scholarly journals GNSS High-Rate Data and the Efficiency of Ionospheric Scintillation Indices

2020 ◽  
Author(s):  
Vladislav V. Demyanov ◽  
Maria A. Sergeeva ◽  
Anna S. Yasyukevich
Keyword(s):  
High Rate ◽  
Ionospheric Scintillation ◽  
Rate Data ◽  
Scintillation Indices

scholarly journals GPS phase scintillation and proxy index at high latitudes during a moderate geomagnetic storm

2013 ◽  
Vol 31 (5) ◽  
pp. 805-816 ◽  
Author(s):  
P. Prikryl ◽  
R. Ghoddousi-Fard ◽  
B. S. R. Kunduri ◽  
E. G. Thomas ◽  
A. J. Coster ◽  
...  
Keyword(s):  
Geomagnetic Storm ◽  
Solar Wind Plasma ◽  
High Rate ◽  
Ionospheric Scintillation ◽  
Plasma Stream ◽  
High Latitudes ◽  
Polar Cap ◽  
Network Chain ◽  
The Impact ◽  
Scintillation Indices

Abstract. The amplitude and phase scintillation indices are customarily obtained by specialised GPS Ionospheric Scintillation and TEC Monitors (GISTMs) from L1 signal recorded at the rate of 50 Hz. The scintillation indices S4 and σΦ are stored in real time from an array of high-rate scintillation receivers of the Canadian High Arctic Ionospheric Network (CHAIN). Ionospheric phase scintillation was observed at high latitudes during a moderate geomagnetic storm (Dst = −61 nT) that was caused by a moderate solar wind plasma stream compounded with the impact of two coronal mass ejections. The most intense phase scintillation (σΦ ~ 1 rad) occurred in the cusp and the polar cap where it was co-located with a strong ionospheric convection, an extended tongue of ionisation and dense polar cap patches that were observed with ionosondes and HF radars. At sub-auroral latitudes, a sub-auroral polarisation stream that was observed by mid-latitude radars was associated with weak scintillation (defined arbitrarily as σΦ < 0.5 rad). In the auroral zone, moderate scintillation coincided with auroral breakups observed by an all-sky imager, a riometer and a magnetometer in Yellowknife. To overcome the limited geographic coverage by GISTMs other GNSS data sampled at 1 Hz can be used to obtain scintillation proxy indices. In this study, a phase scintillation proxy index (delta phase rate, DPR) is obtained from 1-Hz data from CHAIN and other GPS receivers. The 50-Hz and 1-Hz phase scintillation indices are correlated. The percentage occurrences of σΦ > 0.1 rad and DPR > 2 mm s−1, both mapped as a function of magnetic latitude and magnetic local time, are very similar.

High rate data systems

1987 ◽  
Author(s):  
RICHARD MILLER ◽  
DAVID NICHOLS
Keyword(s):  
High Rate ◽  
Rate Data ◽  
Data Systems

CDRD High Rate Data Links Program

2014 ◽  
Author(s):  
Aria Soha ◽  
Roger Rusack ◽  
A. Finkel ◽  
T. Norbert ◽  
Alan Prosser ◽  
...  
Keyword(s):  
High Rate ◽  
Rate Data ◽  
Data Links

scholarly journals Combining High- and Low-Rate Geodetic Data Analysis for Unveiling Rapid Magma Transfer Feeding a Sequence of Violent Summit Paroxysms at Etna in Late 2015

2021 ◽  
Vol 11 (10) ◽  
pp. 4630
Author(s):  
Alessandro Bonforte ◽  
Flavio Cannavò ◽  
Salvatore Gambino ◽  
Francesco Guglielmino
Keyword(s):  
Ground Deformation ◽  
High Rate ◽  
Rate Data ◽  
Scale Analysis ◽  
Feeding System ◽  
Magma Sources ◽  
Mt Etna ◽  
Multi Temporal ◽  
Gnss Measurements ◽  
Low Rate

We propose a multi-temporal-scale analysis of ground deformation data using both high-rate tilt and GNSS measurements and the DInSAR and daily GNSS solutions in order to investigate a sequence of four paroxysmal episodes of the Voragine crater occurring in December 2015 at Mt. Etna (Italy). The analysis aimed at inferring the magma sources feeding a sequence of very violent eruptions, in order to understand the dynamics and to image the shallow feeding system of the volcano that enabled such a rapid magma accumulation and discharge. The high-rate data allowed us to constrain the sources responsible for the fast and violent dynamics of each paroxysm, while the cumulated deformation measured by DInSAR and daily GNSS solutions, over a period of 12 days encompassing the entire eruptive sequence, also showed the deeper part of the source involved in the considered period, where magma was stored. We defined the dynamics and rates of the magma transfer, with a middle-depth storage of gas-rich magma that charges, more or less continuously, a shallower level where magma stops temporarily, accumulating pressure due to the gas exsolution. This machine-gun-like mechanism could represent a general conceptual model for similar events at Etna and at all volcanoes.

High rate data transmission in the mid-latitude NVIS HF channel

2006 ◽  
Vol 153 (2) ◽  
pp. 272 ◽  
Author(s):  
S. Antoniou ◽  
L. Christofi ◽  
P.R. Green ◽  
G.F. Gott
Keyword(s):  
Data Transmission ◽  
High Rate ◽  
Rate Data ◽  
Hf Channel

Rational dither modulation: a high-rate data-hiding method invariant to gain attacks

2005 ◽  
Vol 53 (10) ◽  
pp. 3960-3975 ◽  
Author(s):  
F. Perez-Gonzalez ◽  
C. Mosquera ◽  
M. Barni ◽  
A. Abrardo
Keyword(s):  
Data Hiding ◽  
High Rate ◽  
Rate Data ◽  
Dither Modulation ◽  
Rational Dither Modulation

Self‐contained compact transmitter for high‐rate data transmission

2014 ◽  
Vol 50 (4) ◽  
pp. 316-318 ◽  
Author(s):  
M. Salehi ◽  
M. Manteghi
Keyword(s):  
Data Transmission ◽  
High Rate ◽  
Rate Data
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