Sub-Auroral, Mid-Latitude, and Low-Latitude Troughs during Severe Geomagnetic Storms

Subionospheric VLF measurements of the effects of geomagnetic storms on the mid-latitude D-region

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...

Northward intrusions of low- and mid-latitude storms across the Saharo-Arabian belt during past interglacials

The rain regime of the Levant during the late Quaternary was controlled primarily by Mediterranean cyclonic systems associated with North Atlantic climate shifts. Lake levels in the Dead Sea basin have been robust recorders of the regional hydrology and generally indicate highstand (wet) conditions throughout glacial intervals and lowstands (dry) during interglacials. However, sporadic depositi...

Trans - ionospheric GPS signal delay gradients observed over mid - latitude Europe during the geomagnetic storms of October - November 2003

Ionospheric disturbances are known to have adverse effects on the satellite-based communication and navigation. One particular type of ionospheric effects, observed during major geomagnetic storms and threatening the integrity performance of both ground-based and space-based GNSS augmentation systems, is the sharp increase/decrease in the ionospheric delay that propagates in horizontal directio...

Mid-latitude Vertical Transmission of Geomagnetic Micropulsations through the Ionosphere

A case-study of the low-latitude thermosphere during geomagnetic storms and its new representation by improved MSIS model

The thermospheric temperatures from low and equatorial latitudes during geomagnetically disturbed periods are known to exhibit signi®cant deviations from atmospheric model predictions. Also, the oscillatory features seen in the observations are not accounted for by the models. A simple relation has been established between the di€erence in the observed and modelpredicted temperatures and the ra...