Seasonal Variation and Geomagnetic Storm Index Effects on the Proton Flux Response in the South Atlantic Anomaly by Test Particle Simulations

2021 ◽  
Author(s):  
Kirolosse Girgis ◽  
Tohru Hada ◽  
Shuichi Matsukiyo
Keyword(s):  
Seasonal Variation ◽  
Geomagnetic Storm ◽  
Test Particle ◽  
South Atlantic ◽  
Proton Flux ◽  
The South ◽  
South Atlantic Anomaly ◽  
Particle Simulations ◽  
Flux Response ◽  
Storm Index

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.

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

scholarly journals Characterization of the South Atlantic Anomaly

2018 ◽  
Author(s):  
Khairul Afifi Nasuddin ◽  
Mardina Abdullah ◽  
Nurul Shazana Abdul Hamid
Keyword(s):  
Magnetic Field ◽  
Geomagnetic Storm ◽  
South Atlantic ◽  
Active Period ◽  
The South ◽  
South Atlantic Anomaly ◽  
The Earth ◽  
Normal Period ◽  
Earth Magnetic Field ◽  
Latitude Region

Abstract. This research intends to characterize the South Atlantic Anomaly (SAA) by applying power spectrum analysis approach. From the approach, the Hurst exponent can be determined. The motivation to study the SAA region is due to its nature. A comparison was made between the stations in the SAA region and outside the SAA region during the geomagnetic storm occurrence (active period) and normal period where no geomagnetic storm occurred. The data for the occurrence of the active period was taken on 11 March 2011 while for normal period on 3 February 2011. The outcomes of the research revealed that the SAA region had a tendency to be persistent during active period and normal periods. It can be said, it experiences this characteristic because of the Earth’s magnetic field strength. Through the research, it is found that as the Earth magnetic field increases, it is likely to show an antipersistent value. This is found in the high latitude region. The lower the Earth magnetic field, the more it shows the persistent value as in the middle latitude region. In the region where the Earth magnetic field is very low like the SAA region it shows a tendency to be persistent.

scholarly journals Characterization of the South Atlantic Anomaly

2019 ◽  
Vol 26 (1) ◽  
pp. 25-35
Author(s):  
Khairul Afifi Nasuddin ◽  
Mardina Abdullah ◽  
Nurul Shazana Abdul Hamid
Keyword(s):  
Magnetic Field ◽  
Geomagnetic Storm ◽  
South Atlantic ◽  
Active Period ◽  
The South ◽  
Earth’S Magnetic Field ◽  
South Atlantic Anomaly ◽  
Normal Period ◽  
Earth's Magnetic Field ◽  
Latitude Region

Abstract. This research intends to characterize the South Atlantic Anomaly (SAA) by applying the power spectrum analysis approach. The motivation to study the SAA region is due to its nature. A comparison was made between the stations in the SAA region and outside the SAA region during the geomagnetic storm occurrence (active period) and the normal period where no geomagnetic storm occurred. The horizontal component of the data of the Earth's magnetic field for the occurrence of the active period was taken on 11 March 2011 while for the normal period it was taken on 3 February 2011. The data sample rate used is 1 min. The outcome of the research revealed that the SAA region had a tendency to be persistent during both periods. It can be said that the region experiences these characteristics because of the Earth's magnetic field strength. Through the research, it is found that as the Earth's magnetic field increases, it is likely to show an antipersistent value. This is found in the high-latitude region. The lower the Earth's magnetic field, the more it shows the persistent value as in the middle latitude region. In the region where the Earth's magnetic field is very low like the SAA region it shows a tendency to be persistent.

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

Geomagnetic storm-time variations in the South Atlantic Anomaly Region

2005 ◽  
Author(s):  
Nalin B. Trivedi Convênio ◽  
Santa Maria ◽  
Rajaram P. Kane ◽  
Severino L. G. Dutra ◽  
São José dos Campos ◽  
...  
Keyword(s):  
Geomagnetic Storm ◽  
South Atlantic ◽  
The South ◽  
South Atlantic Anomaly ◽  
Time Variations ◽  
Anomaly Region

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
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