A STUDY OF THE EFFECT AND CONSEQUENCE OF SOLAR-CYCLE VARIATION ON LOW-ENERGY GALACTIC COSMIC-RAYS USING PIONEER-10-H-LYMAN-ALPHA DATA AS A SOLAR-CYCLE PROXY

Citation
K. Scherer et al., A STUDY OF THE EFFECT AND CONSEQUENCE OF SOLAR-CYCLE VARIATION ON LOW-ENERGY GALACTIC COSMIC-RAYS USING PIONEER-10-H-LYMAN-ALPHA DATA AS A SOLAR-CYCLE PROXY, J GEO R-S P, 102(A3), 1997, pp. 4653-4659
Citations number
27
Categorie Soggetti
Geosciences, Interdisciplinary","Astronomy & Astrophysics","Metereology & Atmospheric Sciences
Journal title
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
ISSN journal
21699380 → ACNP
Volume
102
Issue
A3
Year of publication
1997
Pages
4653 - 4659
Database
ISI
SICI code
2169-9380(1997)102:A3<4653:ASOTEA>2.0.ZU;2-W
Abstract
The correlation of the 1981-1990 (similar to 23 to similar to 50 AU) d ata of three instruments, the ultraviolet photometer (UV), the charged particle instrument (CPI), and the trapped radiation detector (TRD), on board Pioneer 10 is investigated. The reduction. of the data necess ary for applying a fast Fourier transform (FFT) algorithm is described . A cross correlation function between the hydrogen Lyman a backscatte red radiation, used as a solar cycle proxy, and the cosmic ray fluxes is obtained from the FFT algorithm. The time lag in the anticorrelatio n function between the galactic cosmic rays and the Lyman alpha line i s used to determine the distance to the solar wind termination shock ( 75 AU), under the assumption that the cosmic ray modulation boundary f or low-energy particles and the termination shock are coincident. The ratio of the upwind termination shock distance to the downwind shock d istance is determined to be 2/3 using the Voyager 1 position in 1996.