scholarly journals New Real-Time Model May Protect Astronauts from Space Radiation

Eos ◽  
2019 ◽  
Vol 100 ◽  
Author(s):  
David Shultz
Keyword(s):  
Magnetic Field ◽  
Real Time ◽  
Energetic Particle ◽  
Solar Energetic Particle ◽  
Space Radiation ◽  
Earth’S Magnetic Field ◽  
Time Model ◽  
Solar Energetic Particle Events ◽  
Earth's Magnetic Field

Solar energetic particle events pose an acute risk to space travelers outside the protection of Earth’s magnetic field. A new initiative aims to quantify the danger.

scholarly journals Variable Ion Compositions of Solar Energetic Particle Events in the Inner Heliosphere: A Field Line Braiding Model with Compound Injections

2022 ◽  
Vol 924 (1) ◽  
pp. 22
Author(s):  
Fan Guo ◽  
Lulu Zhao ◽  
Christina M. S. Cohen ◽  
Joe Giacalone ◽  
R. A. Leske ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Energetic Particle ◽  
Radial Distance ◽  
Solar Energetic Particle ◽  
The Sun ◽  
Ion Composition ◽  
Source Regions ◽  
Solar Energetic Particle Events ◽  
Composition Ratios ◽  
Inner Heliosphere

Abstract We propose a model for interpreting highly variable ion composition ratios in solar energetic particle (SEP) events recently observed by the Parker Solar Probe (PSP) at 0.3–0.45 au. We use numerical simulations to calculate SEP propagation in a turbulent interplanetary magnetic field with a Kolmogorov power spectrum from large scales down to the gyration scale of energetic particles. We show that when the source regions of different species are offset by a distance comparable to the size of the source regions, the observed energetic particle composition He/H can be strongly variable over more than two orders of magnitude, even if the source ratio is at the nominal value. Assuming a 3He/4He source ratio of 10% in impulsive 3He-rich events and the same spatial offset of the source regions, the 3He/4He ratio at observation sites also vary considerably. The variability of the ion composition ratios depends on the radial distance, which can be tested by observations made at different radial locations. We discuss the implications of these results on the variability of ion composition of impulsive events and on further PSP and Solar Orbiter observations close to the Sun.

Solar Sources of Impulsive Solar Energetic Particle Events and Their Magnetic Field Connection to the Earth

2006 ◽  
Vol 650 (1) ◽  
pp. 438-450 ◽  
Author(s):  
Nariaki V. Nitta ◽  
Donald V. Reames ◽  
Marc L. DeRosa ◽  
Yang Liu ◽  
Seiji Yashiro ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Energetic Particle ◽  
Solar Energetic Particle ◽  
Solar Energetic Particle Events ◽  
The Earth
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