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Source publication
In a series of previous papers, the detection of arcing on GPS, Van Allen Probe, and GEO satellites with the Arecibo Observatory Wm. E. Gordon 305 m radiotelescope has been reported and elaborated. In this paper, characteristics of the radiofrequency spectra of two true GEO satellites are reported as they were measured with the Arecibo Mock spectro...
Context in source publication
Context 1
... a spectrum where the lines are much less intense but are spread over a very wide frequency range. Although the lines here look like noise, they are some 20 dBm above the background, and so are real spectral spikes. The tec numbers indicate which arcs are represented, so these very different arc spectra were of arcs at not very different times. In Figs. 8 and 9 are the respective arc currents. Neither arc current spectrum (not shown) shows significant power above 100 MHz. Because of limitations on the number of recorded samples, the last portions of these arcs are not shown. It must be noted here that the arc current traces are very complex and non-repeating, so the idea of a "standard" arc ...
Citations
... The previous Arecibo high-power HF transmitter had a three-point transmitting geometry that could be phased to transmit OAM modes ±1, although not pure modes due to the limited number of transmitting elements. This will likely also be possible in a restored Arecibo HF facility (Ferguson et al., 2022). Although unambiguous detection of OAM mode structure requires three-axis field information, careful measurement of the phase differences in the received waves at widely separated locations can yield clues to possible OAM content of the received waves (Mohammadi et al., 2010a,b). ...
... In particular, the L = 1 mode can produce a ring-shaped beam, with no power in the center. Beam steering and multiple beams are also desirable features (Ferguson et al., 2022). These capabilities may be used in innovative plasma physics experiments, including collaborative experiments with in-situ instruments. ...
