At a recent meeting of U.S. collaborators for Auger, the consensus opinion was that we should begin the process of securing major U.S. funding for building the northern Auger site. If the Collaboration supports this initiative, a "letter of intent" would be sent to U.S. funding agencies after the upcoming ICRC meeting, advising them to expect a proposal in 2004 for construction of northern Auger. The hope is to get approval in 2005 for construction to begin early in 2006. This is when we expect completion of the southern site. Completing the southern site is the first priority.
Hans Bluemer circulated a summary of the meeting to the auger_collaboration mailing list. John Harton is writing more detailed minutes of what transpired at the meeting February 28 - March 2 at Colorado State University. Electronic slides from some talks are online at http://www.physics.colostate.edu/users/bauleo/Auger/Meetings/03_AugerUS_CSU/Agenda.htm. These include arguments why observing the entire sky is important for identifying the cosmic ray sources.
Below are some "frequently asked questions" whose answers highlight
science issues discussed at the CSU meeting which relate to the need for
A1: Why is it important to study discrete sources with the same sensitivity in all parts of the sky?
A2: Do the AGASA clusters imply that Auger will identify many discrete sources, each with enough showers to study their spectra and compositions separately? What might we learn from magnetic spectroscopy?
A3: Can discrete sources be identified using sub-GZK showers despite greater magnetic bending and a large expected isotropic background?
B1: Do 3-dimensional maps of the nearby universe suggest reasons to expect north-south asymmetry in cosmic ray sources?
B2: Why is near-uniformity of celestial exposure important for sky maps of cosmic ray arrival directions?
B3: What are spherical harmonics and how could they be used in reporting cosmic ray anisotropy? What is the angular power spectrum and what can we learn from it?
B4: Would a non-uniform distribution of cosmic ray sources in our vicinity be detectable in a map of all arrival directions for showers of 10 EeV and above?
C1: How will northern Auger help to measure the energy spectrum and test for the signature of the GZK pion photoproduction?
C2: What can we learn from more accurate measurements of the spectrum?
C3: Will northern Auger improve our understanding of the primary mass distribution?
C4: Might the cosmic ray spectrum or composition be different if measured at a northern site than if measured at the southern site?
D1: Is it important to double our sensitivity to super-GZK events?
D2: Is it important to double our sensitivity to high energy
According to the recent theoretical predictions, how many
and what kind of neutrinos do we expect?