Heliospheric tomography using interplanetary scintillation observations - 1. Combined Nagoya and Cambridge data
Heliospheric tomography using interplanetary scintillation observations - 1. Combined Nagoya and Cambridge data
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DOI：
10.1029/97ja02528
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发表时间：
1998-06-01
影响因子：
2.8
通讯作者：
Yokobe, A
中科院分区：
文献类型：
--
作者：
Jackson, BV;Hick, PL;Yokobe, A
我们已经制作了一个计算机辅助断层扫描程序，优化三维模型，以适应观测数据。我们已经用这个程序与行星际闪烁数据从名古屋，日本，和剑桥，英国。该程序迭代到最小二乘解拟合的观测数据，使用太阳旋转和太阳风运动，以提供观察到的空间中每个点的透视图。我们绘制的优化模型作为卡林顿地图的速度V和密度N-e的两个数据集的分辨率为10度的日射经度和纬度。我们将模型映射到1 Au，并将其与IMP航天器的原位观测进行比较。从这个比较中，我们发现Delta N-e与N-e（0.3）成比例。我们绘制了外推到太阳表面的卡林顿地图，以与Yohkoh软X射线望远镜（SXT），萨克拉门托峰绿色线和Mark III K-日冕观测进行比较。在SXT数据中观测到的日冕洞（包括极洞）在太阳表面为单独旋转模拟的高速度。从剑桥闪烁水平数据模拟的高密度区域通常显示出与在Yohkoh SXT和绿色线观测中观察到的高太阳活动区域的高度相关性。在K日冕观测中，高密度区和明亮区也有一般的对应关系。
We have produced a computer assisted tomography program that optimizes a three-dimensional model to fit observational data. We have used this program with interplanetary scintillation data from Nagoya, Japan, and Cambridge, England. The program iterates to a least squares solution fit of observed data using solar rotation and solar wind motion to provide perspective views of each point in space accessible to the observations. We plot the optimized model as Carrington maps in velocity V and density N-e for the two data sets with resolutions of 10 degrees in heliographic longitude and latitude. We map the model to 1 AU and compare this to in situ observations from the IMP spacecraft. From this comparison we find Delta N-e proportional to N-e(0.3). We plot Carrington maps extrapolated to the solar surface to compare with Yohkoh Soft X ray Telescope (SXT), Sacramento Peak green line, and Mark III K-coronameter observations. High velocities modeled at the solar surface for individual rotations trace coronal holes (including polar ones) observed in SXT data. Regions of high density modeled from the Cambridge scintillation level data generally show a high correlation with regions of high solar activity observed as bright in Yohkoh SXT and green line observations. There is also a general correspondence of the regions of high density and the areas which are bright in K-coronameter observations.