Cosmic Ray Variational Coefficients - The Effect of Altitude Variations and Secular Variations,
Abstract
The extended sets of variational coefficients have been examined to ascertain the effects of altitude and also for possible differences arising from secular changes in the earth's magnetic field. An examination of the variational coefficients calculated for two closely positioned cosmic ray stations in Europe indicates that the altitude effects are small. A comparison of the variational coefficients calculated for three epochs of the geomagnetic field for Western Hemispheric locations where the geomagnetic field has its most rapid secular change indicates that the secular variation in the vertical cutoff rigidity (and associated changes in the asymptotic direction calculations) are such that the variational coefficients calculated using either a 1955 or a 1975 model of the geomagnetic field are adequate for most cosmic ray analyses. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1977
- Accession Number
- ADA043896
Entities
People
- D. F. Smart
- M. A. Shea
- O. H. Binder
Organizations
- Air Force Research Laboratory