Solar activity variations of equivalent winds derived from global ionosonde data

Solar activity variations of equivalent winds derived from global ionosonde data
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根据全球电离探空仪数据得出的等效风的太阳活动变化

DOI:
10.1029/2004ja010574
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发表时间:
2004-12
期刊:
J. Geophys. Res
影响因子:
--
通讯作者:
B. Ning
B. Ning
中科院分区:
其他
文献类型:
--
作者:
Libo Liu;X. Luan;W. Wan;J. Lei;B. Ning

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Equivalentwindsarefoundofnonlinearlydecreaseddiurnalamplitudesinallseasonsatmost车站。这意味着离子阻力的增加超过了对气压梯度的补偿,从而抑制了太阳活动较高时的昼夜振幅。在太阳活动较高时,导出的等效风的日相通常较晚移动。这是第一次明确报道这一在这么多电视台出现的显著特征。另一个显着的特征是,昼夜阶段有夏季和冬季的差异。在太阳活动较高的情况下,北半球大多数站的昼夜位相在冬季晚于夏季。此外,随着太阳活动的增加,等效风的半日振幅在所考虑的大多数台站在冬季明显减少,而在其他低倾角的台站则在其他季节减弱,但在所考虑的台站的等效风的日平均和半日位相中可以发现复杂的对太阳活动的依赖性。索引术语:2427电离层:电离层/大气相互作用(0335);3369 MeteorologyandAtmosphericDynamics:Thermosphericdynamics(0358);3309MeteorologyandAtmospheric动力学:气候学(1620);2162行星际物理学:太阳周期变化(7536);关键词:电离层,气候学,太阳活动变化
equivalentwindsarefoundofnonlinearlydecreaseddiurnalamplitudesinallseasonsatmost stations. This implies that the increase in ion drag more than compensates for pressure gradients and thus restrains the diurnal amplitude at high solar activity. The diurnal phase of the derived equivalent winds generally shifts later at higher solar activity. It is the first time to explicitly report this striking feature that emerged at so many stations. Another pronounced feature is that the diurnal phase has a summer-winter difference. The diurnal phases at most stations in the Northern Hemisphere are later in winter than in summer at higher solar activity. Furthermore, a decrease in the semidiurnal amplitudes of equivalent winds with increasing solar activity is evident in winter over most stations considered and in other seasons at stations with a lower dip, but the decrease trend becomes weak in other seasonsatstationswithalargerdip.However,complicateddependencesonsolaractivitycan be found in the diurnal mean and the semidiurnal phases of equivalent winds at stations considered. INDEX TERMS: 2427 Ionosphere: Ionosphere/atmosphere interactions (0335); 3369 MeteorologyandAtmosphericDynamics:Thermosphericdynamics(0358);3309MeteorologyandAtmospheric Dynamics: Climatology (1620); 2162 Interplanetary Physics: Solar cycle variations (7536); KEYWORDS: ionosphere, climatology, solar activity variation
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