The efficiency of mechanisms driving Subauroral Polarization Streams (SAPS)
The efficiency of mechanisms driving Subauroral Polarization Streams (SAPS)
复制标题
驱动亚极光偏振流（SAPS）的机制的效率
DOI：
10.5194/angeo-29-1277-2011
复制
发表时间：
2011-07
影响因子：
1.9
通讯作者：
Luehr, H.
中科院分区：
文献类型：
--
作者：
Wang, H.;Luehr, H.
抽象的。根据2001年7月至2003年6月在北方半球DMSP观测到的3663个次表层极化流事件，研究了次表层极化流发生的季节变化和日变化。它们与高纬对流电场、亚暴和电离层电导率的关系已得到解决。SAPS的发生表现出明显的季节性和日变化，发生率变化的因素为5。结果表明，对流电场对SAPS的发生起主导作用。峰值对流电场标志着SAPS的发生最大值。亚暴对SAPS的发生可能起次要作用。它解释了在十二月至期间SAPS发生率的次高值。我们的工作表明，亚暴诱导电场可以在相对低的全球对流期间发展SAPS。较低的通量管积分电导率有利于SAPS的发展。另一个主题是SAPS和亚暴阶段之间的时间关系。SAPS可以发生在亚暴开始、亚暴扩展和恢复阶段。最有可能的SAPS往往发生60分钟/45分钟后，亚暴开始在安静/更受干扰的地磁活动，分别。这表明增强的全球对流有助于SAPS在亚暴期间更快地发展。亚暴过程使SAPS的峰值等离子体速度平均仅增加5- 10%。
Abstract. We have investigated the seasonal and diurnal variation of SAPS (Subauroral Polarization Streams) occurrence based on 3663 SAPS events identified in DMSP ion drift observations in the Northern Hemisphere during July 2001 and June 2003. Their relationships with high latitude convection electric field, substorm, and ionospheric conductivity have been addressed. SAPS occurrences show a clear seasonal and diurnal variation with the occurrence rates varying by a factor of 5. It is found that the convection electric field might play a dominant role in association with SAPS occurrence. Peak convection electric fields mark the occurrence maximum of SAPS. Substorm might play a secondary role related to SAPS occurrence. It account for the secondary maximum in SAPS occurrence rate during December solstice. Our work demonstrates that the substorm induced electric field can develop SAPS during relatively low global convection. Somewhat low fluxtube-integrated conductivity is favorable for SAPS to develop. Another topic is the temporal relationship between SAPS and substorm phases. SAPS can occur at substorm onset, substorm expansion and recovery phases. Most probably SAPS tend to occur 60 min/45 min after substorm onset during quiet/more disturbed geomagnetic activity, respectively. This indicates that enhanced global convection helps SAPS to develop quicker during substorms. The peak plasma velocity of SAPS is increased on average only by 5–10 % by the substorm process.
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DOI：
10.1016/s1364-6826(00)00217-0
发表时间：
2001-07-01
影响因子：
1.9
作者：
Carpenter, DL;Smith, AJ
通讯作者：
Smith, AJ
影响因子：
--
作者：
D. Southwood;R. Wolf
通讯作者：
D. Southwood;R. Wolf
影响因子：
5.2
作者：
N. Ganushkina;T. Pulkkinen;V. Bashkirov;D. Baker;Xinlin Li
通讯作者：
N. Ganushkina;T. Pulkkinen;V. Bashkirov;D. Baker;Xinlin Li
影响因子：
5.2
作者：
N. Maynard
通讯作者：
N. Maynard
影响因子：
2.8
作者：
Fok, MC;Moore, TE;Delcourt, DC
通讯作者：
Delcourt, DC