Radial evolution of the solar wind from IMP 8 to Voyager 2
Radial evolution of the solar wind from IMP 8 to Voyager 2
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DOI：
10.1029/94gl03273
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发表时间：
1995-02
影响因子：
5.2
通讯作者：
J. Richardson;K. Paularena;A. Lazarus;J. Belcher
中科院分区：
文献类型：
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作者：
J. Richardson;K. Paularena;A. Lazarus;J. Belcher
呈现并比较了1977年至1994年“旅行者2号”和“国际磁层探测者8号”的数据。在1到43天文单位的距离上，径向速度和温度结构保持完整，但密度结构并非如此。在1天文单位处，温度和速度变化相关且几乎同相，但在日球层外层，温度变化比速度变化提前数十天。两艘航天器都探测到了太阳活动周期变化，在太阳活动极大期附近，通量密度和动压最小。1986 - 1987年太阳活动极小期附近“旅行者2号”和“国际磁层探测者8号”观测结果之间的差异归因于太阳风特性的纬度梯度。即使在40天文单位处，也经常存在太阳自转变化。“旅行者2号”的温度剖面最符合R⁻⁰.⁴⁹±⁰.⁰¹的递减规律，远不如绝热剖面陡峭。
Voyager 2 and IMP 8 data from 1977 through 1994 are presented and compared. Radial velocity and temperature structures remain intact over the distance from 1 to 43 AU, but density structures do not. Temperature and velocity changes are correlated and nearly in phase at 1 AU, but in the outer heliosphere temperature changes lead velocity changes by tens of days. Solar cycle variations are detected by both spacecraft, with minima in flux density and dynamic pressure near solar maxima. Differences between Voyager 2 and IMP 8 observations near the solar minimum in 1986–1987 are attributed to latitudinal gradients in solar wind properties. Solar rotation variations are often present even at 40 AU. The Voyager 2 temperature profile is best fit with a R−0.49±0.01 decrease, much less steep than an adiabatic profile.