Mathematics – Logic
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa51a1555r&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA51A-1555
Mathematics
Logic
2447 Modeling And Forecasting, 2487 Wave Propagation (0689, 3285, 4275, 4455, 6934), 6934 Ionospheric Propagation (0689, 2487, 3285, 4275, 4455), 6964 Radio Wave Propagation, 6994 Instruments And Techniques (1241)
Scientific paper
The outstanding problem faced by HF operational systems is that ionospheric weather variability is beyond current modeling capabilities. Currently only climatological modeling of the ionosphere is used to specify available HF paths. One significant problem in specifying HF propagation characteristics is the dynamic and unpredictable influence of sporadic E layer occurrence. The presence or absence of sporadic E layers often dominate the HF propagation characteristics. Space Environment Corporation has been developing a distributed sensor network of inexpensive, frequency-agile, beacon monitors that can potentially provide a real-time description of the space weather effects on HF communication systems. This array of software radios is dynamically programmed to measure GPS variations and received signal strengths from select beacons from VLF through HF along a multitude of propagation paths. Through a real-time network, the information is processed to both optimize the frequency selection of the sensors as well as to provide information about the prevailing ionospheric weather conditions. In this paper, we describe the results of a limited deployment of 7 sensors in the Western United States. These data demonstrate capability in determining the temporal, spatial, and magnitude of sporadic E events. A larger deployment of sensors can be used to map these transient structures and provide real-time HF propagation characteristics associated with strong sporadic E events. Acknowledgment: We wish to acknowledge the support of AF-SBIR Funding support through Contract FA8718-07-C-0016.
Brady J. E.
Eccles Vincent J.
Hunsucker Robert D.
Raitt William J.
Rice David
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