Engineering topics

Sanderson, T. R.

Publications and source records attributed to Sanderson, T. R..

38 records · Page 3

NASA NTRS1983

ISEE-3 observations of 35-1600 keV protons and low frequency waves upstream of an interplanetary shock

An example of observations of 35-1600-keV protons and low-frequency waves (period about 20 s) associated with the passage of an interplanetary shock at ISEE-3 is presented. For several hours prior to the arrival at the spacecraft of the quasi-parallel shock of April 5, 1979, enhanced fluxes of 35-1600-keV protons and large-amplitude low-frequency waves were observed. During most of this period the spectrum was dominated by particles with energies of about 200 keV. The amplitude of the waves is well correlated with the proton intensity at these energies, suggesting a close relation between the waves and the particles.

Sanderson, T. R.↗

NASA NTRS1982

ISEE-3/IMP-8 observations of simultaneous upstream proton events

Upstream 50-200 keV proton events were observed simultaneously by the low energy proton detectors on ISEE-3 and IMP-8, and the gradient from the spin averaged fluxes at the two spacecraft was calculated. The dependence of that gradient upon the angular distributions at IMP-8 was investigated as well as the distance from IMP-8 to the bow shock. The pitch angle distributions are narrow at ISEE-3 and wide and often pancake-shaped at IMP-8 with a peak near 90 degrees. This implies the existence of a weak scattering region about 5-15 earth radii upstream of the earth's bow shock.

Sanderson, T. R.↗