Physics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusmsh13a..06s&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #SH13A-06
Physics
2114 Energetic Particles, Heliospheric (7514), 2134 Interplanetary Magnetic Fields, 2149 Mhd Waves And Turbulence, 2152 Pickup Ions
Scientific paper
We review observations of solar wind heating in the outer heliosphere as measured by the Voyager and Pioneer spacecraft and described previously by a theory of pickup ion wave excitation and turbulent transport. That theory was most recently applied to observations by Smith et al. [2001] and with significant revision of the pickup proton component by Isenberg et al. [2003]. We extend the application of the theory to include time variation of solar wind parameters as recorded by the Omnitape dataset of 1 AU measurements. By averaging Omnitape observations over several solar rotations and using the resulting values as input to the theory, we are able to reproduce the variability of the thermal proton temperatures observed in the outer heliosphere. This is seen to be a direct result of the dependence of energy injection by pickup protons upon bulk solar wind parameters such as Alfven speed and wind speed and the fact that these parameters persist in a predictable manner from 1 AU to the outer heliosphere. Smith et al., JGR, A106, 8253-8272 [2001]
Isenberg et al., ApJ, 592, 564-573 [2003]
Isenberg Philip A.
Matthaeus William H.
Richardson John D.
Smith Walter C.
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