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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Seasonal and longitudinal variations of the solar quiet (Sq) current system during solar minimum determined by CHAMP satellite magnetic field observations
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Seasonal and longitudinal variations of the solar quiet (Sq) current system during solar minimum determined by CHAMP satellite magnetic field observations

机译：季节性和太阳能的纵向变化安静(平方)目前系统在太阳能最低由CHAMP卫星磁场观察

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摘要

Vector magnetometer observations from the Challenging Minisatellite Payload (CHAMP) satellite are used to determine the solar quiet (Sq) current system during the recent solar minimum. Observations from 2006 to 2008 are combined, and after removal of a main field model and accounting for field-aligned currents, the longitudinal and seasonal variation of the Sq currents are determined through the method of spherical harmonic analysis. Comparison with Sq currents derived from ground-based magnetometers in the African/European longitude sector reveals similar amplitudes and seasonal variations, indicating that the CHAMP observations can reliably determine the Sq current system. The seasonal variation is consistent with prior observations during solar minimum conditions and in the Northern Hemisphere exhibits a primarily annual variation with peak currents during local summer. The seasonal variation in the Southern Hemisphere is characterized by a semiannual variation with the maxima occurring around the equinoxes. Significant longitudinal variations are also observed, and they display a seasonal variability. During Northern Hemisphere summer, the predominant feature at local noon is a wave number 1 variation in longitude. During the remainder of the year, a wave 3 longitudinal structure is observed at this local time. The longitudinal variations are considered to be due to a combination of the orientation and strength of the geomagnetic field as well as the tidal winds in the lower thermosphere. Variations in tidal winds due to nonmigrating tides may influence the dynamo-generated electric fields and currents, resulting in the observed longitudinal variations of the Sq current function.
机译：矢量磁强计的观测挑战Minisatellite载荷(冠军)卫星是用于确定太阳能安静(平方)目前系统在最近的太阳能最小值。结合,在删除一个主要领域模型和会计field-aligned电流,纵向和季节性变化的平方电流通过的方法确定球面谐波分析。电流来自地面磁力计在非洲/欧洲经度部门了类似的振幅和季节性变化,表明冠军观测当前系统可靠地确定平方。季节性变化与之前是一致的在太阳能最低条件和观测主要在北半球展品在当地的年变化与峰值电流夏天。半球的特点是半年变化的最大值发生在春分和秋分。他们也观察到,显示一个季节可变性。中午在当地的主要特性是一种波1号经度的变化。剩下的一年,一波3纵向在这个当地时间结构观察。被认为是由于纵向变化的方向和力量地磁场的潮汐风在降低热大气层。由于nonmigrating潮汐潮风影响dynamo-generated电场和电流,导致观察到的纵向变化电流的平方函数。

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