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Proceedings Paper

The FORTE VHF instrument as a high-energy cosmic ray detector
Author(s): Nikolai G. Lehtinen; Peter W. Gorham; Abram R. Jacobson; Robert A. Roussel-Dupre
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Paper Abstract

The FORTE satellite records bursts of electromagnetic waves arising from near the Earth's surface in the radio frequency (RF) range of 30 to 300 MHz with a polarization-selective antenna. We investigate possible RF signatures of ultra-high energy cosmic rays (UHECR), including Cherenkov radiation in ice, UHECR-triggered lightning emission, incoherent bremsstrahlung of the ionization trail, and direct geomagnetic synchrotron radiation from the high-energy particles in the shower. The FORTE database consists of over 4 million recorded events to date, and may include a significant number associated with cosmic rays near or beyond the Greisen-Zatsemin-Kuzmin (GZK) cutoff. As a first stage of investigation, we search for FORTE events in the period from September 1997 to December 1999 which can have been produced by Cherenkov VHF radiation from a UHE neutrino shower in the Greenland ice sheet. After application of several background rejection methods, one event is left that requires further investigation.

Paper Details

Date Published: 3 March 2003
PDF: 9 pages
Proc. SPIE 4858, Particle Astrophysics Instrumentation, (3 March 2003); doi: 10.1117/12.458545
Show Author Affiliations
Nikolai G. Lehtinen, Univ. of Hawaii/Manoa (United States)
Peter W. Gorham, Univ. of Hawaii/Manoa (United States)
Abram R. Jacobson, Los Alamos National Lab. (United States)
Robert A. Roussel-Dupre, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 4858:
Particle Astrophysics Instrumentation
Peter W. Gorham, Editor(s)

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