Measurement of the isotopic composition of cosmic-rays at 3 GeV/n using a new geomagnetic method

Details Measurement of the isotopic composition of cosmic-rays at 3 GeV/n using a new geomagnetic method Measurement of the isotopic composition of cosmic-rays at 3 GeV/n using a new geomagnetic method

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...193...69f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 193, no. 1-2, March 1988, p. 69-80.

Astronomy and Astrophysics

Astronomy

6

Cosmic Rays, Galactic Radiation, Isotopes, Spaceborne Astronomy, Abundance, Geomagnetism, Heao 3, Magnesium Isotopes, Neon Isotopes, Silicon Isotopes

Scientific paper

The French-Danish C2 instrument on board the HEAO 3 satellite has been used to measure the mean masses of N, Ne, Mg, Al, Si, S, Ca, Mn, and Fe in the Galactic cosmic rays, at an average kinetic energy of 3.0 GeV/n. The technique takes advantage of the effect of the geomagnetic field upon the cosmic rays fluxes. A new method is described, in which the geomagnetic field effect is quantitatively computed. Using a simple exponential path length propagation model, the inferred isotopic source ratios Ne-22/Ne-20 and (Mg-25 + Mg-26)/Mg-24 are found significantly greater than the present solar system ratios by factors 2.93 (+0.84, -0.77) and 1.85 (+0.47, -0.35). The (Si-29 + Si-30)/Si-28 source ratio is found to marginally exceed the local Galactic ratio by a factor 1.83 (+0.94, -0.74). The elemental N-14/O source ratio, derived from the estimated N-15 fraction at earth, is 6.7 (+2.2, -2.3) percent, in agreement with the value derived independently from the elemental N/O measurement. These results are compared with low energy measurements, and their implications regarding the sources of cosmic rays are discussed.

Affiliated with

Also associated with

No associations

Rating

Measurement of the isotopic composition of cosmic-rays at 3 GeV/n using a new geomagnetic method does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Measurement of the isotopic composition of cosmic-rays at 3 GeV/n using a new geomagnetic method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Measurement of the isotopic composition of cosmic-rays at 3 GeV/n using a new geomagnetic method will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1669950