The residence-time of Jovian electrons in the inner heliosphere
The residence-time of Jovian electrons in the inner heliosphere
复制标题
木星电子在内日光层的停留时间
DOI:
10.1051/0004-6361/201936897
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发表时间:
2020
影响因子:
6.5
通讯作者:
Herbst
中科院分区:
文献类型:
--
作者:
Engelbrecht;Strauss;Herbst
ContextJovian electrons serve an important role in test-particle distribution in the inner heliosphere. They have been used extensively in the past to study the (diffusive) transport of cosmic rays in the inner heliosphere. With new limits on the Jovian source function, that is, the particle intensity just outside the Jovian magnetosphere, and a new set of in-situ observations at 1 AU for cases of both good and poor magnetic connection between the source and observer, we revisit some of these earlier simulations.AimsWe aim to find the optimal numerical set-up that can be used to simulate the propagation of 6 MeV Jovian electrons in the inner heliosphere. Using such a setup, we further aim to study the residence (propagation) times of these particles for different levels of magnetic connection between Jupiter and an observer at Earth (1 AU).MethodsUsing an advanced Jovian electron propagation model based on the stochastic differential equation approach, we calculated the Jovian electron intensity for different model parameters. A comparison with observations leads to an optimal numerical setup, which was then used to calculate the so-called residence (propagation) times of these particles.ResultsThrough a comparison with in-situ observations, we were able to derive transport parameters that are appropriate for the study of the propagation of 6 MeV Jovian electrons in the inner heliosphere. Moreover, using these values, we show that the method of calculating the residence time applied in the existing literature is not suited to being interpreted as the propagation time of physical particles. This is due to an incorrect weighting of the probability distribution. We applied a new method, where the results from each pseudo-particle are weighted by its resulting phase-space density (i.e. the number of physical particles that it represents). We thereby obtained more reliable estimates for the propagation time.
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DOI:
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发表时间:
2005
期刊:
影响因子:
--
作者:
R. B. Mckibben;J. Anglin;J. J. Connell;S. Dalla;B. Heber;H. Kunow;C. Lopate;R. Marsden;T. Sanderson;Ming Zhang
通讯作者:
Ming Zhang
DOI:
--
发表时间:
2004
期刊:
影响因子:
--
作者:
R. Kissmann;H. Fichtner;S. Ferreira
通讯作者:
S. Ferreira
DOI:
10.3847/2041-8213/aa9372
发表时间:
2017-10
期刊:
The Astrophysical Journal Letters
影响因子:
--
作者:
N. E. Engelbrecht
通讯作者:
N. E. Engelbrecht
DOI:
--
发表时间:
2008
期刊:
影响因子:
--
作者:
D. Lange;H. Fichtner
通讯作者:
H. Fichtner
DOI:
--
发表时间:
2010
期刊:
影响因子:
--
作者:
N. E. Engelbrecht;R. Burger
通讯作者:
R. Burger