Displaced isorigidity contours in the North Atlantic for 1975

Details Displaced isorigidity contours in the North Atlantic for 1975 Displaced isorigidity contours in the North Atlantic for 1975

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86..219k&link_type=abstract

Journal of Geophysical Research, vol. 86, Jan. 1, 1981, p. 219-223. Research supported by the South African Council for Scienti

Astronomy and Astrophysics

Astronomy

3

Astrometry, Cosmic Rays, Latitude Measurement, Radiation Measurement, Ray Tracing, Atlantic Ocean, Cut-Off, Flight Paths, Neutron Counters, Rigidity, Secular Variations, Trajectory Analysis

Scientific paper

Results of cosmic ray measurements in the Northern and Southern Hemispheres are discussed in relation to detailed cutoff rigidity calculations. Counting rates were obtained from a neutron-moderated detector flown aboard a commercial airline flight from Johannesburg to New York, and plotted as a function of vertical cutoff rigidity as interpolated from the 5 x 15 deg world grid for 1975. A mismatch between the counting rates in the two hemispheres is observed which could be corrected by the increase of cutoff rigidities in the North Atlantic by approximately 0.5 GV. Detailed vertical cutoff rigidity calculations by the trajectory-tracing method along the flight path and for a 1 x 1 deg grid in the area between 20 and 36 deg N and 308 and 325 deg E are presented which are also found not to eliminate the mismatch in count rates. Results indicate that a 5 x 15 deg grid of calculated cutoff rigidities is not sensitive enough for the North Atlantic.

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