Ionospheric Scintillation Effects On Dg Positioning

Paula, E. R. de; Pallaoro, Alessia; Kintner, P. M.; Beach, T. L.; Kil, H.; Kantor, I. J.; Sobral, J. H. A.; Batista, I. S.; Abdu, M. A.; Oliveira, F.C. de

doi:10.3997/2214-4609-pdb.215.sbgf171

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“…The same processes that cause scintillations can also cause disruptions in communication and global navigation systems that rely upon satellite communications. For instance, loss of lock of a GPS satellite can occur under strong scintillations [ Kintner et al , 2001] or satellite phone usage may become unavailable [ de Paula et al , 1999]. Disruptions of these types, especially in regions of large population density, can have adverse effects on the perceived reliability and dependability of such systems.…”

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confidence: 99%

Temporal properties of intense GPS L1 amplitude scintillations at midlatitudes

2004

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[1] The first observations of large-amplitude GPS L1 amplitude scintillations in the midlatitude ionosphere were made on 25-26 September 2001. The scintillations, which were intense at times (!20dB, S 4 % 0.8), occurred during the main phase of a moderate geomagnetic storm (Dst = À100 nT) when a storm-enhanced density (SED) event coupled with a broad and structured ionospheric trough occurred over the eastern United States. The preliminary results, using a modified single-frequency GPS receiver and a dualfrequency (L1/L2) GPS receiver and measuring total electron content at Cornell University (53.2°N magnetic latitude), have been published previously. In this effort we examine the scintillation autocorrelation functions using data from the fast sampling (50 Hz) single-frequency GPS receiver. The intention is to derive a measure of the scintillation pattern velocity which can be estimated from the Fresnel radius and the width of the autocorrelation function. We show that a minimum in the autocorrelation function width, corresponding to a maximum in the velocity, is located near the equatorward boundary of a broad trough. We also demonstrate that estimates of the scintillation pattern velocity are consistent with other measures of ionospheric drift in midlatitude storm time convection. In at least two of the GPS signals the inferred velocity has narrow peaks of several hundred meters per second, characteristic of subauroral ionospheric drifts (SAID) and perhaps driven by plasma pressure gradients in the inner magnetosphere. This presentation, along with the paper by Ledvina et al. [2002], strongly demonstrate that the SED and associated SAID can cause debilitating scintillation levels for GPS receivers.

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Section: Introductionmentioning

confidence: 99%

Temporal properties of intense GPS L1 amplitude scintillations at midlatitudes

2004

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First observations of intense GPS L1 amplitude scintillations at midlatitude

Ledvina

Makela

Kintner

2002

Geophysical Research Letters

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[1] First observations of intense GPS L1 amplitude scintillation activity in the midlatitude ionosphere at latitudes corresponding to the northeastern United States have been made. Moderate to severe, these scintillations result from space weather effects due to a disturbed ionosphere. Moderate to severe scintillations can degrade or even disrupt communication and navigation systems relying upon transionospheric radio wave propagation. A modified GPS receiver was used to record GPS satellite signal strength at Cornell University (53.2°m agnetic latitude) during a magnetospheric disturbance on September 25 -26, 2001 from 0000 -0400 UTC. This disturbance (K p = 6, minimum D st = À110 nT) prompted the ionospheric trough to move equatorward over the northeastern U.S. and produced large plasma densities and gradients attributed to storm-time effects. This disturbance resulted in intense L-band amplitude scintillations (!20 dB, S 4 % 0.8) which are highly uncharacteristic at this magnetic latitude. Concurrent measurements of TEC showed steep density gradients ($30 TEC/deg) and evidence of irregularity structuring.

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Ionospheric Scintillation Effects On Dg Positioning

Cited by 2 publications

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Temporal properties of intense GPS L1 amplitude scintillations at midlatitudes

Temporal properties of intense GPS L1 amplitude scintillations at midlatitudes

First observations of intense GPS L1 amplitude scintillations at midlatitude

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