Accession Number : AD0678101

Title :   THE ELECTRIC FIELD IN THE SOLAR CORONAL EXOSPHERE AND THE SOLAR WIND.

Descriptive Note : Environmental research papers no 292,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : Sen,Hari K.

Report Date : OCT 1968

Pagination or Media Count : 17

Abstract : The solar coronal exosphere (fixed at a level where the mean free path is comparable with the scale height) is shown to act like the sheath in a laboratory discharge, that builds up an excess positive charge and electric field. Equality of flux for the charged particles (protons and electrons) at the exosphere is assumed. The value of exospheric electric potential makes the protons virtually weightless. The exospheric sheath potential accelerates the thermal protons to a velocity of 258 km/sec, with which they coast to the earth. The proton density in transit varies approximately as the inverse square law. Higher velocities and densities are obtained for higher coronal temperatures. An estimate of the exospheric transition region is obtained by applying the hydrodynamic theory of ambipolar diffusion in a gravitational field to the observed coronal density distribution. (Author)

Descriptors :   (*SOLAR ATMOSPHERE, *ELECTRIC FIELDS), EXOSPHERE, SOLAR CORONA, SOLAR WIND, CHARGED PARTICLES, DENSITY, VELOCITY, GRAVITY, DIFFUSION, EQUATIONS OF MOTION, MATHEMATICAL MODELS

Subject Categories : Astrophysics
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE