Evidence for the existence of adiabatic energy loss in interplanetary space from observations of the decay of the February 25–March 2, 1969 series of solar cosmic ray events |
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| Authors: | J A Lezniak W R Webber |
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| Institution: | (1) Physics Dept., University of New Hampshire, Space Science Center, 03824 Durham, New Hampshire, UK |
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| Abstract: | The integral flux of low energy protons (> 10 MeV) observed by the University of New Hampshire cosmic ray detector aboard the Pioneer 9 spaceprobe has been compared with similar measurements of the near-Earth spacecraft Explorer 34 during the decay phase of the February 25–March 2, 1969 series of solar cosmic ray events. At this time the Pioneer 9 spaceprobe was 0.8 AU from the Sun and close to the Sun-Earth radial line. The ratio of integral fluxes as measured by the separated spacecraft can be calculated theoretically during the convective phase of the decay of these events and will depend on whether energy loss processes are operative. A comparison of the observed and theoretically calculated ratios suggests that the adiabatic energy loss process is operative. |
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