Energetic Particles and Magnetic Fields in the Earth's Magnetosphere and Interplanetary Space

1997 ◽  
Author(s):  
James A. Van Allen
Keyword(s):  
Magnetic Fields ◽  
Interplanetary Space ◽  
Energetic Particles ◽  
Earth’S Magnetosphere ◽  
Earth's Magnetosphere

scholarly journals Space Weather, SuperDARN and the Tasmanian Tiger

1997 ◽  
Vol 50 (4) ◽  
pp. 773 ◽  
Author(s):  
Raymond A. Greenwald
Keyword(s):  
Solar Wind ◽  
Electric Fields ◽  
Space Weather ◽  
Interplanetary Space ◽  
Rapid Evolution ◽  
Upper Atmosphere ◽  
Global Network ◽  
Pressure Gradients ◽  
Earth’S Magnetosphere ◽  
Earth's Magnetosphere

The plasma environment extending from the solar surface through interplanetary space to the outermost reaches of the Earth’s atmosphere and magnetic field is dynamic, often disturbed, and capable of harming humans and damaging manmade systems. Disturbances in this environment have been identified as space weather disturbances. At the present time there is growing interest in monitoring and predicting space weather disturbances. In this paper we present some of the difficulties involved in achieving this goal by comparing the processes that drive tropospheric-weather systems with those that drive space-weather systems in the upper atmosphere and ionosphere. The former are driven by pressure gradients which result from processes that heat and cool the atmosphere. The latter are driven by electric fields that result from interactions between the streams of ionised gases emerging from the Sun (solar wind) and the Earth’s magnetosphere. Although the dimensions of the Earth’s magnetosphere are vastly greater than those of tropospheric weather systems, the global space-weather response to changes in the solar wind is much more rapid than the response of tropospheric-weather systems to changing conditions. We shall demonstrate the rapid evolution of space-weather systems in the upper atmosphere through measurements with a global network of radars known as SuperDARN. We shall also describe how the SuperDARN network is evolving, including a newly funded Australian component known as the Tasman International Geospace Environmental Radar (TIGER).

scholarly journals Simulating radial diffusion of energetic (MeV) electrons through a model of fluctuating electric and magnetic fields

2006 ◽  
Vol 24 (10) ◽  
pp. 2583-2598 ◽  
Author(s):  
T. Sarris ◽  
X. Li ◽  
M. Temerin
Keyword(s):  
Magnetic Fields ◽  
Test Particle ◽  
Diffusion Coefficients ◽  
Radial Diffusion ◽  
Particle Simulation ◽  
Quiet Time ◽  
Earth’S Magnetosphere ◽  
Electric And Magnetic Fields ◽  
Earth's Magnetosphere ◽  
Diffusion Rates

Abstract. In the present work, a test particle simulation is performed in a model of analytic Ultra Low Frequency, ULF, perturbations in the electric and magnetic fields of the Earth's magnetosphere. The goal of this work is to examine if the radial transport of energetic particles in quiet-time ULF magnetospheric perturbations of various azimuthal mode numbers can be described as a diffusive process and be approximated by theoretically derived radial diffusion coefficients. In the model realistic compressional electromagnetic field perturbations are constructed by a superposition of a large number of propagating electric and consistent magnetic pulses. The diffusion rates of the electrons under the effect of the fluctuating fields are calculated numerically through the test-particle simulation as a function of the radial coordinate L in a dipolar magnetosphere; these calculations are then compared to the symmetric, electromagnetic radial diffusion coefficients for compressional, poloidal perturbations in the Earth's magnetosphere. In the model the amplitude of the perturbation fields can be adjusted to represent realistic states of magnetospheric activity. Similarly, the azimuthal modulation of the fields can be adjusted to represent different azimuthal modes of fluctuations and the contribution to radial diffusion from each mode can be quantified. Two simulations of quiet-time magnetospheric variability are performed: in the first simulation, diffusion due to poloidal perturbations of mode number m=1 is calculated; in the second, the diffusion rates from multiple-mode (m=0 to m=8) perturbations are calculated. The numerical calculations of the diffusion coefficients derived from the particle orbits are found to agree with the corresponding theoretical estimates of the diffusion coefficient within a factor of two.

Dynamics of the boundary of the penetration of solar energetic particles to Earth’s magnetosphere according to CORONAS-F data

2007 ◽  
Vol 41 (4) ◽  
pp. 348-353 ◽  
Author(s):  
S. N. Kuznetsov ◽  
B. Yu. Yushkov ◽  
Yu. I. Denisov ◽  
K. Kudela ◽  
I. N. Myagkova
Keyword(s):  
Energetic Particles ◽  
Solar Energetic Particles ◽  
Earth’S Magnetosphere ◽  
Earth's Magnetosphere

A model of radiation conditions during spacecraft flights in the interplanetary space and in the earth's magnetosphere

1992 ◽  
Vol 12 (2-3) ◽  
pp. 441-444 ◽  
Author(s):  
I.V. Getselev ◽  
P.P. Ignatiev ◽  
N.A. Kabashova ◽  
N.N. Kontor ◽  
A.R. Moszhukhina ◽  
...  
Keyword(s):  
Interplanetary Space ◽  
Earth’S Magnetosphere ◽  
Earth's Magnetosphere ◽  
Radiation Conditions

Source, Loss, and Transport of Energetic Particles Deep Inside Earth's Magnetosphere (L <4)

2021 ◽  
pp. 323-334
Author(s):  
Xinlin Li ◽  
Richard S. Selesnick ◽  
Hong Zhao ◽  
Daniel N. Baker ◽  
J. Bernard Blake ◽  
...  
Keyword(s):  
Energetic Particles ◽  
Earth’S Magnetosphere ◽  
Earth's Magnetosphere
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