Changes in the low-rigidity primary cosmic radiation during the large Forbush decrease of May 12, 1959

Journal Article · Mon Feb 01 04:00:00 EST 1960 · J. Geophys. Research

DOI:https://doi.org/10.1029/JZ065i002p00767· OSTI ID:4209727

McDonald, F B; Webber, W R

One of the largest and most striking Forbush decreases on record occurred on May 12, 1959. The Deep River, Canada, neutron intensity plotted in Figure 1 for the period from April 10 to June 30 shows clearly this large decrease and subsequent exponential recovery (H. Carmichael, private communication, 1959). Of particular interest are data obtained relating to the rigidity and composition of primary cosmic-ray particles on two balloon flights during this period. The detector used in these experiments consisted of a lucite Cerenkov detector and a NaI scintillation counter. The simultaneous measurement of the Cerenkov counter and the scintillation counter outputs allows a direct determination of the charge and velocity of the incident particles [McDonald and Webber, 1959].

• Research Organization: Univ. of Iowa, Iowa City
• NSA Number: NSA-14-009904
• OSTI ID: 4209727
• Journal Information: J. Geophys. Research, Journal Name: J. Geophys. Research Vol. Vol: 65
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BALLOONS-- COSMIC RADIATION-- DISTRIBUTION-- FORBUSH DEPRESSION-- LEVELS-- MEASURED VALUES-- MOMENTUM-- PRIMARY COSMIC RADIATION-- STRATOSPHERE-- VARIATIONS
COSMIC RADIATION-- DISTRIBUTION-- FORBUSH DEPRESSION-- LEVELS-- MEASURED VALUES-- MOMENTUM-- MONITORING-- NEUTRON DETECTION-- NEUTRONS-- PRIMARY COSMIC RADIATION-- SEA LEVEL-- VARIATIONS
PHYSICS