111 research outputs found
Morning quiet-time ionospheric current reversal at mid to high latitudes
The records of an array of magnetometers set up across the Australian mainland are examined. In addition to a well-defined current whorl corresponding to the ionospheric <i>S<sub>q</sub></i> current system, another system of eastward flowing currents is often found in the early morning. The system is most easily identified at observatories poleward of the focus of the <i>S<sub>q</sub></i> system, where a morning reversal from eastward to westward currents can be seen. The time of the reversal is usually later, sometimes up to 12h local noon, in June (Southern Winter) than in other seasons. There is some evidence of a similar current system at other longitudes and in the Northern Hemisphere. An important outcome of the study is that it enables identification of which features of a daily variation of the northward magnetic field &Delta;<i>X</i> relate to an <i>S<sub>q</sub></i> current whorl and which must be attributed to some other current system
Day-to-day variability in the occurrence characteristics of Sq focus during d-months and its association with diurnal changes in the Declination component
The daily variations of the vertical (Z) element of the geomagnetic field around the coast of mainland Australia
VHF radar studies of counter electrojet events during the northern winter solstice period of 1992
Sq and EEJ—A Review on the Daily Variation of the Geomagnetic Field Caused by Ionospheric Dynamo Currents
Supracostal access: does it affect tubeless percutaneous nephrolithotomy efficacy and safety?
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