Fig. 3.

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400 km s−1 normalized perpendicular proton temperatures vs. solar radius, as obtained from one-hour-averaged (black curve) and five-hour averaged (yellow curve) raw temperature measurements after multiplication by normalization factors given in Fig. 2. The temperatures were obtained from ∼10 000 h of data collected on four orbits. Comparison of these normalized perpendicular temperatures with the temperature expected in the absence of heating (red curve) shows that the perpendicular protons were heated in situ between 20 and 160 solar radii. The R−4/3 green curve is the temperature expected for no heating of an isotropic plasma.
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