - University of IowaKristopher Klein - University of ArizonaRomain Meyrand - University of New Hampshire at ManchesterJean C. Perez - Florida Institute of TechnologyMunehito Shoda - The University of TokyoJonathan Squire - University of OtagoEvan Lowell Yerger - University of New Hampshire at Manchester
- Resource Type
- Journal article
- Publication Details
- Journal of plasma physics, Vol.91(4), E125
- DOI
- 10.1017/S0022377825100640
- ISSN
- 0022-3778
- eISSN
- 1469-7807
- Publisher
- Cambridge University Press
- Number of pages
- 35
- Grant note
- National Aeronautics and Space Administration: NNN06AA01C, 80NSSC24K0171, 80NSSC21K1768 U.S. Department of Energy: DE-AC02-09CH11466 Japan Society for the Promotion of Science (M.S., KAKENHI): 24K00688 Royal Society Te Aparangi of New Zealand (J.S., Marsden-Fund grant): MFP-UOO2221
This work was supported by the National Aeronautics and Space Administration (S.B., grant number NNN06AA01C to the Parker Solar Probe FIELDS Experiment; B.C., grant numbers 80NSSC24K0171, 80NSSC21K1768, and NNN06AA01C; V.D., grant number NNN06AA01C; J.H., grant number NNN06AA01C to the Parker Solar Probe SWEAP Experiment; K.K., grant number NNN06AA01C; R.M., grant number 80NSSC24K0171; J.P., grant number 80NSSC21K1768; E.Y., grant number NNN06AA01C); the U.S. Department of Energy (T.A., contract number DE-AC02-09CH11466); the Japan Society for the Promotion of Science (M.S., KAKENHI Grant Number 24K00688); and the Royal Society Te Aparangi of New Zealand (J.S., Marsden-Fund grant MFP-UOO2221).
- Language
- English
- Date published
- 08/01/2025
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984949222802771
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