气候变化领域集成服务门户(CCPortal): Low-Frequency Radio Observations of the “Quiet” Corona During the Descending Phase of Sunspot Cycle 24

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DOI	10.1029/2020GL090426
	Low-Frequency Radio Observations of the “Quiet” Corona During the Descending Phase of Sunspot Cycle 24
	Ramesh R.; Kumari A.; Kathiravan C.; Ketaki D.; Rajesh M.; Vrunda M.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:18
英文摘要	We carried out a statistical study of the “quiet” solar corona during the descending phase of the Sunspot Cycle 24 (i.e., January 2015 to May 2019) using data obtained with the Gauribidanur RAdioheliograPH (GRAPH) at 53 and 80 MHz simultaneously. Our results show that the equatorial (east-west) diameters of the solar corona at the above two frequencies shrunk steadily. The decrease was found to be due to a gradual reduction in the coronal electron density (Ne). Independent estimates of Ne in the equatorial region of the “background” corona using white-light coronagraph observations indicate a decline consistent with our findings. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Earth sciences; Geophysics; Equatorial regions; Low-frequency; Radio observation; Solar corona; Statistical study; Sunspot cycles; White light; Solar radiation; corona; electron density; frequency analysis; observational method; radio; solar cycle; sunspot
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169740
作者单位	Indian Institute of Astrophysics, Bangalore, India; Department of Physics, University of Helsinki, Helsinki, Finland; Department of Physics, Sir Parashurambhau College, Pune, India; Skolkovo Institute of Science and Technology, Moscow, Russian Federation
推荐引用方式 GB/T 7714	Ramesh R.,Kumari A.,Kathiravan C.,等. Low-Frequency Radio Observations of the “Quiet” Corona During the Descending Phase of Sunspot Cycle 24[J],2020,47(18).
APA	Ramesh R.,Kumari A.,Kathiravan C.,Ketaki D.,Rajesh M.,&Vrunda M..(2020).Low-Frequency Radio Observations of the “Quiet” Corona During the Descending Phase of Sunspot Cycle 24.Geophysical Research Letters,47(18).
MLA	Ramesh R.,et al."Low-Frequency Radio Observations of the “Quiet” Corona During the Descending Phase of Sunspot Cycle 24".Geophysical Research Letters 47.18(2020).