The outer radiation belt consists of relativistic (>0.5 MeV) electrons trapped on closed trajectories around Earth where the magnetic field is nearly dipolar. During increased geomagnetic activity, electron intensities in the belt can vary by orders of magnitude at different spatial and temporal scales. The main phase of geomagnetic storms often produces deep depletions of electron intensities ...

We examine the effects on the mid-latitude D-region of two geomagnetic storms, the "Halloween storm" of late October 2003 and the 07 April 2000 storm, by means of the associated perturbations of several subionospheric VLF/LF signals propagating in both the northern and southern hemispheres. We use VLF/LF nighttime data from the Holographic Array for Ionospheric/Lightning Research (HAIL), locate...

The ionospheric F2-layer peak density (NmF2) and its height (hmF2) are of great influence on the shape of the ionospheric electron density profile Ne (h) and may be indicative of other physical processes within the ionosphere, especially those due to geomagnetic storms. Such parameters are often estimated using models such as the semiempirical international reference ionosphere (IRI) models or ...

We present a detailed examination of the features of the Ac-3 tive Region (AR) NOAA 10798. This AR generated coronal mass ejections 4 (CMEs) that caused a large geomagnetic storm on 24 August 2005 with the 5 minimum Dst index of −216 nT. We examined the evolution of the AR and 6 the features on/near the solar surface and in the interplanetary space. The 7 AR emerged in the middle of a small cor...

In the history of geomagnetism, geoelectricity and space science including solar terrestrial physics, ground magnetic records have been demonstrated to be a powerful tool for monitoring the levels of overall geomagnetic activity. For example, the Kp and ap indices having perhaps the long-history geomagnetic indices have and are being used as space weather parameters, where “p” stands for “plane...

geomagnetic observatories are constructed to continuously record the earth’s geomagnetic field. the importance of such buildings has resulted in an increasing construction of geomagnetic observatories all over the world. although geomagnetic observatories are sometimes unknown to most people and even some scientists, these very important data centers have been measuring the geomagnetic field fo...

An analysis is made of geophysical records the 24 March 1940, magnetic storm and related reports interference on long-line communication power systems across contiguous United States and, to a lesser extent, Canada. Most system occurred during local daytime, after second two sudden commencements early part storm's main phase. The high degree experienced this inferred have been due unusually lar...

The study of physical processes based on geomagnetic induction currents among the geophysical problems last decade is one main fundamental research. Consideration geomagnetic-induced current as a threatening "shock" aspect originally took place in NASA project "life with star", and results this working group was that must be solved combination science methods. In proposed work, calculations wer...