INTER-PLANETARY SCINTILLATION MEASUREMENTS OF ELECTRON-DENSITY POWER SPECTRUM IN SOLAR-WIND
INTER-PLANETARY SCINTILLATION MEASUREMENTS OF ELECTRON-DENSITY POWER SPECTRUM IN SOLAR-WIND
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DOI：
10.1029/ja083ia04p01413
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发表时间：
1978-01-01
影响因子：
2.8
通讯作者：
HARMON, JK
中科院分区：
文献类型：
--
作者：
COLES, WA;HARMON, JK
利用74 MHz的行星际闪烁观测资料，估算了2 × 10− 3 ~ 3 × 10−2km− 1频率范围内太阳风电子密度的空间谱。从观测的时间谱估计空间谱的反演技术需要弱散射。因此，在74 MHz时，它只能应用于大于40°的太阳辐射。光谱的形状最好用双分量幂律（P（q）<$q−α）来描述，其中α在低波数时为2.7，在高波数时为3.2。偶尔，一个α 3.0给出了令人满意的描述。光谱的形状每天变化很大，但没有观察到随太阳距离的平均变化。
The Spatial spectrum of electron density in the solar wind is estimated over the frequency range 2 × 10−3to 3 × 10−2km−1by using 74 MHz observations of interplanetary scintillation. The inversion technique by which the spatial spectrum is estimated from the observed temporal spectrum requires weak scattering. Hence at 74 MHz it can only be applied for solar elongations greater than 40°. The shape of the spectrum is best described by a two‐component power law (P(q) ∝ q−α) where α ≅ 2.7 at low wave numbers and α ≅ 3.2 at higher wave numbers. Occasionally, a single α ≅ 3.0 gives a satisfactory description. The shape of the spectrum varies significantly from day to day, but no mean variation with solar distance has been observed.