共查询到20条相似文献,搜索用时 15 毫秒
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The results of the cross-correlation analysis of the amplitude fluctuations of radio waves of the = 32 cm band in seven sessions of radio occultation measurements of the northern polar atmosphere of the planet are presented. The existence of the cross-correlation of fluctuations (b
0.6) is established in the altitude realizations in the interval 61.5–65.0 km for two different sessions of radio occultation. Inner layering is revealed in the upper layer of the clouds of the planet at altitudes of 61.5–65.0 km, which is specified by an enhanced turbulence of the atmosphere. It is found that the lifetime of the small-scale layered irregularities is no less than 2 days and that their horizontal extension in the meridional direction can exceed 130 km. A possible cause of the emergence of the layered structures inside the upper layer of the polar clouds of Venus is discussed. 相似文献
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A statistical comparison of failures on geosynchronous satellites in the maximum and during the decline of the 22nd solar cycle (1989–1994) with space weather parameters is carried out. A positive correlation of the rate of failures with the flux of relativistic electrons on the geosynchronous orbit and with the proton flux measured before the bow shock front is revealed. The significant positive correlation of the electron flux with the rate of failures is observed during the entire considered interval. The correlation coefficient varies in the solar activity cycle in coordination with the electron flux, and the maxima of the correlation coefficient are observed on the phase of decline of the cycle. A statistically significant positive correlation between the flux of protons with energy of more than 1 MeV and the rate of failures is revealed in the maximum of the solar cycle.__________Translated from Kosmicheskie Issledovaniya, Vol. 43, No. 3, 2005, pp. 186–193.Original Russian Text Copyright © 2005 by Romanova, Pilipenko, Yagova, Belov. 相似文献
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The methodology of physical modeling of scattering of electromagnetic waves by plasma jets and structures near a spacecraft's surface is developed. The effects of attenuation and distortion of radio signals reflected from spacecraft construction elements by plasma jets and artificial plasma structures, which arise during the operation of electric jet engines, injection of electron beams, and in the course of active and passive experiments in orbit, are experimentally investigated. 相似文献
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The GPS satellite data are used to study the dynamics of the ionospheric total electron content (TEC) over Central Europe in the summer season from June 23 to September 30, 1996. The TEC variations within the range of periods typical of the planetary waves were found to be nearly synchronous with the neutral wind variations in the mesosphere and with the variations in the occurrence of ionospheric sporadic layers. The observed TEC variations were interpreted as the result of penetration of energy carried by nonstationary Rossby waves to the upper atmospheric altitudes. 相似文献
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根据瞬时速度脉冲、逐段常量经验加速度和周期性摄动加速度模型的特点,分别给出敏感矩阵的有效计算方法,以及最小二乘批处理的设计矩阵和法方程矩阵的分块结构。该建模方法将灵敏度矩阵数值积分规模和存储规模降为O(n),而传统方法为O(n 2)。应用GRACE-A星载GPS观测数据对法方程的计算效率测试,结果表明:对于瞬时速度脉冲和逐段常量经验加速度模型,当采用伪距观测量时,法方程构建效率提高1倍;当采用伪距加载波相位观测量时,效率提高3.5倍。对于周期性摄动加速度模型,效率没有明显提高,主要原因在于模型参数较少,矩阵分块建模方法的优越性尚未体现。 相似文献
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N. A. Eismont V. V. Khrapchenkov I. E. Belova E. E. Ryazanova J. Cl. Kosik 《Cosmic Research》2002,40(1):32-36
The determination of the orientation of satellites in the INTERBALL project from a limited set of measurements is discussed. It is shown that the full set of attitude parameters can be obtained by processing only the solar sensor data. The accuracy of corresponding parameters is estimated from alternative measurements. 相似文献
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《北华航天工业学院学报》2013,(6)
文章利用廊坊市2004-2010年的统计数据,研究和分析廊坊市城镇居民的消费结构中各项消费的比重、消费增长率、消费倾向等经济参数,结果表明医疗保健、教育文化消费支出没有明显改善。最后,在定量分析的基础上,提出优化廊坊市城镇居民消费结构的建议和对策。 相似文献
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研究廊坊市农村居民消费结构,对于促进产业结构优化和全面建设小康社会有着非常重要的意义。利用2004—2010年的廊坊市农村居民消费结构的统计数据对各项消费的比重及其边际消费倾向进行分析,得出食品消费比重偏高、医疗保健和教育文化消费增加缓慢等问题,在此基础上,提出优化廊坊市农村居民消费结构的建议和对策。 相似文献
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护理专科生进行临床实习是护理专业教学过程中的重要组成部分,是学校教育的延续和深化提高过程。临床实习质量的高低直接关系到学生就业率及工作质量。研究、分析影响护理专科学生实习质量的因素,有利于改善学生的实习环境、增加学生动手机会,提高就业能力及工作质量。通过不记名方式进行问卷调查,从三个方面16项测评内容了解学生对实习质量的影响因素,并对主要影响因素进行分析。 相似文献
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The results of the determination of centimeter ( = 5 cm) radio waves absorption in the radio occultation experiments, carried out using the Venera-15and Venera-16spacecraft, are presented. The altitude distribution of the absorber substance is analyzed. The absorbing layer is shown to exist at altitudes of 64 to 58 km in the near-polar regions of the planet. At middle latitudes such an absorbing layer was not found. In the altitude range from 56 to 46 km the radio wave absorption by the sulfuric acid (H2SO4) vapor is observed. The content of the sulfuric acid vapor is shown to increase with decreasing altitude: in the mid-latitude region at altitudes of 56.7 and 53 km it equals 5 and 20 ppm, respectively, and at polar latitudes the same content of H2SO4vapor is observed at altitudes of 51.2 and 47 km, respectively. A comparison of these results with the data of radio wave absorption in the = 13 cm band, obtained in the Pioneer Venus Orbiterradio occultation experiments, leads to the conclusion that the obtained values of the sulfuric acid vapor content well agree in the regions of overlap of the data. 相似文献
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通过施加冲量的方法消除J2项摄动和大气阻力摄动对编队飞行的影响,在编队的相对构型和整体绝对位置得到控制后,研究了低轨卫星编队飞行的地面覆盖问题,最后通过算例给出了卫星编队在南北纬86°之间全球覆盖所需的时间、周期、圈数和覆盖角。计算结果表明,对于偏心率较小的低轨编队飞行,根据本文所推导公式计算出的结果是比较可靠的。 相似文献
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Statistical properties of magnetic field and plasma flux fluctuations outside the Earth’s magnetosphere are studied on various
time scales based on the INTERBALL-1 satellite data. The analysis of “rough” turbulence characteristics has shown that turbulence properties in various parts
of the magnetosheath are distinct. The spectral density of the magnetic field undergoes a break at a frequency of ∼0.5 Hz.
As a more “fine” characteristic of the fluctuations on various time scales, changes in the shape and parameters of the probability
density function were studied. The analysis of the height of a maximum of the probability density function P(0) and of the kurtosis values have shown the presence of two asymptotic modes of P(0), which are characterized by different power laws. The critical scale, on which the properties of P(0) change, corresponds, presumably, to the scales of the Larmor radius of ions. Based on the results of studying structural
functions of various orders, the conclusion is drawn that small-scale turbulence in the foreshock and magnetosheath is described
by different phenomenological models. 相似文献
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The choice of critical values for developing electron-stimulated discharges (ESDs) in insulator covers of spacecraft is substantiated. In addition, it is found that the error in determination of an estimated potential of the open surface of the quartz film 150 m thick, related to changing the lower limit of integration of the bi-Maxwellian spectrum of electrons for the case of positively charged open dielectric surface relative to the substrate, was less than 12%. 相似文献