globalchange  > 科学计划与规划
DOI: 10.1002/2015GL065413
论文题名:
A new solar signal: Average maximum sunspot magnetic fields independent of activity cycle
作者: Livingston W.; Watson F.
刊名: Geophysical Research Letters
ISSN: 0094-8494
EISSN: 1944-8225
出版年: 2015
卷: 42, 期:21
起始页码: 9185
结束页码: 9189
语种: 英语
英文关键词: solar cycle ; solar photosphere ; sunspot magnetic field strengths
Scopus关键词: Magnetic fields ; Solar energy ; Activity cycles ; Field strengths ; Magnetic field strengths ; Maximum field strength ; Similar analysis ; Solar cycle ; Solar photosphere ; Zeeman splittings ; Magnetism ; flux measurement ; infrared radiation ; magnetic field ; solar activity ; solar cycle ; spatiotemporal analysis ; sunspot
英文摘要: Over the past 5 years, 2010 to April 2015, we observed 4176 sunspot umbrae in the infrared (IR) to measure maximum magnetic field strengths from the Zeeman splitting of Fe 15,648.5 Å. Herein we distinguish "field strengths" from "field flux." Field strengths range from 1500 G in pores to 3500+ in large spots. We made one observation per spot per observing day, ignoring spot size. We show that in the IR no activity cycle dependence on average maximum field strength (2070 ± 20 G) has been found. A similar analysis of 17,450 spots observed in space by the Helioseismic and Magnetic Imager reveals a similar cycle independence (2050 ± 0.18 G). We conclude that the average maximum umbral fields are constant with time and independent of the activity cycle within our time coverage. © 2015. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84954536415&doi=10.1002%2f2015GL065413&partnerID=40&md5=4918483ccf1e9475e0ac5495f2936e23
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8110
Appears in Collections:科学计划与规划
气候变化与战略

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作者单位: National Solar Observatory, Tucson, AZ, United States

Recommended Citation:
Livingston W.,Watson F.. A new solar signal: Average maximum sunspot magnetic fields independent of activity cycle[J]. Geophysical Research Letters,2015-01-01,42(21).
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