PROPAGATION OF SOLAR COSMIC RAYS THROUGH INTERPLANETARY MAGNETIC FIELD
In recert years evidence has accumulated that lowenergy solar cosmic-ray particles arrive at the earth sfter intense solar disturbances. The time-delay of polarcap absorptions and of geomagnetic storms, which follow after an intense solar radio outburst of type IV, indicates that solar cosmic-ray particles originating to the west of the solar central meridian reach the earth earlier an more easily than those from the east. The model of the interplanetary magnetic field, which may be appropriate for the explanation of this evidence, is as follows: The interplanetary magnetic field is formed by the outwardstreaming solar winds which carry the imbedded solar magnetic fields and the lines of force lirked with the sun. The rotation of the sun produces a curvatare of streams and consequently of the lines of force, which are convex toward the west. Since the injected solar particles tend to travel along the existing magnetic lines of force, this model explains the western excess of the arrival of solar cosmic rays as well as the inequality of their travel time with respect to the heliographic position. The estimated intensity of the magnetic field is of the order of 10/ sup -3/ to 10/sup -5/ gauss near the earth's orbit. (auth)
- Research Organization:
- Hiraiso Radio Observatory, Radio Research Labs., Nakaminato-shi, Ibaragi-ken, Japan
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-15-002035
- OSTI ID:
- 4130467
- Journal Information:
- J. Geophys. Research, Journal Name: J. Geophys. Research Vol. Vol: 65
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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