A 20 year decline in solar photospheric magnetic fields: Inner-heliospheric signatures and possible implications
文献类型：期刊论文
| 作者 | Janardhan, P.1; Bisoi, Susanta Kumar2; Ananthakrishnan, S.3; Tokumaru, M.4; Fujiki, K.4; Jose, L.5; Sridharan, R.5 |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
 |
| 出版日期 | 2015-07-01 |
| 卷号 | 120期号:7页码:5306-5317 |
| 关键词 | Sun activity solar wind solar-terrestrial relations |
| 英文摘要 | We report observations of a steady 20year decline of solar photospheric fields at latitudes 45 degrees starting from approximate to 1995. This prolonged and continuing decline, combined with the fact that cycle 24 is already past its peak, implies that magnetic fields are likely to continue to decline until approximate to 2020, the expected minimum of the ongoing solar cycle 24. In addition, interplanetary scintillation observations of the inner heliosphere for the period 1983-2013 and in the distance range 0.2-0.8AU have also shown a similar and steady decline in solar wind microturbulence levels, in sync with the declining photospheric fields. Using the correlation between the polar field and heliospheric magnetic field (HMF) at solar minimum, we have estimated the value of the HMF in 2020 to be 3.9 (0.6) nT and a floor value of the HMF of approximate to 3.2 (0.4) nT. Given this floor value for the HMF, our analysis suggests that the estimated peak sunspot number for solar cycle 25 is likely to be 62 (12). |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000360381400006 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5626]  |
| 专题 | 国家天文台_太阳物理研究部 |
| 作者单位 | 1.Phys Res Lab, Astron & Astrophys Div, Ahmadabad 380009, Gujarat, India 2.Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China 3.Univ Pune, Dept Elect Sci, Pune, Maharashtra, India 4.Nagoya Univ, Solar Terr Environm Lab, Nagoya, Aichi 4648601, Japan 5.Phys Res Lab, Space & Atmospher Sci Div, Ahmadabad 380009, Gujarat, India |
| 推荐引用方式 GB/T 7714 | Janardhan, P.,Bisoi, Susanta Kumar,Ananthakrishnan, S.,et al. A 20 year decline in solar photospheric magnetic fields: Inner-heliospheric signatures and possible implications[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2015,120(7):5306-5317. |
| APA | Janardhan, P..,Bisoi, Susanta Kumar.,Ananthakrishnan, S..,Tokumaru, M..,Fujiki, K..,...&Sridharan, R..(2015).A 20 year decline in solar photospheric magnetic fields: Inner-heliospheric signatures and possible implications.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,120(7),5306-5317. |
| MLA | Janardhan, P.,et al."A 20 year decline in solar photospheric magnetic fields: Inner-heliospheric signatures and possible implications".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 120.7(2015):5306-5317. |
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来源：国家天文台
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