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1.
The results of the modeling the anomalous behavior of the F
1 layer characteristics are presented. The anomaly lies in the jump-like variations in the critical frequency of the layer
f
0
F1 and an abnormally large f
0
F1 value for the considered season and time. The observed effect is simulated based on the propagation of a large-scale travelling
ionospheric disturbance. The quantitative values of the disturbance parameter are obtained and some peculiarities of its propagation
are analyzed. The investigation was carried out with the help of the software for automated processing of the vertical sounding
ionograms. The experimental data were obtained during the Radar-Progress project. 相似文献
2.
3.
L. A. Shchepkin G. M. Kuznetsova G. P. Kushnarenko K. G. Ratovsky 《Geomagnetism and Aeronomy》2009,49(8):1308-1310
The applicability of the method proposed by Titheridge [1995] to the estimations of the ionization vertical drift velocity
V is studied. The values of the F2-layer maximum height, h
m
F2, obtained from the measurements using the DPS-4 digital ionosonde at Irkutsk (Institute of Solar-Terrestrial Physics) in
2003–2006, are the initial data. The neutral gas parameters were calculated from the [Hedin, 1987] thermospheric model. The
obtained calculations of the vertical ionization drift velocity are estimated by comparing with the [Hedin et al., 1991] empirical
model. In some cases, good agreement with this model has been obtained. However, such agreement is registered not always,
and the cause of such discrepancies is still unclear. The diurnal variations in the vertical ionization drift velocity in
different seasons are also discussed. 相似文献
4.
A. V. Medvedev K. G. Ratovsky M. V. Tolstikov D. S. Kushnarev 《Geomagnetism and Aeronomy》2009,49(6):775-785
The method for studying the spatial-temporal structure and propagation characteristics of traveling ionospheric disturbances,
using the spectral and cross-correlation analysis of electron density disturbances at different altitudes, obtained with the
incoherent scatter radar and vertical sounding ionosonde, is considered. Different algorithms for detecting traveling ionospheric
disturbances and calculating the total vector of the disturbance propagation velocity are presented. The results of the method
application have been considered in detail, using September 11, 2005, as an example. 相似文献
5.
K. G. Ratovsky B. G. Shpynev A. G. Kim A. V. Medvedev A. P. Potekhin P. V. Petko D. S. Kushnarev 《Geomagnetism and Aeronomy》2007,47(3):351-356
The variations in the electron density measured with the incoherent scatter radar, DPS-4 digisonde, and FMCW ionosonde are compared in this work. The main regularities in differences are explained by the effect of different-scale ionospheric irregularities. Considerable morning gradients of electron density result in that ionosondes give increased values as compared to the incoherent scatter radar data. Electron density disturbances measured with different instruments can be of correlated and uncorrelated character. Uncorrelated disturbances are explained by intense medium-scale ionospheric irregularities. Correlated disturbances are caused by large-scale irregularities. Observation of such disturbances can be used to determine the velocity and direction of a disturbance. 相似文献
6.
M. V. Klimenko V. V. Klimenko K. G. Ratovsky L. P. Goncharenko 《Geomagnetism and Aeronomy》2011,51(3):364-376
This study presents the ionospheric effects caused by the series of geomagnetic storms of September 9–14, 2005. The behavior
of different ionospheric parameters over the Yakutsk, Irkutsk, Millstone Hill and Arecibo stations during the considered period
have been numerically calculated, using a global self-consistent model of the thermosphere, ionosphere, and protonosphere
(GSM TIP) developed at WD IZMI-RAN. The model calculations of disturbances of the ionospheric parameters during storms qualitatively
agree with the experimental data at these midlatitude stations. We suggest that the causes of the quantitative differences
between the model calculations and the observational data were the use of the 3-hour Kp index of geomagnetic activity and the dipole approximation of geomagnetic field in GSM TIP, with additional contributions
from the effects of solar flares which are not considered in GSM TIP. 相似文献
7.
8.
E. L. Afraimovich S. V. Voeykov N. P. Perevalova K. G. Ratovsky 《Geomagnetism and Aeronomy》2006,46(5):603-608
The intensity of large-scale traveling ionospheric disturbances (LS TIDs), registered according to measurements of the total electron content (TEC) during the magnetic storms of October 29–31, 2003, and November 7–11, 2004, has been compared with that of local electron density disturbances. The data of TEC measurements at ground-based GPS receivers located near the ionospheric stations and the corresponding values of the critical frequency of the ionospheric F region (foF2) were used for this purpose. The variations in TEC and foF2 were similar for all events mentioned above. The previous assumption that the region of thickness 150–200 km in the vicinity of the ionospheric F region mainly contributes to TEC modulation was confirmed for the cases when the electron density disturbance at an F region maximum was not more than 50%. However, this region probably becomes more extensive in vertical when the electron density disturbance in the vicinity of the ionospheric F region is about 85%. 相似文献
9.
The morphological peculiarities of the behavior of the electron density over Irkutsk (52.3° N, 104.3° E) have been investigated
by the current-median method. The observations are compared with the IRI model data at the decay phase of solar activity (2003–2006).
Systematic discrepancies between the prediction and observations are discussed. 相似文献
10.
A. P. Potekhin G. A. Zherebtsov V. I. Kurkin A. V. Medvedev K. G. Ratovsky B. G. Shpynev 《Geomagnetism and Aeronomy》2009,49(8):1218-1222
The ionospheric response in the Irkutsk region (52.3° N, 104.3° E) to the extreme geomagnetic storms of solar cycle 23 was studied based on the data of the Irkutsk incoherent scatter radar (ISR) and DPS-4 vertical sounding digital ionosonde. The deviations of parameters from the undisturbed level, i.e., from the monthly medians or the values obtained on a quiet day, were considered as an ionospheric response. Values of the electron concentration maximum (N mF2) and electron temperature (T e) at a height of 350 km were chosen as parameters. The ionospheric response is interpreted in the scope of the concept of a thermospheric storm and penetration of the magnetospheric electric field. 相似文献