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Article
Variations of Natural Electrical Potentials in the Cryolithozone, Yakutsk
Abstract—This paper considers daily, seasonal, and interannual variations of natural potentials at two sites in the cryolithozone at the testing polygon of the Yu.G. Shafer Institute of Cosmophysical Research and...
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Article
Determination of the Enhancement in Electron Temperature in the Subauroral Ionosphere during Magnetic Storms on a Global Scale
An attempt was made to determine on a global scale the zone of enhanced electron temperature (Te) in the subauroral ionosphere during magnetic storms via the combination of Te measurement data and images of stabl...
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Article
Estimation of geomagnetic field disturbance using the wavelet transform
This paper discusses the main aspects of geomagnetic data processing using the wavelet transform. The wavelet transform is shown to be efficient for automatic extraction of unperturbed level of the horizontal ...
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Article
The development of compression long-period pulsations on the recovery phase of the magnetic storm on May 23, 2007
The features of the excitation of spatially localized long-period (10–15 min) irregular pulsations with a maximum amplitude of ~200 nT at a geomagnetic latitude of 66° in the morning sector 5 MLT are considere...
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Article
Specific features of the generation of long-periodic geomagnetic pulsations in the event on June 25, 2008
The event of the generation of long-periodic geomagnetic Pc5 pulsations occurring on June 25, 2008 under undisturbed geomagnetic conditions is considered using data from ground-based and satellite observations...
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Article
Optical observations of large-scale undulations in the 23rd cycle of solar activity
A statistical analysis of observations of large-scale undulations during the 23rd cycle of solar activity was performed using optical data from two stations: Tixie (71.6°N, 128.9°E) and Zhigansk (66.8°N, 123.4...
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Article
Electric fields and large-scale undulations in the evening sector of the diffuse auroral zone
The synchronous observations of strong electric fields and large-scale undulations observed on December 12, 2004, in the evening sector of the diffuse auroral zone 0900-1000 UT (~1700-1800 MLT) have been analy...
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Article
Variations in the geomagnetic field and auroras during the main phase of a large magnetic storm of November 20, 2003
The substorm characteristics during the main phase of a large magnetic storm of November 20, 2003, are studied based on the data of TV observations of auroras and auroral absorption at Tixie Bay station and at...
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Article
Effect of Moon phases in riometer absorption and in the ionospheric and geomagnetic parameters
Variations in the frequency of occurrence of riometer absorption, minimum frequency of reflection of the ionospheric F layer, minimum height, and height of maximum electron density of the ionospheric F layer near...
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Article
Open AccessSimultaneous DMSP, all-sky camera, and IMAGE FUV observations of the brightening arc at a substorm pseudo-breakup
Auroral particles, field-aligned currents, and plasma convections in the vicinity of the brightening arc at substorm onset are still not well understood, since it is very rare to have conjugate satellite measu...
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Article
Manifestations of sudden commencement of a severe magnetic storm of November 20, 2003, in generation of an SC pulse, P SC pulsations, and spatial modulation of the auroral brightness
The results of investigation of the geomagnetic and auroral response to the commencement of a severe magnetic storm of November 20, 2003, are presented. It is established that the onset of SC led to the bright...
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Article
Amplitude modulation of VLF emission and absorption of cosmic noise by Pc5 geomagnetic pulsations in the period of geomagnetic storms on October 30–31, 2003
Modulation of the VLF emission and riometric absorption by Pc5 geomagnetic pulsations is studied in the period of strong geomagnetic disturbances on October 30–31, 2003. Some conclusions about the regime of pitch...
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Article
Magnetic Storms in October 2003
Preliminary results of an analysis of satellite and ground-based measurements during extremely strong magnetic storms at the end of October 2003 are presented, including some numerical modeling. The geosynchro...
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Article
North-south asymmetry of the substorm intensity depending on the IMF B Y -component
The dependence of maximum variations of H-component negative bays at magnetic conjugate stations on a sign of the IMF B Y -component during the substorms of small and moderate in...