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On Alfvénic Slow Wind: A Journey From the Earth Back to the Sun
Comparative studies of fast and slow solar wind streams performed over the past decades have illustrated several differences between the plasma regimes for these different flows, examples including features such as temperatures, particle distribution function anisotropies, and the nature of the embedded turbulence, specifically the Alfvénicity of the fluctuations. Though this two state classification of the solar wind primarily based on flow speed has been widely adopted, more in depth studies have found that slow solar win ...
Amicis, R.; Perrone, D.; Bruno, R.; Velli, M.;
Published by: Journal of Geophysical Research (Space Physics) Published on: 04/2021
YEAR: 2021   DOI: 10.1029/2020JA028996
Parker Data Used; Coronal holes; interplanetary magnetic field; MHD waves and turbulence; Solar wind plasma; solar wind sources; turbulence
Dependence of the Interplanetary Magnetic Field on Heliocentric Distance at 0.3\textendash1.7~AU: A Six-Spacecraft Study
We use magnetometer data taken simultaneously by MESSENGER, VEX, STEREO and ACE to characterize the variation of the interplanetary magnetic field (IMF) with heliocentric distance, rh, for rh≲ 1 AU. Power law fits (a rh b) to the individual IMF components and magnitude indicate that, on average, the IMF is more tightly wound and its strength decreases less rapidly with rh than the Parker spiral prediction. During Solar Cycle 24, temporal changes in b were insignificant, but changes in amplitude, a, were correlated with ...
Hanneson, Cedar; Johnson, Catherine; Mittelholz, Anna; Asad, Manar; Goldblatt, Colin;
Published by: Journal of Geophysical Research: Space Physics Published on: 03/2020
YEAR: 2020   DOI: 10.1029/2019JA027139
Heliosphere; IMF; interplanetary magnetic field; Mars; Mercury; parker solar probe; Solar Probe Plus; Venus