The dual Tasman International Geospace Environment Radar (TIGER) HF radars regularly observe E-region echoes at sub-auroral magnetic latitudes 58–60 S including during geomagnetic storms. We present a statistical analysis of E-region backscatter observed in a period of∼2 years (late 2004–2006) by the TIGER Bruny Island and Unwin HF radars, with particular emphasis on storm-time backscatter. It ...

The 6 January 1997 and 7 April 1997 halo coronal mass ejections (CMEs) were associated with interplanetary magnetic clouds observed by WIND that led to increased geomagnetic storm activity as indicated by the hourly Dst index. A recently developed storm-prediction method is retrospectively applied to these two solar wind (SW) structures. The results are described in detail. Had the algorithm be...

The magnitude of the Disturbance Storm Time (Dst) index varied in relation to extremely small negative integer that indicated a large geomagnetic storm. sharpened variants Dst indices could describe detailed features was estimated using an algorithm through time and frequency-domain band-stop filtering remove solar-quiet variation mutual coupling effects between Earth’s rotation, Moon’s orbit, ...

The analysis of the daily numbers of Moscow ambulance calls (1979–1981), related to the myocardial infarction (MI), has been shown the seasonal variations with the profound summer minimum and winter maximum. Similar results we obtained by analyzing the 25 year (1970-1995) statistical monthly data on the death from infarction in Bulgaria. The estimated high correlation coefficient (0.84) between...

[1] First results are presented of an effort to model the storm-time distortion of the magnetic field in the inner magnetosphere using space magnetometer data. Strong geomagnetic storms are relatively rare events, represented by only a small fraction of the data used in the derivation of existing empirical geomagnetic field models. Hence using those models for the mapping of the storm-time magn...

In addition to a fast electromagnetic pulse (EMP), a high altitude nuclear burst produces a relatively slow magnetohydrodynarnic EMP (MHD EMP), whose effects are like those from solar storm geomagnetically induced currents (SS-GIC). The MHD EMP electric field E < 10 V/m and lasts < 10 sec, whereas for solar storms E > 10 V/m and lasts >10 sec. Although the solar storm electric field is lower th...

MIPAS/ENVISAT data of nighttime NO2 volume mixing ratios (VMR) from 2007 until 2012 between 40 km and 62 km altitude are compared with the geomagnetic Ap index and solar Lyman-α radiation. The local impact of variations in geomagnetic activity and solar radiation on the VMR of NO2 in the lower mesosphere and upper stratosphere in the Northern Hemisphere is investigated by means of superposed ep...

The global evolutions of f oF2 anomalies were examined for three very intense geomagnetic storms, namely the Halloween events of October–November 2003 (Event X, 29–30 October 2003, Dst −401 nT; Event Y, 20–21 November 2003, Dst −472 nT), and the largest Dst storm (Event Z, 13–14 March 1989, Dst −589 nT). For Event X, troughs (negative storms) were clearly seen for high northern and southern lat...