A Conjunctive Study of Solar Flare 20010402 and Related Solar Proton Events by the Observation of SZ2/XD and ZY1/CBMC

Chen

Chinese J of Geophysics

et al. 2007

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The observations of the particle detector inside ‘ZY‐1' (CBERS‐1) satellite are compared with the radiation belt models (AE8/AP8). It is found that the measurements in SAA(Southern Atlantic Anomaly) are in accord with the predictions by the models, while the measured electron flux is much lower than the prediction by the AE8 model in the regions of southern and northern aurora belts. According to the observations of NOAA satellite, this difference is considered to be caused by the difference of the particle pitch angle distributions in SAA and the regions of the aurora belts. The particle's flux in SAA is inclined to be isotropic, while in the regions of the aurora belts it is obviously anisotropic where the particles distributed near 90° pitch angle are much larger than that distributed near 0° Pitch angle.

Section: Introductionmentioning

confidence: 99%

Comparison Between the Observation of the Particle Detector Inside ‘ZY‐1' Satellite and the Model of the Radiation Belt

Chen

Chinese J of Geophysics

et al. 2007

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“…The characters of the events near north aurora belt (events 4,8,13) are similar to the south aurora belt events, the peak of 0.5-2.0 MeV electron also appears in the range of L=3-4 but the value is one order of magnitude less. The events in South Atlantic area are different from those near aurora belts as shown in events 5,9,11.…”

Section: Time Series and Sub-track Of The Typical Eventsmentioning

confidence: 80%

“…The satellite is in a solar synchronous orbit with an inclination of 98° and an orbit period of 100.4 min and a height about 780 km from the surface. During the life time of the satellite, the particle detector worked well and obtained volumes of data, which have been used to compare with the data acquired from the X-ray detector onboard ShenZhou-2 spaceship [12,13] .…”

mentioning

confidence: 99%

Analysis of the observation of particle detector inside ‘CBERS-1’ satellite under solar quiet conditions

et al. 2006

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Based on the knowledge and related theory of earth's radiation belt, the data of energetic particles observed by detectors onboard 'CBERS-1' satellite at a solar synchronous orbit were analyzed. It is proved that the observational results are in agreement with the theoretical description of the radiation belt structures. Analysis of more than 3 years' data showed clearly that under quiet solar conditions, at a height of about 800 km the energetic particles were mainly located in three regions: northern auroral belt (40°-80°), southern auroral belt (−40°-−80°) and South Atlantic Geomagnetic Anomaly Region (SAA). Actually, this is for the global distribution, at each longitude the latitudinal coverage is much narrower and particles are along the geomagnetic latitude of about ±60°. The species of particles in different regions and their counting rates are different. In SAA, usually both electrons and protons are observed, which should come from inner radiation belt; in polar regions only energetic electrons are observed under the quiet condition, which belongs to the outer radiation belt. The distribution of outer radiation electrons is asymmetrical for longitudes as well as northern and southern polar regions. These asymmetries can be explained with the reflecting altitudes of the mirror points of charged particles at the same L shell.

“…During the solar flares, the fluxes of high energy particles in polar area at 780 km height are significantly enhanced. However, the enhanced fluxes are not proportional to the X-ray [6] . After the large magnetic storms, PRD can still observe the enhanced events of high energy electrons, which shows some recurrences by 27 days [7] .…”

Section: Introductionmentioning

confidence: 86%

Discussion on the geometric factor in the detection of high energy electrons in geospace

Chen

Shi

Sci. China Ser. E-Technol. Sci.

et al. 2008

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High energy electron is a kind of sources to be detected in the geospace environment. Generally, the particle telescope with much thick semiconductor detector is used as the sensor for energetic electrons because they can penetrate deeply into the detector. The more energy of the electrons is, the deeper they can penetrate into, so that the geometric factor varies with energy of the incident electrons. We discuss the geometric factor of particle radiation detector (PRD), which is a payload on ZY-1 (CBERS-1 and CBERS-2) satellites to monitor the high energy particle radiation inside the satellites. According to the NASA's AE8 model, the geometric factors of electrons for the low energy bin (0.5-1.0 MeV) and the high energy bin (> 2.0 MeV) are 2.468 and 1.736 cm 2 ·sr, respectively. These results are much different from the traditional calculation of the geometric factor that is 1.18 cm 2 ·sr. The angle-response function of the telescope is also derived, which can be useful for design of the telescope and analysis of the directional distribution. geometric factor, high energy electrons, particle radiation, space exploration