scholarly journals The South Atlantic Anomaly drift on the proton flux data of satellite experiments

2016 ◽  
Author(s):  
Sergey Aleksandrin ◽  
Sergey Koldashov ◽  
A. M. Galper ◽  
Temir Zharaspayev
Keyword(s):  
South Atlantic ◽  
Proton Flux ◽  
The South ◽  
South Atlantic Anomaly ◽  
Flux Data

Space Weather Effects on Proton Flux Variations in the South Atlantic Anomaly: A Numerical Study performed by Test Particle Simulations

2020 ◽  
Author(s):  
Kirolosse Girgis ◽  
Tohru Hada ◽  
Shuichi Matsukiyo
Keyword(s):  
Geomagnetic Storm ◽  
Space Weather ◽  
Test Particle ◽  
Three Dimensional ◽  
South Atlantic ◽  
Proton Flux ◽  
Storm Event ◽  
Time Varying ◽  
The South ◽  
South Atlantic Anomaly

<p>In this study, we assess the hourly variations of the three-dimensional proton flux distribution inside the South Atlantic Anomaly (SAA) during a geomagnetic storm. We have developed a relativistic three-dimensional guiding center test particle simulation code in order to compute the proton trajectories in a time-varying magnetic field background provided by Tsyganenko model TS05 and the corresponding time-varying inductive electric field. The Dst index is the main input parameter to the simulation model, while the maximum proton flux, the area of the SAA calculated below a selected threshold, and the penetration depth of the protons are the main output variables investigated in this study were. Since the LEO spacecraft and human-related activities are already affected by space weather conditions, the South Atlantic Anomaly (SAA) is also believed to create an additional source of risk. As the radiation environment depends essentially on the particle flux, the objective of this study is to estimate quantitatively the proton flux variations inside the South Atlantic Anomaly (SAA) in quiet and in storm conditions. So far, it was found that after several drift periods, the protons in the South Atlantic Anomaly (SAA) could penetrate to lower altitudes during geomagnetic storm event, and that, the SAA maximum flux value and the corresponding area, varied differently with respect to altitudes. Numerical results were compared with observations by NOAA 17 and RD3R2 instrument mounted on International Space Station (ISS).</p>

scholarly journals Inner Radiation Belt Simulations of the Proton Flux Response in the South Atlantic Anomaly during the Geomagnetic Storm of 15 May 2005

2021 ◽  
Author(s):  
Kirolosse Mina Georges Zaki Girgis ◽  
Tohru Hada ◽  
Shuichi Matsukiyo ◽  
Akimasa Yoshikawa
Keyword(s):  
Geomagnetic Storm ◽  
Weather Conditions ◽  
South Atlantic ◽  
Low Earth Orbit ◽  
Proton Flux ◽  
Particle Simulation ◽  
The South ◽  
Simulation Code ◽  
South Atlantic Anomaly ◽  
Flux Response

A test particle simulation code was developed to simulate the inner proton belt response during the intense geomagnetic storm of May 15, 2005. The guiding center model was implemented in order to compute the proton trajectories with energy range 70-180 MeV. The time-varying magnetic field model implemented in the simulations was computed by the Tsyganenko model TS05 with the associated inductive electric field. One of the most important features of the Low-Earth Orbit (LEO) environment is the presence of the South Atlantic Anomaly, which imposes a dangerous radiation load on most of the LEO missions. The objective of this research is to investigate the proton flux variations in the anomaly region with respect to space weather conditions. The results showed that during the main phase of the geomagnetic storm, the proton flux in the SAA was decreased, whereas throughout the initial and recovery phases, the proton flux was increased at most of the altitudes. Numerical results were confirmed by satellite measurements.

Relating the South Atlantic Anomaly and geomagnetic flux patches

2017 ◽  
Vol 266 ◽  
pp. 39-53 ◽  
Author(s):  
Filipe Terra-Nova ◽  
Hagay Amit ◽  
Gelvam A. Hartmann ◽  
Ricardo I.F. Trindade ◽  
Katia J. Pinheiro
Keyword(s):  
South Atlantic ◽  
The South ◽  
South Atlantic Anomaly

Neutron spectra measurements in the south Atlantic anomaly region

2010 ◽  
Vol 45 (10) ◽  
pp. 1526-1528 ◽  
Author(s):  
C.A. Federico ◽  
O.L. Gonçalez ◽  
E.S. Fonseca ◽  
I.M. Martin ◽  
L.V.E. Caldas
Keyword(s):  
South Atlantic ◽  
The South ◽  
South Atlantic Anomaly ◽  
Neutron Spectra ◽  
Anomaly Region

scholarly journals Ascension and Port Stanley geomagnetic observatories and monitoring the South Atlantic Anomaly

2010 ◽  
Vol 52 (1) ◽  
Author(s):  
Susan Macmillan ◽  
Chris Turbitt ◽  
Alan Thomson
Keyword(s):  
South Atlantic ◽  
The South ◽  
South Atlantic Anomaly

scholarly journals Geomagnetic storm-time variations in the South Atlantic Anomaly Region

2005 ◽  
Author(s):  
Nalin B. Trivedi ◽  
Rajaram P. Kane ◽  
Severino L. G. Dutra ◽  
Nelson J. Schuch
Keyword(s):  
Geomagnetic Storm ◽  
South Atlantic ◽  
The South ◽  
South Atlantic Anomaly ◽  
Time Variations ◽  
Anomaly Region
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