BLO GPS L1 Instrument Data
Near-real-time and summary plots have been generated from data collected
by the Space Environment Corporation GPS
L1 instrument at the Utah State University
Observatory. This instrument uses a GPS card and software called
developed at Cornell University. The system can monitor up to 12 GPS
satellites and extracts various information from the signals.
The primary purpose of this instrument is to measure scintillations in GPS signals caused by ionospheric disturbances using the S4 scintillation index. A set of S4 values is produced once a minute for each satellite as long as at least four satellites are in view. The scintillations measured by this instrument are not particularly pronounced in mid-latitudes; the equipment is running at Bear Lake to test the hardware and software interfaces.
The instrument also produces a three-dimensional position measurement once per minute as long as at least four satellites are in view. Variations in the position are due to ionospheric disturbances and other error sources, and show a correlation to geomagnetic disturbances.
For more information about the complete data sets, please contact Dr. Vince Eccles.
Daily and weekly summary plots are produced from archived data after midnight UT. The following plots and other information are available: