Abstract
Observations bearing on the nature and properties of the interplanetary plasma are reviewed, and consideration is given to possible fruitful directions for further work. The observations are classified according as they involve traditional (comet tail, optical, geomagnetic, cosmic ray), radio (solar noise, radar, radio-source scattering and scintillation, space-probe transmission) or direct (space-probe) measurements. A fairly complete set of references up to September 1967 is given for the cases of comet tail, radar, radio-source scattering and scintillation, and space-probe measurements.
An important development concerns observations of the composition of the solar wind. High-resolution measurements of the positive ion energy per charge spectra have been made using the Vela-3 satellites (Bame et al., 1968). Ionic components other than H+ and He++ have been detected, notably the various ions of oxygen, O+5, O+6, O+7, (Hundhausen et al., 1968). A promising technique for unambiguously distinguishing H+ and He++ ions, based on velocity as well as energy per unit charge, has been flown successfully on the satellite IMP-F by Ogilvie and Williamson (1968).
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This research was supported by the Advanced Research Projects Agency (Project DEFENDER) and was monitored by the U.S. Army Research Office — Durham under Contract DA-31-124-ARO-D-257.
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Axford, W.I. Observations of the interplanetary plasma. Space Sci Rev 8, 331–365 (1968). https://doi.org/10.1007/BF00184740
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DOI: https://doi.org/10.1007/BF00184740