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21.
Data from infrasound stations are used to determine the basic parameters of infrasonic waves generated during the passage and airburst of the Chelyabinsk space body: time lag, duration, spectral structure, dispersion dependence, and celerity. A simulation is performed for the parameters of the infrasonic waves. A comparison between the simulation and observation results shows a good agreement. 相似文献
22.
L. F. Chernogor 《Izvestiya Atmospheric and Oceanic Physics》2008,44(4):432-447
The results of single-type optical observations, analysis, and comparison of dynamic characteristics of the effects in the surface atmosphere that accompanied four partial solar eclipses (August 11, 1999; May 31, 2003; October 3, 2005; March 29, 2006) near the city of Kharkiv (Ukraine) are presented. The effects observed in the morning, near-noon, and afternoon hours differed markedly. During the solar eclipses, the temperature of the surface atmosphere decreased by 1.3–7.3°. It was detected that, when the maximum value of the occultation function changed from 0.24 to 0.73, the standard deviation of solar-limb displacement σ S decreased by 0.14″ and 0.68″, respectively. The time of convection development was found to be 15–16 min. The parameters of dynamic processes in the surface atmosphere have been calculated and the parameters of mechanical and thermal turbulence have been estimated from the results of measurements of the statistical characteristics of the level of solar-limb tremor with invocation of theoretical relations. The solar eclipses were accompanied by quasi-periodic processes in the atmosphere, which were most likely associated with the generation and propagation of internal gravity waves. 相似文献
23.
Kinematics and Physics of Celestial Bodies - Abstract—Comprehensive modeling studies of the processes induced in all geospheres by the passage and explosion of the meteoroid near the city of... 相似文献
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25.
L. F. Chernogor 《Geomagnetism and Aeronomy》2011,51(1):116-130
The results of observation and analysis of oscillations of the geomagnetic field within the 1–1000 s range that followed the
flight of a bolide with a mass of 50 t, diameter of about 3 m, and initial kinetic energy of 1013 J at a distance of 4850
km are given. Spectral analysis of the time variations of the geomagnetic field oscillation level was performed using three
integral transformations. Four groups of disturbances to which the transport velocities of 7–8 km/s, 800–850, 300–400, and
260–280 m/s corresponded were detected and identified. The enumerated velocities are close to the velocities observed in geomagnetic
pulsations after rocket launchings from the Plesetsk and Baikonur rocket sites. The magnetometer data were confirmed by the
results of analysis of the recordings at a microbarograph located at a distance from the flight trajectory of the bolide of
4350 km. 相似文献
26.
Geomagnetism and Aeronomy - A mechanism for the generation of quasi-periodic magnetic precursors of earthquakes is proposed on the basis of air heating above an impending earthquake, the rise of... 相似文献
27.
Izvestiya, Atmospheric and Oceanic Physics - Equations for the center-of-mass speed of the parcel of heated air, the mass of the entrained cool air, and the resulting buoyancy of the entire air... 相似文献
28.
L. F. Chernogor 《Geomagnetism and Aeronomy》2016,56(5):592-603
The results of the observations of aperiodic and quasi-periodic disturbances in E and F1 ionospheric layers and air temperature variations in the surface atmosphere on the day of the solar eclipse and control days are presented. The ionospheric processes were monitored by vertical sounding Doppler radar. The measurements showed that, near the time of the maximum coverage of the solar disk, the greatest decrease in the density of electrons in the layers E and F1 was ~27%, which is close to the calculated value (25%). The solar eclipse was accompanied by the generation of traveling ionospheric disturbances with a period of 8–12 min and a relative amplitude of electron density variations of ~0.6–1.5%. Because of the haze in the surface atmosphere, its temperature, which was monitored at observation points at a distance of 50–60 km from each other did not exceed 1°C near the time of the maximum eclipse magnitude. 相似文献
29.
I. F. Domnin L. Ya. Emelyanov M. V. Lyashenko L. F. Chernogor 《Geomagnetism and Aeronomy》2014,54(5):583-592
Incoherent scatter radar observation results of the geospace response to the partial solar eclipse (SE) of January 4, 2011 (magnitude 0.78) above Kharkiv are described. The response to the SE was observed in variations in the electron concentration, electron and ion temperatures, and the vertical component of the plasma motion velocity in a wide altitude range (190–420 km). Parameters of thermal and dynamic processes in the ionosphere are theoretically calculated for the SE. It is shown that the SE resulted in significant changes in the dynamic and thermal conditions in geospace. The results show good agreement with results of an analysis of the geospace plasma responses to SEs occurring above Kharkiv in 1999–2008. 相似文献
30.
The results of observations of quasi-periodic variations of horizontal components of the geomagnetic field, the Doppler frequency shift of the radio waves reflected from the ionosphere, and observations of anomalous traces in ionograms during a catastrophe at the largest European ammunition depot on March 23, 2017, are presented. It is shown that the catastrophe was accompanied by oscillations of the geomagnetic field level (with periods from 5–6 to 13–14 min and an amplitude of 2–3 nT) and the ionospheric electron density (with periods from 14–16 to 50–60 min and a relative amplitude of ~1–10%). A mechanism for the transfer of disturbances from the catastrophe site to the ionosphere altitudes is proposed. A key role in this mechanism is played by the acoustic gravity waves generated by widespread explosions and large-scale fire events. 相似文献