Analytical model for the transit time of an interplanetary magnetic cloud

IF 1.8 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Journal of Atmospheric and Solar-Terrestrial Physics Pub Date : 2025-02-01 DOI:10.1016/j.jastp.2024.106416

E. Romashets , M. Vandas , T. Weaver , C. Bahrim

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引用次数: 0

Abstract

This paper presents an analytical model for the propagation of a toroidal interplanetary magnetic cloud from the vicinity of the Sun to Earth’s orbit. This model is applied to the May 12–15, 1997 event for calculations of cloud’s acceleration and velocity using a three forces approximation in driving the magnetic cloud’s dynamics: the diamagnetic push away from the stronger magnetic field region near the Sun, a drag force due to the ambient solar wind, and the Sun’s gravity pull. From the minimization of the difference between the calculated versus observed transit time of the magnetic cloud, we determine free parameters of our model and identify the solar source on May 12 at 5:03 UT. In situ measurements near Earth’s orbit done before May 12 set the values of the ambient interplanetary magnetic field, as well as of the ambient solar wind through which the magnetic cloud traveled. The observed temperature and density inside the magnetic cloud at Earth’s orbit determine the corresponding inner values during the magnetic cloud’s propagation. The coefficient of the drag force is one of free parameters in the model.

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来源期刊

Journal of Atmospheric and Solar-Terrestrial Physics 地学-地球化学与地球物理

CiteScore

4.10

自引率

5.30%

发文量

审稿时长

6 months

期刊介绍： The Journal of Atmospheric and Solar-Terrestrial Physics (JASTP) is an international journal concerned with the inter-disciplinary science of the Earth''s atmospheric and space environment, especially the highly varied and highly variable physical phenomena that occur in this natural laboratory and the processes that couple them. The journal covers the physical processes operating in the troposphere, stratosphere, mesosphere, thermosphere, ionosphere, magnetosphere, the Sun, interplanetary medium, and heliosphere. Phenomena occurring in other "spheres", solar influences on climate, and supporting laboratory measurements are also considered. The journal deals especially with the coupling between the different regions. Solar flares, coronal mass ejections, and other energetic events on the Sun create interesting and important perturbations in the near-Earth space environment. The physics of such "space weather" is central to the Journal of Atmospheric and Solar-Terrestrial Physics and the journal welcomes papers that lead in the direction of a predictive understanding of the coupled system. Regarding the upper atmosphere, the subjects of aeronomy, geomagnetism and geoelectricity, auroral phenomena, radio wave propagation, and plasma instabilities, are examples within the broad field of solar-terrestrial physics which emphasise the energy exchange between the solar wind, the magnetospheric and ionospheric plasmas, and the neutral gas. In the lower atmosphere, topics covered range from mesoscale to global scale dynamics, to atmospheric electricity, lightning and its effects, and to anthropogenic changes.