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极区电离层在磁坐标系下的世界时变化特征研究 被引量:1
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作者 武业文 刘瑞源 +4 位作者 张北辰 胡红桥 慈颖 姜明波 吕建永 《极地研究》 CAS CSCD 北大核心 2020年第4期494-503,共10页
利用太阳活动低年2007—2010共计4年的COSMIC(Constellation Observing System for Meteorology,Ionosphere,and Climate satellite)掩星观测数据,在修正地磁纬度-磁地方时标系下(地磁坐标系),计算了极区电离层平均电子含量(mPEC)表征... 利用太阳活动低年2007—2010共计4年的COSMIC(Constellation Observing System for Meteorology,Ionosphere,and Climate satellite)掩星观测数据,在修正地磁纬度-磁地方时标系下(地磁坐标系),计算了极区电离层平均电子含量(mPEC)表征极区电离层的世界时(UT)变化特征。结果表明地磁坐标系下南北极区电离层UT变化特征明显,主要是由于极区的太阳光致电离区域随UT变化所致。以mPEC表征的极区电离层电子密度UT变化规律呈正余弦型,在南北极约有12小时的相位差;南极的UT变化强度要大于北极,约是北极的2~3倍,这些特征主要归因于地理轴与地磁轴的夹角在南极大于北极。通过与地理纬度-地方时坐标系下mPEC的UT变化特征对比,发现地磁坐标系下的UT变化强度更大,原因是地磁坐标系下极区电离层的UT变化是太阳光致电离叠加水平输运调制共同作用的结果,而地理坐标系下极区电离层UT变化主要由水平输运产生。 展开更多
关键词 极区电离层 总电子含量 世界时变化 水平输运
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极点热层密度变化特征及其受太阳风扇形结构调制
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作者 郭冬杰 雷久侯 《地球物理学报》 SCIE EI CAS CSCD 北大核心 2019年第8期2785-2792,共8页
本文基于2002年至2010年的GRACE卫星的观测密度统计分析南北极点的热层大气密度的世界时(即磁地方时)变化.研究发现:在9—11月份地球处于行星际磁场为背向太阳的扇区内(背向扇区)时,南极点热层密度在约17∶00UT(13∶30MLT)达到最大值,... 本文基于2002年至2010年的GRACE卫星的观测密度统计分析南北极点的热层大气密度的世界时(即磁地方时)变化.研究发现:在9—11月份地球处于行星际磁场为背向太阳的扇区内(背向扇区)时,南极点热层密度在约17∶00UT(13∶30MLT)达到最大值,比日平均值高约22%;而在6—8月份,当地球处于行星际磁场为面向太阳的扇区内(面向扇区)时,北极点热层密度在06∶00UT(12∶30MLT)达到最大值,比日平均值高约13%.南极点的磁纬是-74°,其在15∶30UT处于磁地方时正午,恰与极尖区位置重合.北极点在5∶30UT处于磁地方时正午,此时北极点与极尖区位置最靠近.因此,极点热层大气密度的磁地方时变化可能是其周期性靠近极尖区的结果.南北极点热层密度的磁地方时变化分别在背向和面向扇区内更明显,这可能与行星际磁场By分量对南北半球密度的不同影响有关.统计结果还表明,极点热层大气密度的磁地方时变化在冬季半球内不明显.这可能是由于在冬季半球,沉降于极尖区的粒子相比夏季半球少、沉降高度低,因而能量沉降所引起的热层上部的密度增强较小. 展开更多
关键词 极点热层密度 世界时变化 磁地方时变化 太阳风扇形结构
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Timelessness and Time Dependence of Human Consciousness From a Scientific Western Viewpoint
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作者 Franz Klaus Jansen 《Journal of Philosophy Study》 2014年第8期525-536,共12页
Eastern philosophy and western science have convergent and divergent viewpoints for their explanation of consciousness. Convergence is found for the practice of meditation allowing besides a time dependent consciousne... Eastern philosophy and western science have convergent and divergent viewpoints for their explanation of consciousness. Convergence is found for the practice of meditation allowing besides a time dependent consciousness, the experience of a timeless consciousness and its beneficial effect on psychological wellbeing and medical improvements, which are confirmed by multiple scientific publications. Theories of quantum mechanics with non-locality and timelessness also show astonishing correlation to eastern philosophy, such as the theory of Penrose-Hameroff (ORC-OR), which explains consciousness by reduction of quantum superposition in the brain. Divergence appears in the interpretation of the subjective experience of timeless consciousness. In eastern philosophy, meditation at a higher level of awareness allows the personal experience of timeless and non-dual consciousness, considered as an empirical proof for the existence of pure consciousness or spirituality existing before the material world and creating it by design. Western science acknowledges the subjective, non-dual experience, and its multiple beneficial effects, however, the interpretation of spirituality designing the material universe is in disagreement with the Darwinian Theory of mutation and selection. A design should create an ideal universe without the injustice of 3% congenital birth defects and later genetic health problems. The western viewpoint of selection is more adapted to explain congenital errors. The gap between subjectivity and objectivity, the mind-body problem, is in eastern philosophy reduced to the dominance of subjectivity over objectivity, whereas western science attributes equal values to both. Nevertheless, there remains an astonishing complementarity between eastern and western practices. 展开更多
关键词 CONSCIOUSNESS MEDITATION timelessness time dependence quantum mechanics eastern philosophy western philosophy of science
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