Informes Técnicos
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Item Restricted Observations of E-region irregularities with ST-Radar in Piura Perú(Instituto Geofísico del Perú, 1993) Woodman Pollitt, Ronald Francisco; Rodriguez, Rodolfo; Balsley, Ben B.During a short period around the first days of february the ST radar located in the campus of the Universidad de Piura, Piura (5°S. 80,5° w), Perú, was pointed in a direction perpendicular to the magnetic field. The goal was to make a quick evaluations of the instrument as a tool to study the E-region at this altitudes. The radar has an antenna of 100m x 100m, with a transmitter with a peak power of 50 kW. A pulse width of 8 usec was used giving a range resolution of 1.2 km. The radar interpulse period was set at 1 msec, given a maximum Nyquist frequency corresponding to a doppler shift of 150 m/sec. The observations lasted several days, but only the last were successful. The first trials were made centered at noon time, influenced by our experience with the E-region echoes at the equator, since this is the time at which the equatorial echoes are the strongest. We obtained no echoes during this trials.Item Open Access Radio star scintillations at 50MHz. Produced by electrojet irregularities (Poster)(Instituto Geofísico del Perú, Radio Observatorio de Jicamarca, 1994) Woodman Pollitt, Ronald Francisco; Aquino Q., F.; Villanueva R., F.; Sarango A., M.In connection with the Shoemaker-Levy comet collision with Jupiter, scans of Hydra-A, a radio star, was made with the Jicamarca large antenna array (50 MHz), for calibration purposes. The scans were made during the day when electrojet conditions were present. lt was found that the power signature of the star scintillated as much as 40 percent with a time scale of the order of ten seconds. The scintillation is attributed to large scale E-region irregularities in the km length scale drifting at a speed of 136 m/sec. This discovery gives usan additional tool for the study of the important large scale primary irregularities in the electrojet.