Showing papers in "Journal of Atmospheric and Solar-Terrestrial Physics in 2002"

TL;DR: A review and comparison of the current state of research into relativistic electron dynamics, covering simple diffusion, substorm acceleration, ULF wave acceleration, recirculation by ULF waves or plasmaspheric hiss is given in this paper.

TL;DR: In this paper, the authors describe a system that was developed at the Jet Propulsion Laboratory and used to process the GPS/MET data and compared to analyses from the European Center for Medium-range Weather Forecast (ECMWF).

TL;DR: In this article, an agreement was concluded with Geological Survey of Canada (GSC) for sending a warning alert to the Network Control Centre (CCR) before any anticipated severe geomagnetic storms.

TL;DR: In this paper, the authors used the time of group arrival (TOGA) of the VLF (3-30 kHz ) radiation from a lightning stroke to locate lightning.

TL;DR: In this paper, a global specification and forecast system for scintillation is needed in view of our increased reliance on space-based communication and navigation systems, which are vulnerable to ionospheric scintillations.

TL;DR: In this article, the authors present a detailed discussion on how electric utilities are affected by GICs and what can be accomplished to mitigate the harmful effects and why utilities respect GIC.

TL;DR: In this paper, a three-dimensional coupled model of the thermosphere, ionosphere, plasmasphere and electrodynamics has been used to investigate the dynamic and elect-rodynamic response at low latitudes during a geomagnetic storm.

TL;DR: Alignment of serial epidemiological, physiological, including electrocardiographic data with variations in galactic cosmic rays, geomagnetic activity, and atmospheric pressure suggests the possibility of links among these physical environmental variations and health risks, such as myocardial infarctions and ischemic strokes, among others.

TL;DR: In this article, a taxonomy of echo types is proposed to distinguish bottom-type, bottom-side, topside, and post-midnight irregularities in the Peruvian ionospheric electric field.

TL;DR: In this article, a simplified two-exponential version of the Greifinger-Greifinger (1978) technique was used to identify two slopes in the conductivity profile and, providing accurate results in the ELF communication band (45 − 75 Hz ), simulates too flat a frequency dependence of the quality factor within the Schumann resonance frequency range (5 − 40 Hz ).

TL;DR: In this article, the authors examined the latest progress in these studies and discuss a number of outstanding problems, dealing mostly with the large variability of the disturbance electric fields and their coupling to the high-latitude convection.

TL;DR: In this paper, the authors present results from the Time-GCM-CCM3 thermosphere-ionosphere-lower atmosphere flux-coupled model, and investigate how well the model simulates known F2-layer day/night and seasonal behaviour and patterns of day-to-day variability at seven ionosonde stations.

TL;DR: In this paper, the frequency of large-scale ionospheric plasma depletions, or plasma bubbles, over Cachoeira Paulista, with solar activity, season, and geomagnetic activity, during the period of 1977-1998, was studied based on 934 days of scanning photometers and imagers data of the atomic oxygen 630 nm nocturnal airglow.

TL;DR: In this paper, the authors review some features of charged particle dynamics during substorm dipolarization of the magnetic field lines in the inner magnetosphere, and suggest that the electric field induced by relaxation of the magnetosphere lines can play an active role in the dynamics of the ionosphere during the main phase of geomagnetic storms.

TL;DR: In this article, the 3-1 transitions of the Meinel bands were used as a proxy for atmospheric kinetic temperatures at an altitude of 3×10 −3 hPa (87 km ).

TL;DR: The performance of different kinds of models are presented in order to determine the accuracy of the different GIMs, and the obtained accuracies range from 54% corresponding to the GPS broadcast model, to about 41%, corresponding to IRI climatological model, and to less than 30% corresponds to GPS data driven models.

TL;DR: In this article, the authors evaluated global solar radiation parameterizations for a lowland and a mountain site for a long period from 1991 to 1994 using data from the World Wide Web.

TL;DR: The National Grid Company plc (NGC) is the owner and operator of one of the world's largest privatised high-voltage electric power transmission systems in England and Wales at 400 and 275 kV as discussed by the authors.

TL;DR: In this paper, a two-dimensional numerical model is used to calculate the nonlinear evolution of ion layers in ionosphere near 100 and 120 km altitude in response to neutral turbulence driven by a wind shear.

TL;DR: In this paper, the authors used the data of more than 15 GPS stations of the GPS tracking network of the International GPS Service (IGS), a horizontal resolution in the order of 500 km is achieved, the standard time resolution is 10 min.

TL;DR: In this paper, the impact of telluric current activity on the corrosion control systems for pipelines in northern regions is examined, and three specific areas of concern are identified: corrosion of the pipe during positive cycles of the tellsuric disturbances, accurate measurement of cathodic protection performance parameters, and coating damage during negative cycles of feed-forward tellurial activity.

TL;DR: The dominant interplanetary phenomena that are frequently associated with very intense magnetic storms are the Interplanetary manifestations of fast coronal mass ejections (CMEs) and the CME ejecta itself.

TL;DR: Several studies on the scaling properties of the near-Earth magnetosphere and auroral phenomena are reviewed in this article, which provide strong evidence for the multiscale, cross-scale coupling, and reorganization nature of auroral and magnetospheric phenomena, suggesting the possibility that the magnetosphere is in a forced and/or self organized critical state.

TL;DR: In this paper, the authors used the data from about 100 GPS stations located in the neighborhood of the eclipse totality phase in Europe to measure fundamental parameters of the ionospheric response to the 1999 total solar eclipse.

TL;DR: In this paper, two general circulation models (GCMs) with coupled stratospheric chemistry are used to simulate the impact of changes in solar output, showing that the difference between solar maximum and solar minimum for temperature and ozone are generally smaller than observed.

TL;DR: In this article, the occurrence of long-period wind oscillations and wind reversals in the mesosphere and lower thermosphere in relation to planetary wave activity and circulation disturbances in the stratosphere has been studied for 12 winters covering the years 1989-2000 on the basis of MF radar wind observations at Juliusruh (55°N, since 1989) and Andenes (69°N), since 1998).

TL;DR: The PSMOS Global-scale tidal variability experiment campaign of June 1-August 31, 1999, a network of radars made measurements of winds, waves and tides in the mesosphere/lower-thermosphere region over a wide range of latitudes as mentioned in this paper.

TL;DR: In this paper, the behavior of semidiurnal tides in the north and south polar MLT regions simulated by Middle Atmosphere Circulation Model at Kyushu University is described.

TL;DR: In this article, the authors investigated the ability of the GSWM-00 to simulate the solar tides in the mesopause region (90-95 km) and found that it provides an increasingly reasonable estimate of most of the tidal characteristics in the MLT region.

TL;DR: In this paper, the authors test the theoretical explanation proposed by Cox and Plane (1998) where Na + in a plasma layer is neutralized via an ion-molecule mechanism to form a sporadic sodium layer.