ASHRA at the
University of Hawai`i
10-12 March 2005 International ASHRA Collaboration
Meeting in Hilo
23-24 August 2004 2nd International ASHRA Collaboration
Meeting in Kashiwa
7-9 January 2004 International ASHRA Collaboration
Meeting in Hawaii
Neutrino Physics & Astrophysics: ASHRA
ASHRA is a project begun at the University of Tokyo, Institute of Cosmic Ray Research with
the goal of using new and relatively inexpensive imaging technology to observe ultra high
energy cosmic rays via their nitrogen fluoescence in the atmosphere. In this way it is
rather like the older Fly's Eye technique (now pursued in High-Res and Auger projects),
except with far greater angular resolution. The energy region of sensitivity for cosmic
rays in in the neighborhood of 10^18-20 eV. Neutrinos can be detected by observing nearly
horizontal showers which have penetrated more atmosphere than could ordinary cosmic rays
(protons and nuclei). In the head-on mode, ASHRA can detect TeV showers from cosmic rays
and gamma rays, accomplishing separation by the image shape of the shower (as does
Whipple, which pioneered the technique). The initial tests of the detector components
will start on Haleakala in 2004 with a small az-alt mounted unit, which should be capable
of performing useful TeV gamma ray astronomy in and of itself. (See collaboration website
below for more details).
Auger Project homepage, has very nice introductory
material to high energy cosmic rays.
ASHRA Project Members in Hawaii:
UHM: Guillian, Gene,
UHM: Learned, John G.,
UHM: Matsuno, Shigenobu,
UHM: Olsen, Stephen,
UHM: Varner, Gary
HPU (and UHM): Steve Dye, sdye@Hpu.EDU, firstname.lastname@example.org
UH Hilo: Robert Fox, email@example.com
UH Hilo: John Hamilton, firstname.lastname@example.org
Some reference books for background material:
"Introduction to Ultrahigh Energy Cosmic Ray Physics", by Pierre
Sokolsky (U. Utah, Fly's Eye guy). It appears there is a new edition
as of Feb 04, ISBN 0813342120 (about $30). The new edition seems not
to have been reviewed yet (3/04) and I have not seen it, but the old
one was focussed on Fly's Eye and I think was pretty good.
A Scientific American level introduction to cosmic rays, including the
high energy end, is "A Thin Cosmic Rain, particles from outer space"
by Michael Friedlander, Harvard Press 2000 (ISBN 00-039594).
Friedlander is a cosmic ray physicist from Washington Univ. in
St. Louis. Chapter 7 therein covers ultra-high energies, taking one
through the Fly's Eye experiment and mentioning the Auger Project and
OWL. This may make a nice introduction for students as well.
Last modified: 12 Feb 2004
University of Hawaii / email@example.com