Solar wind proton temperature‐velocity relationship

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Abstract
Data from Helios 1 are examined to find an experimental fit for the T(V) relationship at 1 AU. The data show a distinct change in the proton temperature‐velocity slope at V ∼ 500 km s−1. For V > 500 km s−1, T = (0.77±0.021)V ‐ (265±12.5), while for V < 500 km s−1, T1/2 = (0.031 ± 0.002)V ‐ (4.39±0.08) or T1/3 = (0.0106±0.001)V ‐ (0.278±0.03). These results are compared to the results of Burlaga and Ogilvie (1973) and show excellent agreement in the V < 500 km s−1 range. In addition, the secular variation of T(V) is examined, and it is found that the above functional forms still provide a good fit for a 2‐year interval approaching solar minimum and a 2‐year interval approaching solar maximum.

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