Solar corpuscular radiation and polar ionospheric disturbances
Study of disturbances in the polar ionosphere yields considerable evidence of the existence of energetic solar particles associated with solar flares. Radio blackouts due to enhanced ionizations are classified into two characteristic types: the polar-cap blackout, and the auroral-zone blackout. It is shown that the polar-cap blackout appears with some hours' delay after a major solar radio out-b type IV, and is confined within the geomagnetic latitude of abcut 60 to 65 deg . The estimated energies of particles causing it are of about 10 to 100 Mev. The auroral-zone blackout follows, accompanied by geomagnetic storms and auroras; it may be caused by the so-caIled auroral particles of 1 Mev or less. The energy spectrum of solar qparticles associated with solar flares is discussed in view of these results and of information from various observations of solar and terrestrial disturbances. It is concluded that solar particles have a conspicuous suprathermal nonMaxwellian tail extending from a few kev to relativistic energy ranges, though the main part of corpuscular clouds consists of particles of rather low energy, which are likely to be in the Maxwellian distribution. The nature of solar corpuscular clouds and their effect upon the terrestrial ionosphere are discussed. (auth)
- Research Organization:
- Hiraiso Radio Observatory, Radio Research Labs., Nakaminato-shi, Ibaragi-ken, Japan
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-15-002034
- OSTI ID:
- 4155553
- Journal Information:
- Journal of Geophysical Research, Journal Name: Journal of Geophysical Research Journal Issue: 10 Vol. 65; ISSN 0148-0227
- Publisher:
- American Geophysical Union
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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