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Krimigis, S. M.

Publications and source records attributed to Krimigis, S. M..

At least 199 records · Page 11
All sourcesNASA NTRSDOE OSTI
NASA NTRS1973

The charge composition aspect of energetic trapped particles

Three possible sources of particle species important to the energy balance of the magnetosphere are discussed, with special emphasis on particles with different charge-to-mass ratios. Possibilities for various experimental tests are pointed out. Some recent experimental data on geomagnetically trapped alpha particles are compared with relevant results of current theoretical work. An experiment is proposed that is likely to provide quantitative indications for the energization and loss processes affecting ionic particle species in the magnetosphere.

Krimigis, S. M.↗
NASA NTRS1972

Changes in the distribution of low-energy trapped protons associated with the April 17, 1965, magnetic storm.

The absolute intensity of geomagnetically trapped protons in the energy ranges from 0.52 to 4.0 MeV and from 0.90 to 1.8 MeV has been measured with the solid-state proton detector on the satellite Injun 4 for the period from Mar. 1 to May 31, 1965. A study of the temporal variations of these fluxes associated with the Apr. 17, 1965, magnetic storm shows a general redistribution of these protons for L greater than 2.5. The effect of the sudden commencement was a general depression in the intensities and a hardening of the energy spectra, although the intensities recovered to their prestorm level during the initial phase. The major redistribution was apparently initiated by the polar substorm. During the recovery phase, a secondary peak developed in the intensity profile at L of about 3.5 for 0.52-MeV protons that had no counterpart at this energy at the equator. No such peak was observed for 0.9-MeV protons.

Burns, A. L.↗
NASA NTRS1971

Observations of low-energy /0.3- to 1.8-MeV/ differential spectrums of trapped protons.

Measurements of differential energy spectrums of trapped protons obtained from several passes during the period January to November 1969 using the polar orbiting, low-altitude Injun 5 satellite equipped with a special solid-state detector proton-electron telescope are presented. Results reveal the existence of a quasi-persistent peak in the differential energy spectrum in the McIlwain shell parameter (L) range 2 to 2.6 and in the energy range of approximately 0.32 to 0.72 MeV. The fact that the shape of the spectrum is stable for several days or can change with time scales as small as 4 hours suggests an impulsive acceleration mechanism deep in the radiation belts. Other features of the spectrum show that if the spectrum is represented by an exponential form in energy, the dependence of the spectral parameter is in general agreement with diffusion theory over the L range of approximately 2 to 4.

Venkatesan, D.↗
NASA NTRS1971

Low-energy cosmic rays near earth

Interplanetary space low energy cosmic ray protons steady state anisotropy based on radial gradient model of outward convection at solar wind speeds

Axford, W. I.↗
NASA NTRS1970

X-ray emissions from the sun

Solar X ray emissions from quiet and active sun compared with radio flux to investigate production mechanisms

Krimigis, S. M.↗