Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 777, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/777/1/L3
Keywords
instabilities; solar wind; turbulence; waves
Categories
Funding
- NASA [NNX11AJ37G, NNS12AB27G]
- NASA [143887, NNX11AJ37G] Funding Source: Federal RePORTER
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Previous studies have shown that the observed temperature anisotropies of protons and alpha particles in the solar wind are constrained by theoretical thresholds for pressure and anisotropy driven instabilities such as the Alfven/ion-cyclotron (A/IC) and fast-magnetosonic/whistler (FM/W) instabilities. In this Letter, we use a long period of in situ measurements provided by the Wind spacecraft's Faraday cups to investigate the combined constraint on the alpha proton differential flow velocity and the alpha particle temperature anisotropy due to A/IC and FM/W instabilities. We show that the majority of the data are constrained to lie within the region of parameter space in which A/IC and FM/W waves are either stable or have extremely low growth rates. In the minority of observed cases in which the growth rate of the A/IC (FM/W) instability is comparatively large, we find relatively higher values of T-perpendicular to alpha/T-perpendicular to p (T-parallel to a/T-parallel to p) when the alpha proton differential flow velocity is small, where T-perpendicular to alpha and T-perpendicular to p (T parallel to(alpha) and T parallel to(p)) are the perpendicular (parallel) temperatures of alpha particles and protons. We conjecture that this observed feature might arise from preferential alpha particle heating which can drive the alpha particles beyond the instability thresholds.
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