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Showing 1 to 20 of 36 for “"Incoherent scatter radar"”.
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Remote Sensing of the Mesosphere Using the Jicamarca Incoherent-Scatter Radar
Made available in DSpace on 2014-12-12T20:54:10Z (GMT). No. of bitstreams: 1 7524387.pdf: 8450797 bytes, checksum: 0bec28cc661cc24643ef4e724614b8c6 (MD5) Previous issue date: 1975
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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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Near-optimal inversion of incoherent scatter radar measurements: coding schemes, processing techniques, and experiments
… 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, and (ii) …
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Incoherent scatter radar detection of enhanced plasma line in ionospheric E-region over Arecibo
A series of incoherent scatter 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 …
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Incoherent Scatter Radar Observations of Dynamic Ion Composition Changes at High Latitudes during Geomagnetic Storms
… F region ion composition from field-aligned incoherent scatter radar (ISR) measurements. These methods address incoherent scatter spectra temperature-mass ambiguities by self-consistently modeling ion temperature profiles as a function of electric fields and plasma interactions with the …
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Theoretical and Experimental Study of Gravity Waves in the Ionosphere Observed With Incoherent Scatter Radar
… Ionospheric parameters observed with the incoherent scatter radars at Sondrestrom and Millstone Hill were compared with predicted results based on gravity wave theory. In the observed data, usually two types of disturbances can be identified. One is the distinct, semiperiodic traveling …
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Study of Coulomb collisions and magneto-ionic propagation effects on incoherent scatter radar measurements at Jicamarca
… and magneto-ionic propagation effects on the incoherent scatter radar measurements have been studied and analyzed in detail. The present study aims at modeling radar observations of the equatorial ionosphere carried out at the Jicamarca Radio Observatory (Lima, Peru) using antenna beams …
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Equatorial F -Region Plasma Density Estimation With Incoherent Scatter Radar Using a Transverse -Mode Differential -Phase Method
The full correlation method is formulated and applied to the June 2002 data. Compared to the differential-phase method, this method is different in the sense that it utilizes the real and imaginary parts of the cross-correlation of orthogonal antenna outputs at the high altitudes where SNR is low …
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Inversion techniques for analyzing long pulse incoherent scatter radar data with a focus on F-region ion drift estimation
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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A forward model for ionospheric soundings and its use with incoherent scatter radar data to obtain ionospheric plasma density profiles
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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A forward model for ionospheric soundings and its use with incoherent scatter radar data to obtain ionospheric plasma density profiles
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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Lidar studies of sporadic sodium layers, gravity waves and density spectra in the mesopause and stratopause regions at Urbana and Arecibo
… of a sporadic E layer by the Arecibo 430 MHz incoherent scatter radar and a sporadic Na layer by the UIUC CEDAR Na lidar are presented. The high correlation between the altitude and abundance variation of the two layers is discussed.
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MUIR Studies of nonlinear ionospheric interactions at HAARP
… site in Alaska using the co-located Modular UHF Incoherent scatter Radar (MUIR). High frequency heating of the ionosphere produced plasma wave decay processes, the signatures of which were received by MUIR and interpreted with spectral analysis in MATLAB. The most commonly observed decay scheme …
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Calibration of Jicamarca radar using F-region incoherent scatter for measurements of D-region backscatter RCS
This thesis presents calibrated radar measurements of absolute backscatter cross sections of mesospheric radar echoes observed at the Jicamarca Radio Observatory in Perú. Radar system calibration is accomplished by simulating the propagation of transmitted and backscattered radio waves through the …
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An examination of ionospheric plasma irregularities detected by the mid-latitude SuperDARN radars
The data from the new mid-latitude radars of the Super Dual Auroral Radar Network (SuperDARN) provide new types of challenges and observations. We have developed a method for identifying periods of ionospheric backscatter that increase the number of data and reduce the average velocity in agreement …
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A 3-D Model of the Auroral Ionosphere
… approaches, and is additionally compared against incoherent scatter radar data. Results from a simulation of ionospheric response to a large amplitude acoustic wave also suggests an important role for these waves in generating local dynamo currents and density variations. Results of this model …
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Estimation of ion drift velocity vector in F region ionosphere based on incoherent scattered pulse data using machine learning technique
… techniques. The computation is based on the radar data acquired with the ALTAIR (Automatic Radar Plotting Aid (ARPA) Long-Range Tracking and Instrumentation Radar) incoherent scatter radar (ISR). The line-of-sight (LOS) Doppler velocity of radar backscattered echoes can be obtained by …
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Radio and Optical Techniques for Locating Equatorial Plasma Irregularities
… of ionospheric measurements with ionosondes and incoherent scatter radar, and scintillation (fading) of trans-ionospheric radio communication and navigation signals are well-known symptoms of depletions. This dissertation describes new techniques to combine optical and radio ionospheric remote …
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Intense spreading of radar echoes from ionospheric plasmas
… ionospheric ducts [1]. Data from Arecibo incoherent scatter radar and Arecibo's CADI digisonde is examined showing strong evidence for the development of a plasma bubble following a rise in the plasma layer and the appearance of a horizontal density gradient. In one portion of the …
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F-region Dusk Ion Temperature Spikes at the Equatorward Edge of the High Latitude Convection Region
By examining continuous data from the Poker Flat Incoherent Scatter Radar (PFISR) in Poker Flat, Alaska, short-lived enhancements in the F-region ion temperature, or "Tᵢ spikes", were discovered in the evening while the radar was on the equatorward edge of the high latitude convection region. These …
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