Interplanetary scintillation observation and space weather modelling

Frontiers in Astronomy and Space Sciences

Astronomy and Space Sciences

Kairan Ying¹  Jun Cheng²  Liping Yang²  Man Zhang²  Cang Su²  Wei Wang²  Yanchen Gao³  Yihua Yan³  Ming Xiong⁴  Xueshang Feng⁵  Jiansen He⁶  Bo Li⁷  Zhenghua Huang⁷ 

[1] National Institute of Natural Hazards, Ministry of Emergency Management of the People’s Republic of China, Beijing, China;SIGMA Weather Group, State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing, China;SIGMA Weather Group, State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing, China;College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China;SIGMA Weather Group, State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing, China;College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China;HIT Institute of Space Science and Applied Technology, Shenzhen, China;SIGMA Weather Group, State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing, China;HIT Institute of Space Science and Applied Technology, Shenzhen, China;School of Earth and Space Sciences, Peking University, Beijing, China;Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, China;

关键词: interplanetary scintillation;    Fresnel diffraction;    solar wind turbulence;    computer-assisted tomography;    space weather;    coronal mass ejection;    Sun;    radio astronomy;   

DOI  :  10.3389/fspas.2023.1159166

 received in 2023-02-05, accepted in 2023-06-20,  发布年份 2023

来源: Frontiers

【 摘 要 】

Interplanetary scintillation (IPS) refers to random fluctuations in radio intensity of distant small-diameter celestial object, over time periods of the order of 1 s. The scattering and scintillation of emergent radio waves are ascribed to turbulent density irregularities transported by the ubiquitous solar wind streams. The spatial correlation length of density irregularities and the Fresnel radius of radio diffraction are two key parameters in determining the scintillation pattern. Such a scintillation pattern can be measured and correlated between multi-station radio telescopes on the Earth. Using the “phase-changing screen” scenario based on the Born approximation, the bulk-flow speed and turbulent spectrum of the solar wind streams can be extracted from the single-station power spectra fitting and the multi-station cross-correlation analysis. Moreover, a numerical computer-assisted tomography (CAT) model, iteratively fit to a large number of IPS measurements over one Carrington rotation, can be used to reconstruct the global velocity and density structures in the inner heliosphere for the purpose of space weather modelling and prediction. In this review, we interpret the underlying physics governing the IPS phenomenon caused by the solar wind turbulence, describe the power spectrum and cross correlation of IPS signals, highlight the space weather application of IPS-CAT models, and emphasize the significant benefits from international cooperation within the Worldwide IPS Stations (WIPSS) network.

【 授权许可】

Unknown   
Copyright © 2023 Xiong, Feng, Li, He, Wang, Gao, Zhang, Yang, Huang, Cheng, Su, Yan and Ying.