Solar wind speed and its acceleration inferred using the interplanetary scintillation method in carrington rotation 1753

Solar Physics ◽  
1994 ◽  
Vol 153 (1-2) ◽  
pp. 419-435 ◽  
Author(s):  
Kazuyuki Hakamada ◽  
Masayoshi Kojima
Keyword(s):  
Solar Wind ◽  
Wind Speed ◽  
Solar Wind Speed ◽  
Carrington Rotation ◽  
Interplanetary Scintillation ◽  
Scintillation Method

Two-Station Interplanetary Scintillation Measurements of Solar Wind Speed near the Sun Using the X-band Radio Signal of the Nozomi Spacecraft

Solar Physics ◽  
2011 ◽  
Vol 276 (1-2) ◽  
pp. 315-336 ◽  
Author(s):  
M. Tokumaru ◽  
S. Fujimaki ◽  
M. Higashiyama ◽  
A. Yokobe ◽  
T. Ohmi ◽  
...  
Keyword(s):  
Solar Wind ◽  
Wind Speed ◽  
Radio Signal ◽  
Solar Wind Speed ◽  
The Sun ◽  
Interplanetary Scintillation ◽  
X Band

Comparison of single-site interplanetary scintillation solar wind speed structure with coronal features

Solar Physics ◽  
1993 ◽  
Vol 144 (2) ◽  
pp. 385-397 ◽  
Author(s):  
S. K. Alurkar ◽  
P. Janardhan ◽  
Hari Om Vats
Keyword(s):  
Solar Wind ◽  
Wind Speed ◽  
Solar Wind Speed ◽  
Single Site ◽  
Interplanetary Scintillation

Observing Interplanetary Scintillation with Dual-Antenna Interference

2020 ◽  
Author(s):  
Donghao Liu
Keyword(s):  
Solar Wind ◽  
Wind Speed ◽  
Time Resolution ◽  
Solar Wind Speed ◽  
Radio Sources ◽  
The Sun ◽  
Interplanetary Scintillation ◽  
Dual Frequency ◽  
Important Method ◽  
Interference System

<p>It is an important method to study solar wind speed through observation of Interplanetary Scintillation (IPS). There are two big antenna with multi- frequency channels simultaneous observing interplanetary scintillation in Miyun Observatories NAOC. The aperture of the antenna is 40 meters and 50 meters respectively. There are two dual-frequency channels available in these systems: 327/611 MHz and 2300/8400 MHz. We will carriy out a comparison of these method using the normalized cross-spectrum and dual- frequency IPS measurement to observing the solar wind speed. Dual-Antenna Interference system have better sensitivity and time resolution. It can observe more weak radio sources one by one around the Sun. We can obtain more solar wind information on the Solar-Terrestrial distribution. </p>

Global Distribution of the Solar Wind Speed Reconstructed from Improved Tomographic Analysis of Interplanetary Scintillation Observations between 1985 and 2019

2021 ◽  
Vol 922 (1) ◽  
pp. 73
Author(s):  
Munetoshi Tokumaru ◽  
Ken’ichi Fujiki ◽  
Masayoshi Kojima ◽  
Kazumasa Iwai
Keyword(s):  
Solar Wind ◽  
Wind Speed ◽  
Power Index ◽  
Solar Wind Speed ◽  
Global Distribution ◽  
Interplanetary Scintillation ◽  
Wind Speeds ◽  
In Situ Observations

Abstract Computer-assisted tomography (CAT) for interplanetary scintillation (IPS) observations enables the determination of the global distribution of solar wind speed. We compared solar wind speeds derived from the CAT analysis of IPS observations between 1985 and 2019 with in situ observations conducted by the near-Earth and Ulysses spacecraft. From this comparison, we found that solar wind speeds from the IPS observations for 2009–2019 were systematically higher than the in situ observations, whereas those for the period until 2008 were in good agreement with the in situ observations. Further, we found that the discrepancy between IPS and the in situ observations is improved by changing the power index of the empirical relation between the solar wind speed and density fluctuations. The CAT analysis using an optimal value for the power index determined from the comparison between IPS and in situ observations revealed long-term variations in the solar wind speed distribution over three cycles, leading to a better understanding of the time-varying global heliosphere. We found that polar solar winds become highly anisotropic at the Cycle 24/25 minimum, which is a peculiar aspect of this minimum. The IPS observations showed general agreement with the Parker Solar Probe observations around the perihelion of Orbit 1; this supports the reliability of the CAT analysis. The results of this study suggest that the physical properties of solar wind microturbulence may vary with a long-term decline in the solar activity, which provides important implication on the solar wind acceleration.

Solar wind speed within 20RSof the Sun estimated from limb coronal mass ejections

2006 ◽  
Vol 111 (A1) ◽  
Author(s):  
Tomoko Nakagawa ◽  
Nat Gopalswamy ◽  
Seiji Yashiro
Keyword(s):  
Solar Wind ◽  
Wind Speed ◽  
Coronal Mass Ejections ◽  
Solar Wind Speed ◽  
The Sun

Coronal density and the solar wind speed at all latitudes

1981 ◽  
Vol 86 (A11) ◽  
pp. 8869 ◽  
Author(s):  
D. G. Sime ◽  
B. J. Rickett
Keyword(s):  
Solar Wind ◽  
Wind Speed ◽  
Solar Wind Speed ◽  
Coronal Density
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