Increase of the nucleonic intensity on May 4, 1960

Journal Article · Thu Sep 01 04:00:00 EDT 1960 · Journal of Geophysical Research

DOI:https://doi.org/10.1029/JZ065i009p03011· OSTI ID:4122844

Trainor, J. H.; Shea, M. A.; Lockwood, J. A.

An increase in cosmic-ray intensity at the earth was observed on May 4, 1960, approximately 16 min after a class 2 solar flare. The increase was very rapid and was recorded only at certain stations within well-defined regions. The observations reported were made at Mt. Washington (elevation 1909 m) and Durham, N.H. (sea level). Some tentative conclusions are given concerning the rigidity spectra of the flare produced particles. The cosmic-ray intensity increase started at 1031.5 plus or minus 1.0 UT and reached a maximum increase of 214% between 1040 and 1042, falling to 18% at 1125 to 1130. At 1830 to 1930, the intensity was still approximately 2.4% above the pre-increase level. The nucleoric intensity increase was about 20% below that in 1954. A plot of the 12- hr average neutron intensity as percentage change from the average of Apr. 25 to May 4, 1960, shows that the intensity was recovering from a series of Forbush events. None of these events appeared to be associated with the region which produced the cosmic-ray increase. (B.O.G.)

• Research Organization: Univ. of New Hampshire, Durham
• Sponsoring Organization: USDOE
• NSA Number: NSA-15-000814
• OSTI ID: 4122844
• Journal Information: Journal of Geophysical Research, Journal Name: Journal of Geophysical Research Journal Issue: 9 Vol. 65; ISSN 0148-0227
• Publisher: American Geophysical Union
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

COSMIC RADIATION
EARTH
MASSACHUSETTS
NEUTRONS
PHYSICS