University of Maryland
Atlantic Building, Room 2400
4:30 PM Monday, April 23, 2012
Coffee, Tea & Snacks 4:15-4:30 PM

Kenneth McCracken
Jellore, Australia
Periodic variations of the cosmic radiation over the past 9,400 years, and their correlation with solar system phenomena

This is an update on work presented here in 2011. It will describe how our understanding of cosmic ray phenomena is being used as an investigative tool to study solar system physics over the past 9,400 years. Using three 9,400 year long paleo-cosmic ray records (PCR)- two 10Be; one 14C- it has been shown that the same 16 stable, well defined periodicities in the range 60- 2310 years are present in each of these three completely independent records. They are not of terrestrial origin, and our understanding of cosmic rays physics obtained with ground and space based instrumentation indicates that they represent periodicities in the cosmic radiation incident on earth in the past. Unlike the unstable 11-year solar activity cycle, some of the periodicities exhibit strong frequency control. Contrary to theoretical guidance, it is found that there are three major correlations between at least twelve of the periodicities in the PCR, and the orbital properties of the Jovian planets, with a probability of occurring by chance < 4x10-8. Examination of the instrumental cosmic ray record since 1951, and the sunspot record since 1750 shows that three anomalous solar cycles, and the long sunspot minimum of 2007-9 were closely correlated with a particular dynamic configuration of the Jovian planets. Such correlations in both the frequency and time domains have been dismissed in the past by the main-stream solar community on the grounds of limited statistics, and because they were inexplicable in terms of gravitational, tidal, and other conventional mechanisms. The speaker and his Swiss colleagues propose that the extremely strong correlations obtained from both the PCR and the modern data makes it appropriate to reconsider this question again. What, precisely, have we missed?

Sponsored by: Department of Physics and the Institute for Physical Science and Technology, University of Maryland. For information call Victoria at (301) 405-4811 or go to the UMD Space Physics group seminar web site.

There is free parking after 4:00 PM in lot B (the big parking garage across the street from the ATL building). There are a limited number of spaces in lot Q next to the new ATL wing with free parking after 4PM even when there is a basketball game on campus.