The suggested method is aimed at studying the dynamics of the magnetospheric current systems during magnetic storms. The method is based on algorithmic solutions for processing of geomagnetic field variations, detection of local increases in geomagnetic disturbance intensity and estimation of their dynamic characteristics. Parameters of the algorithms allow us to evaluate the characteristics of...

Observations made by the DMSP F10 satellite during the recovery phase from geomagnetic disturbances in June 1991 show regions of He dominance around 830 km altitude at 09:00 MLT. These regions are co-located with a trough in ionisation observed around 55 in the winter hemisphere. Plasma temperature and concentration observations made during the severe geomagnetic storm of 24 March 1991 are used...

Numerical modelling of thermospheric temperature changes associated with periods of high geomagnetic activity are often inaccurate due to unrealistic representation of nitric oxide (NO) densities and associated 5.3-μm radiative cooling. In previous modelling studies, simplistic parameterisations of NO density and variability have often been implemented in order to constrain thermospheric temper...

Past studies of radiation belt relativistic electrons have favored active storm time periods, while the effects of small geomagnetic storms (Dst > -50 nT) have not been statistically characterized. In this timely study, given the current weak solar cycle, we identify 342 small storms from 1989 through 2000 and quantify the corresponding change in relativistic electron flux at geosynchronous orb...

A comparison tool has been developed by mapping the global GPS total electron content (TEC) and large coverage of ionospheric scintillations together on the geomagnetic latitude/magnetic local time coordinates. Using this tool, a comparison between large-scale ionospheric irregularities and scintillations is pursued during a geomagnetic storm. Irregularities, such as storm enhanced density, mid...

FPGA has found an increasingly wide utilization in automatic train control (ATC) equipment used in highspeed rail systems, which is potentially sensitive to radiation. How the space radiation caused by Geomagnetic storm affects FPGA devices was analyzed. This paper investigated the FPGA fault-tolerance techniques used nowadays and presented a new mitigation technique against upsets, duplication...

The geomagnetic horizontal (H) ®eld from the chain of nine observatories in India are used to study the storm-time and disturbance daily variations. The peak decrease in storm-time variation in H showed signi®cant enhancements at the equatorial electrojet stations over and above the normally expected decrease due to the ring current e€ects corrected for geomagnetic latitudes. The disturbance da...

FPGA has found an increasingly wide utilization in automatic train control (ATC) equipment used in highspeed rail systems, which is potentially sensitive to radiation. How the space radiation caused by Geomagnetic storm affects FPGA devices was analyzed. This paper investigated the FPGA fault-tolerant techniques used nowadays and presented a new mitigation technique based on duplication with co...

The idea of two separate storm time ring currents, a symmetric and an asymmetric one has accepted since the 1960s. The existence of a symmetric equatorial ring current was concluded from Dst. However, the asymmetric development of the low-latitude geomagnetic disturbance ®eld during storms lead to the assumption of the real existence of an asymmetric ring current. I think it is time to inquire ...

To forecast geomagnetic storms, we had examined initially observed parameters of coronal mass ejections (CMEs) and introduced an empirical storm forecast model in a previous study. Now we suggest a two-step forecast considering not only CME parameters observed in the solar vicinity but also solar wind conditions near Earth to improve the forecast capability. We consider the empirical solar wind...