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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >On monthly/seasonal/longitudinal variations of equatorial irregularity occurrences and their relationship with the postsunset vertical drift velocities
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On monthly/seasonal/longitudinal variations of equatorial irregularity occurrences and their relationship with the postsunset vertical drift velocities

机译：按月/季节性/纵向的变化赤道违规事件和他们的关系postsunset垂直漂移速度

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摘要

Monthly variation of global equatorial density irregularity distribution has been obtained with the data taken by ROCSAT-1 at the 600 km topside ionosphere from March 1999 to June 2004 during high to moderate solar activity years. This global distribution of monthly irregularity occurrence rate not only provides the best spatial/temporal distribution in existence so far but also serves to fill the gap of irregularity distribution missing over some eastern Pacific region where no ground observation is available. The 5 1/2-year result of the monthly occurrence pattern indicates a smooth variation across the longitudes contrary to some beliefs that a drastic change in irregularity occurrence pattern has occurred across the eastern Pacific longitudes. Excellent agreement is noted for the current results with Aarons' (1993) conjectured sketch of the global scintillation distribution. Furthermore, the seasonal/longitudinal (s/l) variations of quiet time postsunset vertical drift velocities are found to track closely with the s/l variations of irregularity occurrences. Linear regression analysis between the vertical drift velocity and the irregularity occurrence rate indicates that the vertical drift velocities at three different longitude zones of magnetic declination have good correlations with the irregularity occurrences for all seasons. This implies that the averaged postsunset vertical drift velocity is a good indicator for the occurrences of equatorial density irregularities in a longitude region of similar magnetic declination. The smooth variation of monthly/seasonal/longitudinal distributions of the vertical drift velocities that results in the smooth variation of topside density irregularity occurrences implies that the global occurrence pattern of either distribution is controlled by the smooth global variation of the postsunset ionospheric condition, related to the magnetic declination effect and the seasonal variation of the ionospheric density level at the dip equator located with respect to the geographic equator. There seems little need to include the global distribution of instability perturbation seeds from atmospheric disturbances to complete the global distribution of topside irregularity occurrences.
机译：每月全球赤道密度的变化获得了不规则分布的数据由ROCSAT-1上部600公里从1999年3月到2004年6月期间电离层温和的太阳活动年高。每月的不规则的全球分布出现率不仅提供最好的到目前为止空间/时间分布存在但不规则的也可以来填补这一缺口对一些东太平洋分布失踪没有可用地面观测地区。5年半月度发生的结果模式表明光滑变化的经度与一些信仰,相反不规则发生剧烈的变化模式发生在东太平洋吗经度。当前结果与亚伦(1993)推测素描全球闪烁的分布。此外,季节性/纵向(s / l)安静的时间postsunset垂直变化漂移速度跟踪与发现不规则的s / l变化出现。垂直之间的线性回归分析漂移速度和不规则发生率表明,垂直漂移速度在三种不同经度区磁赤纬有良好的相关性各种季节的违规事件。意味着平均postsunset垂直漂移速度是一个很好的指标赤道密度出现违规行为在经度地区类似的磁性赤纬。每月/季节性/纵向分布导致的垂直漂移速度光滑的上部密度不均匀性的变化出现意味着全球发生控制模式的分布顺利postsunset的全球变化电离层条件,与磁场有关赤纬和季节性变化的影响在磁赤道电离层密度水平位于赤道的地理。但是需要包括全球似乎不大分布不稳定扰动种子从大气扰动来完成干舷不规则的全球分布事件。

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