University of Maryland
Atlantic Building, Room 2400
4:30 PM Monday, December 10, 2012
Coffee, Tea & Snacks 4:15-4:30 PM

Matthew E. Hill
Johns Hopkins University Applied Physics Laboratory
The Voyager 1 Transition to Interstellar Space

Once again we have dramatic measurements from the Voyager 1 spacecraft that we do not understand. Beginning in May 2012 Voyager 1 began a transition into a region unlike any previously encountered in space. I will summarize the latest observations, which include the disappearance of heliosheath ions and most of the anomalous cosmic rays, abrupt increases in the galactic cosmic ray (GCR) ion intensity and anisotropy, increase in GCR electrons intensities coinciding with a complete loss of electrons from inside the heliosphere, and striking magnetic field strength increases. I will place these observations in context of earlier heliosheath observations from Voyager 1 and 2 and discuss some potential explanations.

Sponsored by: Department of Physics and the Institute for Physical Science and Technology, University of Maryland. For information call Catha Stewart 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.