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Документы 11 - 20 из 49
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11.
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Авторы:
Baishev Dmitriy Gavrilievich, Rich F. J.
Заглавие: Undulations Observed by the DMSP Satellites during Magnetic Superstorms of November 2004

Количество страниц: 4 с.

DMSP satellite observations and magnetic measurements at the Yakutsk observatory (φ=62°N, λ=129.6°E, L=3.3) are used to investigate the characteristics of undulations of the equatorward boundary of diffuse aurora and their relationship to the Pc5 magnetic pulsations in the evening sector during two successive magnetic superstorms at the beginning of November 2004. The large-scale undulations were observed by DMSP satellites near Yakutsk (φ~59-62°) at 0924-0932 UT on November 8, 2004 during the storm recovery phase and at~0841 UT on November 10, 2004 during the main phase of storm. They had the wavelength of λ450-500 km and the the amplitude of A~150 km for the first event, and λ~250 km and A~100 km for the second event, respectively. The estimated velocity of westward propagation for undulations during the first event was equal to V~1.4 km/s. The appearance of undulations for both events near Yakutsk was accompanied by geomagnetic Pc5 pulsations with periods of ~4-8 min, registered at the station. The behavior of undulations and fast plasma flows with concurrent Pc5 pulsations is discussed.

Baishev, D. G. Undulations Observed by the DMSP Satellites during Magnetic Superstorms of November 2004 / D. G. Baishev, F. J. Rich // Solar Extreme Events Fundamental Science and Applied Aspects Nor-Amberd, Armenia 26-30 September 2005 : proceedings of the Second International Symposium / edited by A. Chilingarian and G. Karapetyan. − Erevan : Cosmic Ray Division, Alikhanyan Physics Institute, 2006. − P. 100-103.

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12.
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Авторы:
Velichko Vitaly Andreevich, Baishev Dmitriy Gavrilievich, Plotnikov Igor Yakovlevich, Skryabin Nikolay Georgievich, Boroyev Roman Nikolaevich
Заглавие: Solar X-ray Bursts as a Possible Predictor of the Magnetic Storm in November 2004

Количество страниц: 2 с.

The geomagnetic severe storm on November 7-11, 2004 had Dst=-383 nT and had probably caused by the coronal mass ejection (CME) in interplanetary space. The burst of solar X-ray preceded the halo-ejection of solar plasma. The experimental fact testifying the global response of the geomagnetic field ("crochet" type) observed after the solar flare on November 6, 2004 is given. The reaction in the geomagnetic field lasted for several hours as well as X-ray bursts registered aboard GEOS-12.

Solar X-ray Bursts as a Possible Predictor of the Magnetic Storm in November 2004 / V. A. Velichko, D. G. Baishev, I. Ya. Plotnikov, N. G. Skryabin, R. N. Boroev // Solar Extreme Events Fundamental Science and Applied Aspects Nor-Amberd, Armenia 26-30 September 2005 : proceedings of the Second International Symposium / edited by A. Chilingarian and G. Karapetyan. − Erevan : Cosmic Ray Division, Alikhanyan Physics Institute, 2006. − P. 107-108.

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13.
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Авторы:
Boroyev Roman Nikolaevich, Du A., Solovyev Stepan Ivanovich, Xu W.-Y., Chen G.-X., Velichko Vitaly Andreevich
Заглавие: Influence of IMF by on the location of western electrojets during the magnetic storm on Nov. 9-10, 2004

Количество страниц: 4 с.

The spatial-temporal distribution of westward electrojets in the northern hemisphere has been investigated using geomagnetic ground observation data for November 9-10, 2004 geomagnetic storm. It is shown that the location of the maximum westward electrojet depends on the IMF orientation. It is in the evening or morning sector when Bγ0. With the increase of positive IMF Bγ, the region of intensity maximum shifts to morning hours. Thus, the azimuthal IMF component not only controls the pattern of magnetospheric convection, but also affects the longitudinal location of the westward electrojet pattern during the magnetic storm.

Influence of IMF by on the location of western electrojets during the magnetic storm on Nov. 9-10, 2004 / R. N. Boroev, A. Du, S. I. Solovyev, W.-Y. Xu, G.-X. Chen, V. A. Velichko // Physics of auroral phenomena : proceedings of the 29th annual seminar, Apatity, 27 February–3 March 2006. – 2007. – P. 21-24.

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14.
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Авторы:
Ammosov Petr Petrovich, Gavrilyeva Galina Alekseevna
Заглавие: Observations of short-term waves with an all sky camera in the infrared oh brightness over Yakutsk

Количество страниц: 3 с.

Statistical analysis of internal gravity wave parameters registered by variations of the hydroxyl molecule emission is presented. The wave structures are detected with an all sky infrared camera at the optical station of Maimaga (φ=63° N; λ=129.50°E geographic). The data obtained for the period of 1998 to 2002 show that the small-scale internal gravity waves propagate predominantly westward. The observed wavelengths vary from 15.4 to 100 km. (the average value is ~40 km), the horizontal phase speeds are between 19 and 166 m s-¹ (the average value is ~63 m s-¹) and the estimated periods are 9-90 min (the average value is ~17 min). The wavelengths and phase speeds at high latitudes is probably due to the large intensities of the filtering winds compared to those in the middle atmosphere. The short waves (wavelengths shorter than 17.5 km) propagate in the same direction as the long ones.

Ammosov, P. P. Observations of short-term waves with an all sky camera in the infrared oh brightness over Yakutsk / P. P. Ammosov, G. A. Gavrilyeva // Physics of auroral phenomena : proceedings of the 26th annual seminar, 25 -28 February 2003. – 2003. – P. 179-181.

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15.
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Авторы:
Solovyev Stepan Ivanovich, Moiseyev Aleksey Vladimirovich, Yumoto Kiyohumi, Engebretson Mark, Du A.
Заглавие: Magnetospheric-ionospheric response to variations in the solar wind dynamic pressure during positive IMF Bz and a sharp change of IMF By direction

Количество страниц: 2 с.

Magnetospheric-ionospheric response to variations in the solar wind dynamic pressure during positive IMF Bz and a sharp change of IMF By direction : [тезисы докладов] / S. I. Solovyev, A. V. Moiseyev, K. Yumoto, M. Engebretson, A. Du // Physics of auroral phenomena : 29th annual seminar, 27 February – 3 March 2006 : abstracts. – 2006. – P. 36.

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16.
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Авторы:
Baishev Dmitriy Gavrilievich, Moiseyev Aleksey Vladimirovich, Bondar Elena Dmitrievna, Kobiakova Sargylana Egorovna, Yumoto Kiyohumi
Заглавие: MAGDAS-9 magnetometers observations of strong earthquakes

Количество страниц: 1 с.

MAGDAS-9 magnetometers observations of strong earthquakes : [тезисы докладов] / Baishev D. G., Moiseev A.V., Bondar E. D., Kobyakova S. E., Yumoto K. // 10th International conference "Problems of geocosmos", St. Petersburg, Petrodvorets, October 6-10, 2014. – St. Petersburg : [s. n.], 2014. – P. 106.

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17.
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Автор:
Boroyev Roman Nikolaevich
Заглавие: Dynamics of field-aligned currents during substorms

Количество страниц: 3 с.

Boroyev, R. N. Dynamics of field-aligned currents during substorms / R. N. Boroyev // Physics of auroral phenomena : proceedings of the 25th annual seminar, Apatity, 26 February – 1 March 2002. – 2002. – P. 9-11.

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18.
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Авторы:
Velichko Vitaly Andreevich, Boroyev Roman Nikolaevich, Plotnikov Igor Yakovlevich, Baishev Dmitriy Gavrilievich
Заглавие: Effect of Bγ IMF in substorm current wedge formation

Количество страниц: 4 с.

Based on the data of longitudinal chain of midlatitude stations in the northern hemisphere, substorm-associated field-alighned currents (FACs) are examined. A comparison of IMF component variations with surface FAC characteristics in substorm sites is performed. It is shown that the ratio between the upward and downward surface FAC intensities depends on By IMF. In this regard, the conditions are discussed that favor currents flowing from the dayside cusp to nightside auroral region. These currents, which position is dependent on By IMF direction, can be responsible for difference between the upward and downward current-wedge-associated FACs.

Effect of Bγ IMF in substorm current wedge formation / V. A. Velichko, R. N. Boroev, I. Ya. Plotnikov, D. G. Baishev // Physics of auroral phenomena : proceedings of the 26th annual seminar, 25 - 28 February 2003. – 2003. – P. 45-48.

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19.
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Авторы:
Moiseyev Aleksey Vladimirovich, Solovyev Stepan Ivanovich, Yumoto Kiyohumi, Engebretson Mark
Заглавие: Characteristics of negative sudden geomagnetic impulses: Comparison with the sudden geomagnetic impulse caused by the growth of the solar wind dynamic pressure

Количество страниц: 2 с.

Characteristics of negative sudden geomagnetic impulses: Comparison with the sudden geomagnetic impulse caused by the growth of the solar wind dynamic pressure : [тезисы докладов] / A. V. Moiseyev, S. I. Solovyev, K. Yumoto, M. Engebretson // Physics of auroral phenomena : 30th annual seminar, 27 February – 2 March 2007 : abstracts. – 2007. – P. 34-35.

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20.
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Авторы:
Moiseyev Aleksey Vladimirovich, Solovyev Stepan Ivanovich, Engebretson Mark, Yumoto Kiyohumi
Заглавие: Dependence of distribution of the sudden impulse ionospheric currents on IMF orientation during growth periods of the solar wind dynamic pressure

Количество страниц: 2 с.

Dependence of distribution of the sudden impulse ionospheric currents on IMF orientation during growth periods of the solar wind dynamic pressure : [тезисы докладов] / A. V. Moiseyev, S. I. Solovyev, K. Yumoto, M. Engebretson // Physics of auroral phenomena : 26th annual seminar, 25-28 February 2003 : abstacts. – 2003. – P. 24.

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