Space radiation environment forecast for EGYPTSAT‐2 satellite

Samwel, Susan W.; Hady, Ahmed A.

doi:10.1029/2009sw000482

Cited by 6 publications

(7 citation statements)

References 14 publications

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“…We selected the same orbit parameters of EGYPTSAT‐2 as used by Samwel and Hady (2009). The orbit inclination was 98°(=PLEO mission) and the altitude was approximately 650 km.…”

Section: Resultsmentioning

confidence: 99%

“…This work is considered a complementary design phase of the previous efforts of Samwel and Hady (2009) for predicting the radiation environment of EGYPTSAT-2. We present this valuable work to evaluate the particle and radiation environments of the upcoming space missions more accurately.…”

Section: Motivation and Objectivementioning

confidence: 99%

“…One of the future research directions suggested by Samwel and Hady (2009) was the assessment of the SEU rates for the previous EGYPTSAT‐2 mission. We are delighted to accomplish this complementary work in a response of the Egyptian space program needs through presenting an adequate radiation analysis of the forthcoming space missions.…”

Section: Conclusion and Summarymentioning

confidence: 99%

“…We present here as a case study the remote sensing satellite EGYPTSAT-2: Samwel and Hady (2009) adequately carried out the radiation analysis of the mission by combining several semi-empirical models where one of them was the AP8 trapped model. Unfortunately, one year after its launch date (16 April 2014), the satellite was out of control, and the 11-year planned mission terminated unsuccessfully (https://directory.eoportal.org/web/eoportal/ satellite-missions/e/egyptsat-2#overview).…”

Section: The Possible Cause Of the Loss Of Egyptsat-2mentioning

confidence: 99%

“…On the other hand, a higher‐inclined orbit spacecraft would experience more risks during an intense magnetic storm than a strong one. The additional accumulated absorbed radiation doses and the excess SEU rates can reach 17% and 19%, respectively, relative to quiet conditions. The previous results may formulate the reason of the failure of EGYPTSAT‐2: The short‐term activities occurring in the inner radiation belt and at the high latitudes were not included in the radiation analysis performed by Samwel and Hady (2009) who implemented the long‐term averaged AP8 model. We showed that before the satellite was out of control, the solar activity was very intense, leading to the occurrence of a SEP event and several geomagnetic storms, hence creating convenient conditions for the solar protons to reach abundantly the high latitudinal regions and imposing excessive radiation risks on the satellite.…”

Section: Conclusion and Summarymentioning

confidence: 99%

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Geomagnetic Storm Effects on the LEO Proton Flux During Solar Energetic Particle Events

Girgis,

Hada,

Yoshikawa

et al. 2023

Space Weather

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During a few solar energetic particle (SEP) events, solar protons were trapped within the geomagnetic field and reached the outer edge of the inner radiation belt. We reproduced this phenomenon by modeling the proton flux distribution at the Low‐Earth Orbit (LEO) for different geomagnetic conditions during solar particle events. We developed a three‐dimensional relativistic test particle simulation code to compute the 70–180 MeV solar proton Lorentz trajectories in low L‐shell range from 1 to 3. The Tsyganenko model (T01) generated the background static magnetic field with the IGRF (v12) model. We have selected three Dst index values: −7, −150, and −210 nT, to define quiet time, strong, and severe geomagnetic storms and to generate the corresponding inner magnetic field configurations. Our results showed that the simulated solar proton flux was more enhanced in the high‐latitude regions and more expanded toward the lower latitude range as long as the geomagnetic storm was intensified. Satellite observations and geomagnetic cutoff rigidities confirmed the numerical results. Furthermore, the LEO proton flux distribution was deformed, so the structure of the proton flux inside the South Atlantic Anomaly (SAA) became longitudinally extended as the Dst index decreased. Moreover, we have assessed the corresponding radiation environment of the LEO mission. We realized that, for a higher inclined LEO mission during an intense geomagnetic storm (Dst = −210 nT), the probability of the occurrence of the Single Event Upset (SEU) rates increased by 19% and the estimated accumulated absorbed radiation doses increased by 17% in comparison with quiet conditions.

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“…We selected the same orbit parameters of EGYPTSAT‐2 as used by Samwel and Hady (2009). The orbit inclination was 98°(=PLEO mission) and the altitude was approximately 650 km.…”

Section: Resultsmentioning

confidence: 99%

Section: Motivation and Objectivementioning

confidence: 99%

Section: Conclusion and Summarymentioning

confidence: 99%

Section: The Possible Cause Of the Loss Of Egyptsat-2mentioning

confidence: 99%

Section: Conclusion and Summarymentioning

confidence: 99%

See 3 more Smart Citations

Geomagnetic Storm Effects on the LEO Proton Flux During Solar Energetic Particle Events

Girgis,

Hada,

Yoshikawa

et al. 2023

Space Weather

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Possible connection between solar activity and local seismicity

Takla

Samwel

2023

Terr Atmos Ocean Sci

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Recently, much attention has been paid to the relationship between solar and seismic activities toward earthquake (EQ) prediction. Some researchers believe in the existence of a connection between them; however, others completely refuse the existence of such a connection. In this study, the correlation between solar disturbances and occurrence of EQs during two consecutive solar cycles (SCs) 23 & 24 from 1996 to 2019 was investigated to explore such a relationship. The study was performed on both global and local scales. On a global scale, we studied the temporal variations of EQs number and the corresponding solar activity, represented by sunspot number. On the other hand, we selected several seismic zones characterized with high seismic activities and shallow depth EQs. For each zone we examined the day-to-day variations in the number of EQs and explored the space weather “chain of action” from the Sun to Earth in order to examine whether these events have an influence to increase the number of EQs or not. Results showed that, for the whole global seismicity, no clear correlation is found between EQs occurrence and solar activity, while for small active seismic zones, the connection between them is significant. An increase in the number of shallow EQs in the studied seismic zones is observed in association with the variations of examined space weather indices. Thus, the current study suggests a possible connection between solar activity and localized seismic activities. However, the solar-magnetosphere-lithosphere coupling and interaction during solar events need further study and investigation for a better understanding of their EQ triggering effects.

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