A5075980506- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Earthquake Detection and Analysis
- Astro and Planetary Science
- Geophysics and Gravity Measurements
- Magnetic confinement fusion research
- Geology and Paleoclimatology Research
- Impact of Light on Environment and Health
- Tree-ring climate responses
- Solar Radiation and Photovoltaics
- GNSS positioning and interference
- Stellar, planetary, and galactic studies
- Atmospheric Ozone and Climate
- Magnetic Field Sensors Techniques
- History and Developments in Astronomy
- Climate variability and models
- Methane Hydrates and Related Phenomena
- Geophysical and Geoelectrical Methods
- Seismic Waves and Analysis
- Space Science and Extraterrestrial Life
- Lightning and Electromagnetic Phenomena
- Arctic and Antarctic ice dynamics
- Tropical and Extratropical Cyclones Research
- Cosmology and Gravitation Theories
University of Alaska Fairbanks
2015-2024
International Arctic Research Center
2007-2024
Utah AIDS Foundation
2021
University of Alaska System
1968-2019
Arctic Research Centre
2003
University of Alaska Anchorage
1993
Max Planck Institute for Astronomy
1982
Geophysical Laboratory
1961-1972
High Altitude Observatory
1967
Earth Science Institute of the Slovak Academy of Sciences
1958-1960
An attempt is made to find interplanetary magnetic field and solar-wind parameters which control the development of geomagnetic storms. For this purpose, energy flux estimated in terms Poynting (E×B/4π), its time variations are compared with rate dissipation ring-current particle injection ui(t), Joule ionosphere uj(t) auroral up(t) for 15 major A large increase u(t) associated substorm activity. Thus, ∈(t) entering magnetosphere dissipated through magneto-spheric processes within...
We have assembled and tested, in real time, a space weather modeling system that starts at the Sun extends to Earth through set of coupled, modular components. describe recent efforts improve Hakamada‐Akasofu‐Fry (HAF) solar wind model is presently used our geomagnetic storm prediction system. also present some results these improvement efforts. In related paper, Akasofu [2001] discusses first 2 decades using this as research tool for predictions. One key goal provide quantitative forecasts...
Forecasting the time of arrival at Earth interplanetary shocks following solar metric type II activity is an important first step in establishment operational space weather prediction system. The quality forecasts utmost importance. performances shock (STOA) and propagation models (ISPM) were previously evaluated by Smith et al. [2000] for 36 events. Here we use 173 events between February 1997 October 2000 to set thresholds Hakamada–Akasofu–Fry version 2 (HAFv.2) model then present results...
It is shown by a computer simulation study of the magnetosphere‐ionosphere (M‐I) coupling that an enhanced magnetospheric convection can lead to auroral substorm onset (e.g., sudden brightening arc) in about 40 min after southward turning IMF. The results show M‐I produce intense upward field‐aligned currents midnight sector near poleward boundary high‐conductance belt associated with diffuse precipitation. Two necessary conditions for are (1) polar cap potential must exceed certain value...
In order to understand propagation mechanisms of daytime Pc 3–4 magnetic pulsations with 10–70 s periods in the magnetosphere, we studied relationships among interplanetary field (IMF) observed at ISEE 3, detected GOES 2 geostationary satellite (L = 6.67, λ 106.7°W), and those ground stations College (5.6, 147.9°W), San Gabriel Canyon (1.8, 118.0°W), Ewa Beach (1.15, 158.1°W), Onagawa (1.3, 141.5°E). Activities low‐latitude compressional waves are found be weakly correlated cone angle IMF [θ...
Satellite low-frequency radio measurements have shown that auroral kilometric radiation, an intense emission from the earth's regions, is closely associated with and magnetic disturbances. In this paper a detailed investigation of relationship presented, using electrojet (AE) index as indicator disturbances Imp 6 spacecraft. This study indicates mean power flux 178-kHz radiation tends to be proportional 1.2 for AE more than 100 gamma and, less certainty, square gamma. The correlation...
As a part of the joint efforts operating six meridian chains magnetometers during IMS, magnetic records from 70 stations are used to deduce patterns electric fields and currents in high latitudes on March 17, 18, 19, 1978. First all this data set is examine fidelity AE (12) index by comparing it with (70) also AL as measure total westward electrojet intensity. The coefficients for two correlations found be more than 0.8. Then distribution both ionospheric field‐aligned currents, well field,...
Trajectories of charged particles in the trail region earth’s magnetosphere are studied numerically using a model magnetic field. It is shown that both trapped and untrapped trajectories can be categorized into three groups two dimensionless parameters. One parameters ratio x z components The other plasma sheet thickness to particle gyroradius midplane. Previous trajectory studies incorporated our classification scheme which resolves number apparent contradictory conclusions among them....