Global ETD Search
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Showing 1 to 10 of 10 for “"Arecibo Observatory"”.
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Full-profile inversion of ionospheric radar data from Arecibo observatory
… uses a variant of the same approach applied to Arecibo long pulse ISR data collected during the September 2016 topside F-region ISR data campaign. Our description provides details of forward model construction, choice of spline parameters, the optimizing algorithm, and an independent electron …
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Plasma line generation and spectral estimation from Arecibo Observatory radar data
… spectral measurements can be conducted at the Arecibo Observatory, one of the most important centers in the world for research in radio astronomy, planetary radar and terrestrial aeronomy [Altschuler, 2002]. Although ISR measurements have been routinely taken at Arecibo since the early 1960s, …
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Inversion of Arecibo incoherent scatter radar coded long pulse backscatter spectra
Incoherent scatter radar (ISR) at Arecibo Observatory measures the scattering of electromagnetic waves from random density fluctuations of ionospheric plasma particles (electrons and ions). Information about particle temperatures, ion concentrations, and Doppler shifts caused by particle motions …
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Incoherent scatter radar detection of enhanced plasma line in ionospheric E-region over Arecibo
… radar (ISR) observation were conducted at the Arecibo Observatory from December 27, 2005 until January 3, 2006. From plasma line measurements that were taken during this radar campaign, we found that plasma line enhancement was quite frequently seen in the ionospheric E-region. We hypothesized …
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Intense spreading of radar echoes from ionospheric plasmas
… ionospheric plasma bubble was observed over Arecibo Observatory in Puerto Rico, inducing significant range spreading on ionograms. This phenomena may be explained by means of the E x B instability and gravitational Rayleigh-Taylor instability. A derivation of the dispersion relations for X …
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Courting Serendipity: The Search for Transient Radio Signals
… Four planetary systems were observed at the Arecibo Observatory. In 15 hours of 327 MHz observations made over the course of nine days in July, 2004, no detections were made.
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Long-pulse incoherent scatter probing of the F-region ionosphere at Arecibo
… experiments probing the F-region ionosphere at Arecibo utilize three types of transmission envelopes having different range-mixing and error statistical models on their corresponding backscattered pulse returns. The binary-coded envelope with wide bandwidth (0.44 ms duration and 220 bauds) …
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Sampling the Radio Transient Universe: Studies of Pulsars and the Search for Extraterrestrial Intelligence
… both at the Green Bank Telescope and at the Arecibo Observatory. In this work, we describe the design of the GPU spectrometer that forms part of SERENDIP VI. In the second work, we speculate on a novel search strategy for SETI, based on the idea that technological civilizations lacking the …
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Near-optimal inversion of incoherent scatter radar measurements: coding schemes, processing techniques, and experiments
… coding scheme and inversion methodology using Arecibo incoherent scatter radar (ISR) to achieve efficient, and near-optimal estimates of the key ionospheric parameters. In particular, this work considers two aspects of the ISR inversion problem: (i) ISR lag estimates at individual altitudes, …
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A Study of Dynamical and Emission Variabilities in Pulsars
… B0611+22 at both 327 MHz and 1400 MHz with the Arecibo observatory. While it was previously shown that B0611+22 has mode-switching properties, the data presented here show that this pulsar emits bursts with characteristic time-scales of several hundred seconds. At 327 MHz, the pulsar shows …