Low frequency radio observations of the ‘quiet’ corona during the descending phase of sunspot cycle 24

doi:10.1029/2020GL090426

We carried out a statistical study of the `quiet' solar corona during the descending phase of the sunspot cycle 24 (i.e. 2015 January ‐ 2019 May) using data obtained with the Gauribidanur RAdioheliograPH (GRAPH) at 53 MHz 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 (N_e). Independent estimates of N_e in the equatorial region of the `background' corona using white‐light coronagraph observations indicate a decline consistent with our findings.

DOI	10.1029/2020GL090426
	Low frequency radio observations of the ‘quiet’ corona during the descending phase of sunspot cycle 24
	R. Ramesh; A. Kumari; C. Kathiravan; D. Ketaki; M. Rajesh; M. Vrunda
	2020-09-09
发表期刊	Geophysical Research Letters
出版年	2020
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. 2015 January ‐ 2019 May) using data obtained with the Gauribidanur RAdioheliograPH (GRAPH) at 53 MHz 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 (N_e). Independent estimates of N_e in the equatorial region of the `background' corona using white‐light coronagraph observations indicate a decline consistent with our findings.
领域	气候变化
URL	查看原文
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/294002
专题	气候变化
推荐引用方式 GB/T 7714	R. Ramesh,A. Kumari,C. Kathiravan,等. Low frequency radio observations of the ‘quiet’ corona during the descending phase of sunspot cycle 24[J]. Geophysical Research Letters,2020.
APA	R. Ramesh,A. Kumari,C. Kathiravan,D. Ketaki,M. Rajesh,&M. Vrunda.(2020).Low frequency radio observations of the ‘quiet’ corona during the descending phase of sunspot cycle 24.Geophysical Research Letters.
MLA	R. Ramesh,et al."Low frequency radio observations of the ‘quiet’ corona during the descending phase of sunspot cycle 24".Geophysical Research Letters (2020).

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