Prediction of solar particle events and geomagnetic activity using interplanetary scintillation observations from the iowa cocoa-cross radio telescope. Final report April 1, 1976--March 31, 1978

Technical Report · Mon May 01 00:00:00 EDT 1978

OSTI ID:6404010

Roelof, E C; Gotwols, B L; Mitchell, D G; Cronyn, W M; Shawhan, S D

Synoptic interplanetary scintillation (IPS) observations were taken during the summer of 1976 and autumn of 1977 on the University of Iowa COCOA-Cross radio telescope (34.3 MHz), with supplementary observations from the University of Maryland TPT array (38 MHz). A new high sampling rate (10 times per second) digital system made it possible to reconstruct the IPS power spectrum between 0.1-3.0 Hz. The observations, combined with earlier (1974) measurements of integrated IPS power (scintillation index), have led to the conclusion (based on theoretical modelling) that prediction of activity and associated variations in energetic solar particle events is feasible with a lead time of about 24 hours. The technique depends on the observed broadening of the IPS power spectrum as solar wind density enhancements approach the earth. This effect has been documented for both co-rotating and solar flare-associated plasma disturbances.

• Research Organization: Johns Hopkins Univ., Silver Spring, MD (USA). Applied Physics Lab.
• OSTI ID: 6404010
• Report Number(s): AD-A-056895
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
GEOMAGNETIC FIELD
DENSITY
SOLAR PARTICLES
DISTURBANCES
FORECASTING
INTERPLANETARY SPACE
MHZ RANGE 01-100
SOLAR FLARES
SOLAR WIND
VARIATIONS
FREQUENCY RANGE
MAGNETIC FIELDS
MHZ RANGE
PHYSICAL PROPERTIES
RADIATIONS
SOLAR ACTIVITY
SOLAR RADIATION
SPACE
STELLAR RADIATION
640104* - Astrophysics & Cosmology- Solar Phenomena
640203 - Atmospheric Physics- Magnetospheric Phenomena- (-1987)