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Документы 71 - 80 из 115
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71.
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Авторы:
Solovyev Stepan Ivanovich, Boroyev Roman Nikolaevich, Moiseyev Aleksey Vladimirovich
Заглавие: On the relation between the SYM-H and Dst- indices during the development of magnetic storm

Количество страниц: 4 с.

The Dst-index obtained by hourly average values of the magnetic field at four stations located in various longitudinal sectors at latitudes Φ′≈20-30° is the index of magnetic field depression at low latitudes during the magnetic storm periods. Recently for the characteristics of magnetic field depression the SYM-H index has been used. It is obtained from 1 min data of the magnetic field at ~10 stations, located mainly at latitudes Φ′≈40-50° [1]. It is considered in [2-4] that the SYM-H index is an analog of Dst but with a better temporal resolution. As shown in [5], during super magnetic storms with Dst variation ≥ 400 nT, the SYM-H variations can considerably differ from Dst behavior and thus the SYM-H index is not always an analog of Dst. In this paper the relation between the Dst and SYM-H variations for magnetic storms of different intensity, with Dst varying from ~ -50 nT to -450 nT is investigated.

Solovyev, S. I. On the relation between the SYM-H and Dst- indices during the development of magnetic storm / S. I. Solovyev, R. N. Boroyev, A. V. Moiseyev // Physics of auroral phenomena : proceedings of the 28 th annual seminar, 1-4 March 2005. – 2005. – P. 48-51.

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72.
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Авторы:
Khalipov Victor Lavrentievich, Galperin Yury Ilyich, Stepanov Alexander Egorovich, Bondar Elena Dmitrievna
Заглавие: Formation of polarization jet during injection of ions into the inner magnetosphere

Количество страниц: 4 с.

Long-lasting ground based measurements of a polarization jet (PJ) by the latitudinal chain of ionospheric stations in Yakutia (3 < L < 5; MLT = UT + 9 h) and by 5 subauroral Russian stations were analyzed. A number of cases were found when PJ was recorded simultaneously with energetic ion observations by AMPTE/CCE and INTERBALL 2. The data comparison shows that at least in the considered cases of strong magnetic substorms, PJ was accompanied by strong injection of ions with the energy of ~20-50 keV and intensity of ~10 cm-² c-¹ sr-¹keV-¹. Close to the injection region in the near midnight sector no ion dispersion was observed, but in the evening sector nose events were detected. In accordance with the mechanism suggested by Southwood and Wolf (JGR, 1978, 83, 5227) PJ was observed near the equatorial boundary of energetic ion penetration into the magnetosphere. Measurements by ionosonds at different longitudes show that the westward velocity of the frontt of PJ development is close to the gradient drift velocity of 20 keV ions (forming nose events). Thus, the physical mechanism of PJ formation due to energetic ion injection during a strong substorm burst is experimentally confirmed. Satellite measurements show that in the near midnight sector energetic ions reach the shell L=3.0 in 20-30 minutes after a substorm commencement with AE>500 nT.

Formation of polarization jet during injection of ions into the inner magnetosphere / V. L. Khalipov, Yu. I. Galperin, A. E. Stepanov, E. D. Bondar // Physics of auroral phenomena : proceedings of the 25th annual seminar, Apatity, 26 February – 1 March 2002. – 2002. – P. 43-46.
DOI: 10.1016/S0273-1177(03)00016-4

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73.
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Авторы:
Skryabin Nikolay Georgievich, Samsonov Sergey Nikolaevich, Plotnikov Igor Yakovlevich
Заглавие: Influence of Jupiter on cosmic ray intensity variations

Количество страниц: 4 с.

Galactic cosmic ray (GCR) diffusion in interplanetary space depends in a certain way on the degree of regularity of the interplanetary magnetic field (IMF). The sector IMF structure is manifested in inhomogeneous GCR distribution in the heliosphere. In parallel with the usual sectors associated with solar activity, one should take into account the sectors, which are caused by the Jupiter activity. It is known that the Jupiter is a powerful regular source of high-energy electrons (0.2-40 MeV), the density of which, on the average, is many times higher than that of solar cosmic rays. The high-energy electrons are systematically registed with the 399-day period in the near-Earth space. According to estimations of the particle energy density their flux is sufficient to decrease the magnetic field in the Jovian sector and can due to corresponding large-scale inhomogeneity in the GKL distribution. Hereby, we present the evidences that the GCR diffusion is noticeably stronger in the sector where there are Jovian electrons. By data on periodic passage of those sectors near the Earth, we have treated neutron monitor data using the superposed epoch technique. The day of the Earth and Jupiter opposition is taken as a zero epoch. At large statistical data (9925 days) it is found that the GCR intensity in that period increases with an amplitude near 1%. The groud effect is manifested with the period of 399 days and its maximum time is in a certain way shifted relative to the planet opposite moment.

Skryabin, N. G. Influence of Jupiter on cosmic ray intensity variations / N. G. Skryabin, S. N. Samsonov, I. Ya. Plotnikov // Physics of auroral phenomena : proceedings of the 25th annual seminar, Apatity, 26 February – 1 March 2002. – 2002. – P. 137-139.

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74.
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Авторы:
Baishev Dmitriy Gavrilievich, Velichko Vitaly Andreevich, Antonova Elizaveta Evgenievna, Gromova Lyudmila Ivanovna, Stepanova Marina Vladimirovna, Kovrazhkin Rostislav Alekseevich, Bosqued Jean-Michel
Заглавие: Splitting of auroral electrojets: ground-based and satellite data

Количество страниц: 3 с.

Splitting of auroral electrojets: ground-based and satellite data / D. G. Baishev, V. A. Velichko, E. E. Antonova, L. I. Gromova, M. V. Stepanova, R. A. Kovrazhkin, J. M. Bosqued // Physics of auroral phenomena : proceedings of the 26th annual seminar, 25 - 28 February 2003. – 2003. – P. 9-11.

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75.
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Авторы:
Sokolov Vasiliy Dmitrievich, Danilov A. A., Samsonov Sergey Nikolaevich
Заглавие: Dependence of semi-diurnal variation of auroral absorption on a geomagnetic disturbance

Количество страниц: 4 с.

From data of riometer observations from 1986 to 1993 at stations of Kotelny Island, Tixie Bay and Zhigansk the semi-diurnal variations of occurrence frequency of auroral absorption and their dependence on geomagnetic activity have been determined. It has been found that the phase of semi-diurnal variation maximum is systematically shifted to earlier hours with the rise of geomagnetic disturbance. The reason of this experimental fact is discussed.

Sokolov, V. D. Dependence of semi-diurnal variation of auroral absorption on a geomagnetic disturbance / V. D. Sokolov, A. A. Danilov, S. N. Samsonov // Physics of auroral phenomena : proceedings of the 26th annual seminar, 25 - 28 February 2003. – 2003. – P. 91-94.

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76.
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Автор:
Gavrilyeva Galina Alekseevna
Заглавие: Measurements of the mesosphere temperature by two molecular emissions in Yakutsk (62°N, 129,5°E)

Количество страниц: 4 с.

The results of the hydroxyl and oxygen molecules rotational temperature measurements during two observational seasons 1999-2001 at Maymaga station (φ=63°N;λ=129.50°E) are presented. The rotational temperatures of OH(6,2) and O2 (0,1) bands have been measured with the infrared spectrograph equipped by the cooled CCD registration system. It is shown that the amplitude of seasonal change of hydroxyl rotational temperature is greater than the molecular oxygen variation. OH temperatures have been systematically higher the O2 ones during winter. An abrupt decrease of the O2 intensity connected with the springtime transition of the atmospheric circulation is found in both time series. For the first time a change of the temperature vertical gradient sign caused by mesopause height displacemet to a higher (winter) level was shown in the data of August-September 2001.

Gavrilyeva, G. A. Measurements of the mesosphere temperature by two molecular emissions in Yakutsk (62°N, 129,5°E) / G. A. Gavrilyeva // Physics of auroral phenomena : proceedings of the 26th annual seminar, 25 - 28 February 2003. – 2003. – P. 198-201.

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77.
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Авторы:
Solovyev Stepan Ivanovich, Moiseyev Aleksey Vladimirovich, Du A., Engebretson Mark, Newitt L. R.
Заглавие: Sources of excitation and damping of PC5 geomagnetic pulsations during the magnetic storms of october 29-31, 2003 influence of the solar wind and auroral electrojets

Количество страниц: 1 с.

Sources of excitation and damping of PC5 geomagnetic pulsations during the magnetic storms of october 29-31, 2003 influence of the solar wind and auroral electrojets : [тезисы докладов] / Solovyev S. I., Moiseyev A. V., Du A., Engebretson M., Newitt L. R. // International symposium on Solar Extreme Events of 2003 : programme and abstract book. – Москва : УНЦ ДО, 2004. – P. 59.

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78.
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Автор:
Mochanov Yuri Alekseevich
Заглавие: Early migrations to America in the light of a study of the Dyuktai paleolithic culture in Northeast Asia

Количество страниц: 13 с.

The most ancient monuments of Duktai culture were found in North America - in Alaska and the adjacent territories of Canada. At present, scientists have almost no doubt the assumption that it was from Northeast Asia (from Yakutia through Chukotka and Alaska) that the initial settlement of the New World by man took place. It is considered an axiom that America was originally deserted and that the continent was inhabited by a man of a modern physical type (Homo sapiens) from Asia through the areas adjacent to the Bering Strait, along the Bering Land Bridge connecting Chukotka with Alaska.
Древнейшие памятники дюктайской культуры найдены и в Северной Америке — на Аляске и прилегающих к ней территориях Канады.В настоящее время у ученых почти не вызывает сомнения предположение, что именно из Северо-Восточной Азии (из Якутии через Чукотку и Аляску) происходило и первоначальное заселение человеком Нового Света. Считается аксиомой, что Америка изначально была безлюдной и что континент был заселен человеком современного физического типа (Homo sapiens) из Азии через области, примыкающие к Берингову проливу, по Берингийскому сухопутному мосту, соединяющему Чукотку с Аляской.

Mochanov, Ju. A. Early migrations to America in the light of a study of the Dyuktai paleolithic culture in Northeast Asia / Ju. A. Mochanov // Early Native Americans : prehistoric demography, economy, and technology. — The Hague ; Paris ; New York : Mouton publishers, 1980. — P. 119-131.

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79.
Обложка
Авторы:
Solovyev Stepan Ivanovich, Moiseyev Aleksey Vladimirovich, Baishev Dmitriy Gavrilievich, Yumoto Kiyohumi, Engebretson Mark
Заглавие: Evidence of the Psi geomagnetic pulsations burst excitation as the direct response to the solar wind pressure pulses

Количество страниц: 2 с.

Evidence of the Psi geomagnetic pulsations burst excitation as the direct response to the solar wind pressure pulses : [тезисы докладов] / S. I. Solovyev, A. V. Moiseyev, D. G. Baishev, K. Yumoto, M. Engebretson // Physics of auroral phenomena : 24 annual seminar, 27 February - 2 March 2001. – 2001. – P. 48.

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80.
Обложка
Авторы:
Boroyev Roman Nikolaevich, Moiseyev Aleksey Vladimirovich, Solovyev Stepan Ivanovich, Yumoto Kiyohumi, Engebretson Mark
Заглавие: Development of DPY currents and auroral convection electrojets during the growth phase of a substorm accocding to geomagnetic observations data

Количество страниц: 2 с.

Development of DPY currents and auroral convection electrojets during the growth phase of a substorm accocding to geomagnetic observations data : [тезисы докладов] / R. N. Boroev, A. V. Moiseyev, S. I. Solovyev, M. Engebretson, K. Yumoto // Physics of auroral phenomena : 26th annual seminar, 25-28 February 2003 : abstacts. – 2003. – P. 21.

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