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Fast On-orbit Recording of Transient Events, also called P94-1


Designation 24920 / 97047A
Launch date 29 Aug 1997
Country of origin United States
Mission Scientific:
Perigee/Apogee 800 km
Inclination 70°
Period 101 min
Launch vehicle Pegasus XL #17

Advanced radio frequency (RF) impulse detection and characterization experiment. Emphasis is on the measurement of electromagnetic pulses (EMP), primarily due to lightning, within a noise environment dominated by continuous wave (CW) carriers, such as TV and FM stations. Optical sensors will augment the RF system in characterizing lightning events. A principal goal is to develop a comprehensive understanding of the correlation between the optical flash and the very high frequency (VHF) emissions from lightning.

External resources


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Technical data


Prime contractor Los Alamos National Laboratory & Sandia National Lab.
Mass at launch 212 kg
Mass in orbit  
Solar array  
Stabilization 3-axis
DC power 55 W
Design lifetime 3 years

First US satellite entirely made of composite materials (the 41 kg structure was built by Composite Optics). It will feature a 10.7 m antenna

RF system: receiver covering 30-300 MHz and high speed digitizers

Optical system: coarse imager 10 x 10 km resolution

Beacon: 401.565 MHz, downlink: 2215.5 MHz

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