DOI: 10.1002/2017JA024914
Scopus记录号: 2-s2.0-85044309203
论文题名: New Method to Calculate the Time Variation of the Force Field Parameter
作者: Santiago A. ; Lara A. ; Enríquez-Rivera O. ; Caballero-Lopez R.A.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 3 起始页码: 1731
结束页码: 1737
语种: 英语
英文关键词: cosmic rays
; force field model
; solar modulation
英文摘要: Galactic cosmic rays (CRs) entering the heliosphere are affected by interplanetary magnetic fields and solar wind disturbances resulting in the modulation of the CR total flux observed in the inner heliosphere. The so-called force field model is often used to compute the galactic CR spectrum modulated by the solar activity due to the fact that it characterizes this process by only one parameter (the modulation potential, ϕ). In this work, we present two types of an empirical simplification (ES) method used to reconstruct the time variation of the modulation potential (Δϕ). Our ES offers a simple and fast alternative to compute the Δϕ at any desired time. The first ES type is based on the empirical fact that the dependence between Δϕ and neutron monitor (NM) count rates can be parameterized by a second-degree polynomial. The second ES type is based on the assumption that there is a inverse relation between Δϕ and NM count rates. We report the parameters found for the two types, which may be used to compute Δϕ for some NMs in a very fast and efficient way. In order to test the validity of the proposed ES, we compare our results with Δϕ obtained from literature. Finally, we apply our method to obtain the proton and helium spectra of primary CRs near the Earth at four randomly selected times. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114417
Appears in Collections: 气候减缓与适应
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作者单位: Instituto de Geofísica, Universidad Nacional Autónoma de México, México City, Mexico
Recommended Citation:
Santiago A.,Lara A.,Enríquez-Rivera O.,et al. New Method to Calculate the Time Variation of the Force Field Parameter[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(3)