The Secular Variation of the Center of Geomagnetic South Atlantic Anomaly and Its Effect on the Distribution of Inner Radiation Belt Particles

Ye, Yuguang; Zou, Hong; Zong, Qiugang; Chen, Hongfei; Wang, Yongfu; Yu, Xiaomei; Shi, Wei

doi:10.1002/2017sw001687

Cited by 18 publications

(14 citation statements)

References 23 publications

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“…The trapped radiation environment, consisting of large amounts of energetic charged particles, can be potentially harmful to human beings and space vehicles immerged in it (Qin et al, 2014). This high radiation zone at a low altitude has potential threat to low orbit spacecrafts, such as weather-forecast satellites and manned missions (Ye et al, 2017).Although most of the effects of SAA have been studied for its external interactions with the upper atmosphere and magnetosphere, the https://doi.org/10.5194/npg-2020-15 Preprint. Discussion started: 18 May 2020 c Author(s) 2020.…”

Section: The South Atlantic Anomalymentioning

confidence: 99%

South Atlantic Anomalyduring ascending and maximum phase of solar cycle 24

Nasuddin

Abdullah

Hamid

2020

Preprint

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Abstract. For this research, four regions have been studied which are the South Atlantic Anomaly (SAA) region, low latitude region, middle latitude region and high latitude region. The active period which is the period when the geomagnetic storm occur chosen to be analyzed is on 6 August 2011 and 12 April 2014 and the normal period, a period when no geomagnetic storm happen is on 24 July 2011 and 14 May 2014. Year 2011 is chosen to be analyze in order to study the SAA region during the ascending phase of the solar cycle 24 and in year 2014, where the occurrence of the maximum phase of solar cycle 24 occur. The research is carried since there is no clear characterization of the SAA during ascending as well as maximum phase based on power spectrum analysis method. The Earth's magnetic field component chosen to be analyzed is the horizontal intensity (H) due to its sensitiveness regarding geomagnetic activeness. From the research conducted, the result reveal SAA region has a tendency to be persistent during both period compare to other region during both phases. Other regions in the research experience a tendency to be persistent and antipersistent.

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Section: The South Atlantic Anomalymentioning

confidence: 99%

South Atlantic Anomalyduring ascending and maximum phase of solar cycle 24

Nasuddin

Abdullah

Hamid

2020

Preprint

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“…This creates a region with reduced magnetic field intensity, namely the South Atlantic Anomaly (SAA), which is located approximately on the eastern coast of Brazil. The SAA is a place where the radiation of the inner van Allen belt approaches the closest to Earth [2,3]. One of the manifestations of the SAA is the enhanced count rate of protons and electrons coming from the inner radiation belt [4].…”

Section: Introductionmentioning

confidence: 99%

“…It has been observed that the SAA moves steadily in a northwest direction. This movement has been registered by measurement of the magnetic field [8,9] and by radiation [2,3,[10][11][12][13][14][15][16][17][18][19][20][21]. Table 1 summarizes the publications that have focused on examining the drift of the radiation center of the SAA.…”

Section: Introductionmentioning

confidence: 99%

“…As shown in previous studies, a large spread of drift velocities has been reported. Such large discrepancies could be explained by the dependence of the particle flux on the altitude and on particle energy, as described in [2], as many measurements were performed on different orbits with different instrumentation. Other phenomena that influence the drift of the SAA and its velocity are sun modulation and "geomagnetic jerks".…”

Section: Introductionmentioning

confidence: 99%

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CubeSat Observation of the Radiation Field of the South Atlantic Anomaly

Kovář

Sommer

2021

Remote Sensing

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The movement of the South Atlantic Anomaly has been observed since the end of the last century by many spacecrafts equipped with various types of radiation detectors. All satellites that have observed the drift of the South Atlantic Anomaly have been exclusively large missions with heavy payload equipment. With the recent rapid progression of CubeSats, it can be expected that the routine monitoring of the South Atlantic Anomaly will be taken over by CubeSats in the future. We present one-and-a-half years of observations of the South Atlantic Anomaly radiation field measured by a CubeSat in polar orbit with an elevation of 540 km. The position is calculated by an improved centroid method that takes into account the area of the grid. The dataset consists of eight campaigns measured at different times, each with a length of 22 orbits (~2000 min). The radiation data were combined with GPS position data. We detected westward movement at 0.33°/year and southward movement at 0.25°/year. The position of the fluence maximum featured higher scatter than the centroid position.

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“…The SAA of proton radiation belt drifts westward at a rate about 0.1–1.0°/year, following the drift of the geomagnetic‐field configuration, and drifts northward at a rate about 0.06–0.16°/year. The westward and northward drifting rates are related to the altitude of SAA (e.g., Badhwar, 1997; Bühler et al, 2002; Casadio & Arino, 2011; Fürst et al, 2009; Grigoryan et al, 2008; Heynderickx, 1996; Jones et al, 2017; Konradi et al, 1994; Qin et al, 2014; Schaefer et al, 2016; Ye et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Long‐Term Variations of >16‐MeV Proton Fluxes: Measurements From NOAA POES and EUMETSAT MetOp Satellites

Lin

Zhang²,

Zhang

et al. 2020

JGR Space Physics

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Based on the recalibrated data of >16-MeV proton omnidirectional integral fluxes obtained from NOAA POES and EUMETSAT MetOp satellites during the period from 1978 to 2014, solar cycle phase lags, the variations of proton radiation belt, and the relationships between trapped proton fluxes and F10.7 flux, cosmic ray, or sunspot number are investigated in detail. It is found that (a) the solar cycle phase lags between energetic proton fluxes and sunspot number are within 2.5 years, dependent on solar cycle, L m , B/B 0 , and proton energy; (b) at the magnetic equator, the ratios of the maximal to minimal values of 4-month smoothed monthly >16-MeV proton fluxes during the period from 1978 to 2014 increase and then decrease with increasing L m , showing the maximal value~11.24 at L m ¼ 1.15; and (c) at a magnetic field line with L m ≤ 1.15, the ratios of the maximal values in 1987 to the minimal values in 2002 for yearly >16-MeV proton fluxes decrease with increasing B/B 0 , while at a magnetic field line with L m ≥ 1.16, they increase and then decrease with increasing B/B 0 , and the maximal ratio for all magnetic field lines can reach above 20. An exponential equation with an offset is feasible to describe the relationship between the logarithm of >16-MeV proton fluxes and F10.7 flux. It can be readily used to improve the NOAAPRO model.

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The Secular Variation of the Center of Geomagnetic South Atlantic Anomaly and Its Effect on the Distribution of Inner Radiation Belt Particles

Cited by 18 publications

References 23 publications

South Atlantic Anomalyduring ascending and maximum phase of solar cycle 24

South Atlantic Anomalyduring ascending and maximum phase of solar cycle 24

CubeSat Observation of the Radiation Field of the South Atlantic Anomaly

Long‐Term Variations of >16‐MeV Proton Fluxes: Measurements From NOAA POES and EUMETSAT MetOp Satellites

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