Subjects: Geosciences >> Space Physics submitted time 2017-01-22
Abstract: The Neutral Atom Image System with High energetic particles (NAIS-H) developed for a Chinese mission of Magnetosphere Ionosphere and Thermosphere (MIT) capable to obtain the global map of the plasma distribution with a high temporal-spatial resolution in support this mission. The calibration of detector was an important technical task in the development, which is the fundamental basis of data analysis and inversions.
Peer Review Status:Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2017-01-22
Abstract: Long term high energy electron irradiation may affect performance of the Si-PIN semiconductor detector (SSD).In order to assess the life of the detector in space radiation environment, electron irradiation source was used to simulate space electron environment, and the irradiation experiments were carried out on the semiconductor detector. Experiment results show that under the radiation dose of 7.64×1014, the SSD’s energy response capability had not changed, and the counting efficiency slightly decreased. As the radiation dose increased, the leakage current of the SSD increased, but the noise was relatively stable, and the performance of the detector did not affect the work index of the load.
Peer Review Status:Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2016-05-13
Abstract: By utilizing data obtained on Chinese satellite in the middle Earth orbit from solar activity descending phase to solar activity ascending phase, the properties of high energy electron environment in the middle Earth orbit are analyzed, such as spatial distribution, flux intensity, temporal variations, and response to geomagnetic storms. The investigating results indicate that the spatial distribution of high energy electron in the middle Earth orbit is stable;the fluxes of electrons decrease with energy increasing;the high energy electron environment is a dynamical system which disturbs evidently on different timescales;the evolvement of this system is stimulated by geomagnetic storms, but the correlation between the evolvement and the storms is nonlinear.
Peer Review Status:Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2016-05-13
Abstract: FY-3A satellite can measure the radiation dose data from different directions during the missions from 2008 to 2012. In this paper, we describe total radiation dose from two directions, and dose rate variation with energetic particle flux. The result shows that different sections of the spacecraft receive different amounts of radiation dose, which is always consistent with space distribution of energetic particles. Absorbed dose rate changed greatly from several rad (Si).d~(-1) during quite time to even more than tenfold during disturbances. The increased high energy electrons in polar regions during disturbances are responsible for significant increase of radiation dose. At last, FY-3A radiation dose during the operational period of the mission is compared with the results calculated by SPENVIS. It is obvious that observation data is more realistic to reflect the real space radiation environment.
Peer Review Status:Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2016-04-22
Abstract: This paper introduces the structure and working principle of the Neutral Atom Imaging System-High (NAIS-H) which is in the MIT project. Based on the testing needs of the instrument, we have designed ground test equipment, including the circuit system and the host computer system. In this paper, we show the structure and working principle of the ground test for NAIS-H, and tell structure and java programming of the sub modules of the host computer system in detail, such as API communicating system, data analyzing system and data saving system. At last, we test the equipment, and the result shows the ground test system has good performance and achieves the design requirement.
Peer Review Status:Awaiting Review