ON THE PERIODIC VARIATIONS OF SECONDARY COSMIC-RAYS AND THE GEOMAGNETIC PC4 PULSATIONS IN BMAR

Authors
MARTIN IM GUSEV AA KUDELA K KASSOVICOVA J PUGACHEVA GI
Citation
Im. Martin et al., ON THE PERIODIC VARIATIONS OF SECONDARY COSMIC-RAYS AND THE GEOMAGNETIC PC4 PULSATIONS IN BMAR, Annales geophysicae, 15(8), 1997, pp. 1009-1014
Citations number
20
Categorie Soggetti
Astronomy & Astrophysics","Geosciences, Interdisciplinary","Metereology & Atmospheric Sciences
Journal title
Annales geophysicae → ACNP
ISSN journal
09927689
Volume
15
Issue
8
Year of publication
1997
Pages
1009 - 1014
Database
ISI
SICI code
0992-7689(1997)15:8<1009:OTPVOS>2.0.ZU;2-B
Abstract
In a set of balloon flights in the Brazilian magnetic anomaly region ( BMAr) short time periodic variations were observed, i.e. pulsation, of secondary charged and neutral particle fluxes, X-and gamma-ray fluxes with amplitudes of about 2-4%. The pulsations are accompanied by the geomagnetic Pc4 pulsations and have similar periodicity. The phenomeno n was observed over various local times and in quiet and disturbed mag netospheric conditions. One of the explanations of this effect, i.e. p eriodic variation of local cut-off rigidity, and following pulsations of primary and secondary cosmic ray intensity is suggested.