Day 2 :
Keynote Forum
Jianguo Huang
Beijing Institute of Spacecraft Environmental Engineering, China
Keynote: Spacecraft charging in low earth orbit plasma driven by high voltage solar arrays in low earth orbit plasma
Time : 10:00-10:45
Biography:
Jianguo Huang has completed his PhD from Institute of Physics, Chinese Academy of Sciences. He is the Senior Expert of Spacecraft Environment Engineering, member of expert database of Ministry of Science and Technology, China and referee expert of China Natural Fund Committee. He mainly specializes in space environment and its interaction with spacecraft. He has published more than 70 papers in reputed journals and has been serving as an Editorial Board Member of several academic journals.
Abstract:
Space vehicles immersed in space plasma are generally charged to certain potentials, which usually depend on the local plasma temperature and exposed material properties. Generally speaking, the spacecraft running in low earth orbit will experience weak surface charging due to the fact that the low earth orbit pass through the ionosphere, which is composed of dense and cold plasma with typical electron temperature of 0.2 eV. However, application of high voltage solar arrays can induce significant spacecraft charging in some situations, two typical charging events, rapid charging and normal charging, have been observed on international space station, both of which are induced by the interaction of high voltage solar arrays with space plasma and occur at exit from eclipse. For the rapid charging, with typical spikes of floating potential up to 70 volts have been observed frequently in the international space station. Such a charging situation is threatening to the safety of the space station. In this paper, the spacecraft charging driven by high voltage solar arrays is modeled. The results show that the rapid and normal charging are two different stages of the same charging process. The rapid charging, the initial stage, is a non-equilibrium charging driven by the sudden solar panel voltage switch-on at eclipse exit, in which case the charging of the cover glasses by the ambient plasma can’t respond quickly enough to block the electron collection by the solar arrays effectively. As the charging reaches equilibrium, it displays as a normal charging event with smaller floating potential. The characteristics and trends of both the rapid and normal charging are presented by calculation with international space station configurations and the results agree well with observations.
Keynote Forum
Qiu-he Peng
Nanjing University, China
Keynote: The evidence of magnetic monopoles by astronomical observation and its astrophysical implication
Time : 10:45-11:30
Biography:
Jianguo Huang has completed his PhD from Institute of Physics, Chinese Academy of Sciences. He is the Senior Expert of Spacecraft Environment Engineering, member of expert database of Ministry of Science and Technology, China and referee expert of China Natural Fund Committee. He mainly specializes in space environment and its interaction with spacecraft. He has published more than 70 papers in reputed journals and has been serving as an Editorial Board Member of several academic journals.
Abstract:
A key observation has been reported in 2013: An abnormally strong radial magnetic field near the GC is discovered. Firstly, we demonstrate that the radiations observed from the GC are hardly emitted by the gas of accretion disk which is prevented from approaching to the GC by the abnormally strong radial magnetic field and these radiations can't be emitted by the black hole model at the Center. However, the dilemma of the black hole model at the GC be naturally solved in our model of super massive object with Magnetic Monopoles (MMs). Three predictions in our model are quantitatively in agreement with observations: It could be an astronomical observational evidence of the existence of MMs and no black hole is at the GC. Besides, making use of both the estimations for the space flux of MMs and nucleon decay catalyzed by MMs (called the RC effect) to obtain the luminosity of celestial objects by the RC effect. In terms of the formula for this RC luminosity we are able to present a unified treatment for various kinds of core collapsed supernovae , SNII, SNIb, SNIc, SLSN ( Super Luminous Supernova ) and the production mechanism for γ ray burst. The remnant of the supernova explosion is a neutron star rather than a black hole, regardless of the mass of the progenitor of the supernova. Besides, the heat source of the Earth’s core as well as the energy source needed for the white dwarf interior is the same mechanism of the energy source as supernova. This unified model can also be used to reasonably explain the possible association of the shot γ ray burst detected by the Fermi γ ray Burst Monitoring Satellite (GBM) with the September 2015 LIGO gravitational wave event GW150914. We propose that the physical mechanism of Hot Big Bang of the Universe is also nucleons decay driven by the magnetic monopoles, similar to the supernova explosion.