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Global Solar Magnetic Field and Interplanetary Scintillations During the Past Four Solar Cycles

文献类型：期刊论文

作者Raja, K. Sasikumar1,2; Janardhan, P.1; Bisoi, Susanta Kumar3; Ingale, Madhusudan4; Subramanian, Prasad4; Fujiki, K.5; Maksimovic, Milan2
刊名SOLAR PHYSICS
出版日期2019-09-01
卷号294期号:9页码:14
ISSN号0038-0938
关键词Magnetic fields photosphere Magnetic fields corona Magnetic fields models Sunspots magnetic fields
DOI10.1007/s11207-019-1514-7
英文摘要The extended minimum of Solar Cycle 23, the extremely quiet solar-wind conditions prevailing and the mini-maximum of Solar Cycle 24 drew global attention and many authors have since attempted to predict the amplitude of the upcoming Solar Cycle 25, which is predicted to be the third successive weak cycle; it is a unique opportunity to probe the Sun during such quiet periods. Earlier work has established a steady decline, over two decades, in solar photospheric fields at latitudes above 45 degrees and a similar decline in solar-wind micro-turbulence levels as measured by interplanetary scintillation (IPS) observations. However, the relation between the photospheric magnetic fields and those in the low corona/solar-wind are not straightforward. Therefore, in the present article, we have used potential-field source-surface (PFSS) extrapolations to deduce global magnetic fields using synoptic magnetograms observed with National Solar Observatory (NSO), Kitt Peak, USA (NSO/KP) and Solar Optical Long-term Investigation of the Sun (NSO/SOLIS) instruments during 1975 - 2018. Furthermore, we have measured the normalized scintillation index [m] using the IPS observations carried out at the Institute of Space-Earth Environment Research (ISEE), Japan during 1983 - 2017. From these observations, we have found that, since the mid-1990s, the magnetic field over different latitudes at 2.5 R-circle dot and 10 R-circle dot (extrapolated using the PFSS method) has decreased by approximate to 11.3-22.2%. In phase with the declining magnetic fields, the quantity m also declined by approximate to 23.6%. These observations emphasize the inter-relationship among the global magnetic field and various turbulence parameters in the solar corona and solar-wind.
WOS关键词DENSITY-FLUCTUATIONS ; ELECTRON-DENSITY ; WIND ; POLARIZATION ; EMISSION ; MODELS ; CORONA
资助项目Centre National d'etudes Spatiales (CNES), France
WOS研究方向Astronomy & Astrophysics
语种英语
出版者SPRINGER
WOS记录号WOS:000486152900001
资助机构Centre National d'etudes Spatiales (CNES), France ; Centre National d'etudes Spatiales (CNES), France ; Centre National d'etudes Spatiales (CNES), France ; Centre National d'etudes Spatiales (CNES), France ; Centre National d'etudes Spatiales (CNES), France ; Centre National d'etudes Spatiales (CNES), France ; Centre National d'etudes Spatiales (CNES), France ; Centre National d'etudes Spatiales (CNES), France
源URL[http://ir.bao.ac.cn/handle/114a11/27740]  
专题中国科学院国家天文台
通讯作者Raja, K. Sasikumar
作者单位1.Phys Res Lab, Ahmadabad 380009, Gujarat, India
2.Univ Paris, Sorbonne Univ, Univ PSL, LESIA,Observ Paris,CNRS, 5 Pl Jules Janssen, F-92195 Meudon, France
3.Chinese Acad Sci, Key Lab Solar Act, Natl Astron Observ, Beijing 100012, Peoples R China
4.Indian Inst Sci Educ & Res, Pune 411008, Maharashtra, India
5.Inst Space Earth Environm Res, Nagoya, Aichi, Japan
推荐引用方式
GB/T 7714		 Raja, K. Sasikumar,Janardhan, P.,Bisoi, Susanta Kumar,et al. Global Solar Magnetic Field and Interplanetary Scintillations During the Past Four Solar Cycles[J]. SOLAR PHYSICS,2019,294(9):14.
APA Raja, K. Sasikumar.,Janardhan, P..,Bisoi, Susanta Kumar.,Ingale, Madhusudan.,Subramanian, Prasad.,...&Maksimovic, Milan.(2019).Global Solar Magnetic Field and Interplanetary Scintillations During the Past Four Solar Cycles.SOLAR PHYSICS,294(9),14.
MLA Raja, K. Sasikumar,et al."Global Solar Magnetic Field and Interplanetary Scintillations During the Past Four Solar Cycles".SOLAR PHYSICS 294.9(2019):14.

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