357 research outputs found
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The GLAST Background Model
In order to estimate the ability of the GLAST/LAT to reject unwanted background of charged particles, optimize the on-board processing, size the required telemetry and optimize the GLAST orbit, we developed a detailed model of the background particles that would affect the LAT. In addition to the well-known components of the cosmic radiation, we included splash and reentrant components of protons, electrons (e+ and e-) from 10 MeV and beyond as well as the albedo gamma rays produced by cosmic ray interactions with the atmosphere. We made estimates of the irreducible background components produced by positrons and hadrons interacting in the multilayered micrometeorite shield and spacecraft surrounding the LAT and note that because the orbital debris has increased, the shielding required and hence the background are larger than were present in EGRET. Improvements to the model are currently being made to include the east-west effect
The Forgotten Equality Norm in Immigration Preemption: Discrimination, Harassment, and the Civil Rights Act of 1870
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Bright AGN Source List from the First Three Months of the Fermi Large Area Telescope All-Sky Survey
Course of study in arithmetic, fourth grade.
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Seattle, Washington 1949
Indicates major and secondary arterial streets, access streets, state primary and secondary streets
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