共查询到20条相似文献,搜索用时 31 毫秒
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《Journal of Atmospheric and Terrestrial Physics》1988,50(3):243-250
Winds data from three radar systems in the U.S.S.R. G.D.R. and Canada, which are well-spaced along the 52°N latitude circle, are used to illustrate longitudinal/regional variations in the dynamics of the upper middle atmosphere 80–97 km. Responses to the stratospheric warming of 1982/3 are noted at all three locations, but the zonal wind does not reverse at Badary, consistent with the flow there being eastward during all months of the year. Planetary wave period oscillations (2–30 days) are observed at all locations, and highly significant cross-spectral coherences exist between the three stations. 相似文献
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《Journal of Atmospheric and Terrestrial Physics》1989,51(7-8):623-626
Mean winds and tides have been measured by the LF and MF radar systems at Collm and Saskatoon respectively. Semidiurnal tide amplitudes and phases near 90 km evidence very similar monthly variations. A detailed comparison of mean wind and tidal profiles (85–110 km) in the Septembers of 4 years shows some differences however, which are consistent with regional (Europe-Canada) differences in the mean background winds. 相似文献
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《Journal of Atmospheric and Terrestrial Physics》1984,46(6-7):635-641
The potential of the EISCAT radar system for observing plasma convection patterns at high latitudes has been explored in a preliminary experiment on 27 November 1982. Using a beamswinging technique, plasma velocity was measured at slant ranges of 645–1170 km, enabling velocity vectors to be derived for invariant latitudes 70°–77°. Although operational problems limited the experiment to 80 min, some interesting observations of high-latitude flows were made. Typical afternoon westward flows of about 1 km s−1 were recorded over much of the interval, but important temporal and spatial variations were also seen as a result of the good time and space resolution of the experiment (5 min and 75 km, respectively). In particular, the westward flow was interrupted for about 10 min by a surge of poleward flow, possibly related to dynamic coupling occurring at the dayside magnetopause, such as a flux transfer event. 相似文献
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<正>东海之滨,象山半岛的最南端,将海洋文化保存最原始的古镇——石浦无时不在的大洋气息三月三踏沙滩,海钓节,开渔节,海鲜节海浪声伴着浓郁的海鲜味让人痴迷,石浦的丰富,不知从何说起……伴着海浪声,让我们到这里做个彻头彻尾的渔民 相似文献
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位于中国最北部的漠河,有着与其他地主不同的时间节奏。“一天无尽的日夜”,冬天漫长的“黑昼”,注定会给漠河人留下不一样的生活印记。 相似文献
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《Journal of Atmospheric and Terrestrial Physics》1993,55(9):1219-1231
Wind measurements using a meteor trail radar which performed during two June solstice and three December solstice months were analysed to study the tidal winds over Trivandrum (8.5°N). The ter-diurnal (8 h) component of wind was found to be as significant as the diurnal and semi-diurnal components. The modulations in the altitude profiles of amplitude and phase of the tidal wind components are interpreted to be due to higher order tidal modes. The amplitudes and vertical wavelengths of the tidal modes observed in the meteor zone are discussed. 相似文献
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一阵东风吹出来绝世景观
由市区驶到梅城旅游码头,不过短短半个小时,大家有说有笑踏上“扬帆之星”的游轮,江风拂面吹来无限的惬意,抬眼沿途尽是青山绿水构建而成的诗境.“七里扬帆”景点有“小三峡”之称,融江湖之浩瀚、峡谷之幽深、水乡之秀媚于一体,既是一条山水长廊,也是一条极富情韵的诗画长廊,引人人胜. 相似文献
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《Journal of Atmospheric and Terrestrial Physics》1994,56(6):775-782
First results on the behaviour of thermospheric temperature over Kavalur (12.5°N, 78.5°E geographic; 2.8°N geomagnetic latitude) located close to the geomagnetic equator in the Indian zone are presented. The results are based on measurements of the Doppler width of O(1D) night airglow emission at 630 nm made with a pressure-scanned Fabry-Perot interferometer (FPI) on 16 nights during March April 1992. The average nighttime (2130-0430 IST) thermospheric temperature is found to be consistently higher than the MSIS-86 predictions on all but one of the nights. The mean difference between the observed nightly temperatures and model values is 269 K with a standard error of 91 K. On one of the nights (9/10 April 1992, Ap = 6) the temperature is found to increase by ~250 K around 2330 IST and is accompanied by a ‘midnight collapse’ of the F-region over Ahmedabad (23°N, 72°E, dip 26.3°N). This relationship between the temperature increase at Kavalur and F-region height decrease at Ahmedabad is also seen in the average behaviour of the two parameters. The temperature enhancement at Kavalur is interpreted as the signature of the equatorial midnight temperature maximum (MTM) and the descent of the F-region over Ahmedabad as the effect of the poleward neutral winds associated with the MTM. 相似文献
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