Satellite OV 5-6 measured solar proton event alpha/proton flux ratios and associated atmospheric effects. Final scientific report

Technical Report · Thu Jan 01 04:00:00 EST 1976

OSTI ID:7333793

Sellers, B; Hanser, F A

The time dependence of satellite OV5-6 measured proton and alpha fluxes has been determined for a series of events in the 1969--73 descent period of solar cycle 20. These fluxes have been used to investigate the variation of the alpha/proton flux ratio both within a given event and from event-to-event. An approximate relationship between riometer absorption, and the square root of proton flux (above a threshold energy of 2.2 MeV) for nighttime PCA conditions is presented which is similar to that previously used for day conditions. By use of a new formulation the proton fluxes are used to make an accurate calculation of the absorption and this is compared with both the approximate and measured values. Also discussed are possible uses of alpha/proton measurements made soon after event onset for later time predictions, in particular the time evolution of absorption. (auth)

• Research Organization: Panametrics, Inc., Waltham, Mass. (USA)
• OSTI ID: 7333793
• Report Number(s): AD-A-021909
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
640201 -- Atmospheric Physics-- Auroral
Ionospheric
& Magetospheric Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION
ALPHA PARTICLES
BARYONS
CHARGED PARTICLES
EARTH ATMOSPHERE
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FLUX DENSITY
HADRONS
IONOSPHERE
MEV RANGE
NUCLEONS
POLAR-CAP ABSORPTION
PROTONS
RADIATIONS
SOLAR ALPHA PARTICLES
SOLAR PARTICLES
SOLAR PROTONS
SOLAR RADIATION
STELLAR RADIATION
TIME DEPENDENCE
VARIATIONS
WAVE PROPAGATION