Search for Solar Neutrons Using the MESSENGER Neutron Spectrometer Between 0.7 and 0.32 AU

Details Search for Solar Neutrons Using the MESSENGER Neutron Spectrometer Between 0.7 and 0.32 AU Search for Solar Neutrons Using the MESSENGER Neutron Spectrometer Between 0.7 and 0.32 AU

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh22a0837f&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH22A-0837

Physics

7509 Corona, 7514 Energetic Particles (2114), 7519 Flares, 7554 X-Rays, Gamma Rays, And Neutrinos

Scientific paper

The MESSENGER Neutron Spectrometer is composed of three separate sensors that span the neutron energy range between 0 and about 8 MeV. It has been operating continuously since about 1 February 2007. After the spacecraft's second Venus flyby on 5 June 2007, this detector will be sensitive to solar neutrons in the heliospheric distance range between 0.32 AU and 0.7 AU. The time period between the Venus flyby and orbit insertion in March 2011 spans the solar activity cycle between solar minimum and solar maximum. The first perihelion of MESSENGER's new orbit occurred on 1 September 2007. Counting rates of neutrons in the thermal and epithermal energy range (up to about 0.5 MeV) are sensibly zero. Observed rates for neutron energies between about 0.5 MeV and 8 MeV, signifying cosmic-ray interactions with spacecraft material, average about 1.9/s. As of the time of writing of this abstract, no solar flares have occurred and it is too early to place either actual rates for, or lower limits on, detection of background solar neutrons that result from the quiet-time heating of the corona. These rates will be reported at the meeting.

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