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Relocatable Over-the-Horizon Radar (ROTHR) is a long range, bi-static, high frequency radar surveillance system tasked with tracking air targets over large land and ocean areas. The long ranges, together with the relatively low altitudes of the targets, require that the radar look beyond the line-of-sight, in other words, over-the-horizon (OTH). This is accomplished by refracting the signal off the ionosphere to points beyond the horizon. In order to quantify the performance of the data fusion of multiple OTH radar tracks, several Measures of Effectiveness (MOEs) have been developed that correspond to the unique technical challenges facing a single OTH radar tracking system. This paper describes appropriate MOEs arising from OTH technical issues relating to ionospheric mode identification, crossing targets, and low Doppler targets. These MOEs were chosen to be sensitive to the performance that would be expected by fusing data from two OTH radar systems having overlapping coverage.
This reprint of the second edition includes a new chapter--Space Weather Services. The purpose of this chapter is to define space weather nowcast and forecast requirements for the commercial space weather community. A nowcast is a short-range forecast usually on the order of 1 or 2 hours lead tie. This is the only textbook on the space environment written for the novice which covers all the major topics in space physics. The reader is expected to have a solid background in introductory physics; therefore, this edition is most useful as a text for senior-year college or first-year graduate students. Topics include plasma physics, solar physics, solar wind processes, geomagnetism, magnetospheric physics, physics of the neutral atmosphere, ionospheric physiionospheric variability, radiowave propagation in the ionosphere, and space environmental effects on spacecraft.