Yuguang Ye

Peking University | PKU

The Van Allen Probes mission contributed to the discovery of the relativistic (∼500 keV–2 MeV) and ultra‐relativistic (∼>2 MeV) electron three‐belt structure in Earth's radiation belts. This structure results from the partial depletion of the preexisting outer belt and the replenishment of a new outer belt. Ultra‐low frequency and very‐low frequenc...

Electrons in Low Earth Orbit (LEO) have been a popular research topic since the early days of space exploration. However, due to the limited pitch angle coverage and energy resolution of past in‐situ measurements, there is still much to uncover about the radiation environment. Fortunately, the recently launched satellite FY3E, which is equipped wit...

The relativistic (~500 keV–2 MeV) and ultra-relativistic (~> 2 MeV) electron three-belt structure can originate from the partial depletion of the preexisting outer belt and replenishment of the new belt without direct electron injections. These processes may be related to radial diffusion caused by ULF (Ultra-Low Frequency) waves and local accelera...

The Medium-Energy Electron Detector (MEED), a space weather monitoring instrument on the Fengyun-3E (FY-3E) satellite, is introduced in this paper. The MEED utilizes pin-hole imaging technology on low-orbit satellites for medium-energy electron detection. Two orthogonal sensor heads enable the MEED to measure electrons from 18 directions simultaneo...

Energetic electron measurement is of great significance to theoretical space physics research and space weather applications. Current energetic electron detectors must cooperate with a spin-stabilized satellite platform to achieve high angular resolution in pitch angle distribution and three-dimensional (3D) imaging measurement of energetic electro...

The Van Allen radiation belts are an extraordinary science discovery in the Earth magnetosphere and consist of two electron belts. The inner Van Allen belt contains electrons of 10s to 100s keV; the outer belt consists mainly of 0.1−10 MeV electrons. Their dynamics have been analyzed for decades. The newly-launched Van Allen Probes provide unpreced...

Using the Martian ionospheric electron density data obtained by the LPW instrument onboard MAVEN spacecraft from Oct. 2014 to Oct. 2018, we analyzed the seasonal behaviors of the Martian nightside ionosphere. It is found that from Mars season Ls 0-180° to Mas season Ls 180-360°, 1) at 200-300 km, the nightside ionospheric electron densities uniform...

Using the Martian ionospheric electron density data obtained by the LPW instrument onboard MAVEN spacecraft from Oct. 2014 to Oct. 2018, we analyzed the seasonal behaviors of the Martian nightside ionosphere. It is found that from Mars season Ls 0–180° to Mas season Ls 180–360°, 1) at 200–300 km, the nightside ionospheric electron densities uniform...

Martian global dust storms have significant influences on its atmosphere and ionosphere. In this research, the behavior of O2+ ${\mathrm{O}}_{2}^{+}$, CO2+ ${\mathrm{C}\mathrm{O}}_{2}^{+}$, and O⁺ density profiles during the 2018 global dust storm is studied based on the observations of Neutral Gas and Ion Mass Spectrometer (NGIMS) onboard Mars Atm...

Energetic electron measurement is of great significance to theoretical space physics research and space weather applications. Current energetic electron detectors must cooperate with a spin-stabilized satellite platform to achieve high angular resolution in pitch angle distribution and three-dimensional imaging measurement of energetic electrons. T...

The internal charging effect may lead to electrostatic discharges (ESD) for GEO and MEO satellites. This is due to the high-energy electrons that deposit in the dielectrics of satellites. The properties of the dielectrics such as permittivity and dark conductivity dominate this effect. This may contribute to the ESD risk of long-lifetime satellites...

With the help of the high-spatial-resolution Total Electron Content (TEC) data obtained by Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) on board the Mars Express (MEx) during Jun. 2005 – Sept. 2007, the detailed configurations of the Martian nightside ionosphere in crustal magnetic field cusp regions are researched in this p...

The Deep Dielectric Charging Effect Monitor (DDCEM) has been designed to study the internal charging effect by measuring the charging currents and potentials inside the spacecraft. It is equipped on three Chinese navigation satellites in a circular Medium Earth Orbit (MEO) with 22000km average height and 55° inclinations. Numerical simulation based...

Energetic electron measurements and spacecraft charging are of great significance for theoretical research in space physics and space weather applications. In this paper, the energetic electron detection package (EEDP) deployed on three Chinese navigation satellites in medium Earth orbit (MEO) is reviewed. The instrument was developed by the space...

Profiles of the Martian dayside ionosphere can be used to derive the neutral atmospheric densities at 130 km, which can also be obtained from the Mars Climate Database (MCD) and spacecraft aerobraking observations. In this research, we explain the method used to calculate neutral densities at 130 km via ionosphere observations and three long-period...

The flux variations of energetic electrons is one of the most important topics to understand dynamic processes in the space environment and the forecast for high‐energy electron burst. BeiDa Image Electron Spectrometer (BD‐IES), an imaging energetic elecstron spectrometer onboard a Chinese navigation satellite at an inclined geosynchronous orbit, c...

The effects of a local dust storm on the upper atmosphere of Mars are researched through the observations of the lower and upper Martian atmosphere in the MGS (Mars Global Surveyor) radio occultation experiments. The ionosphere profiles in the high‐latitude region of northern hemisphere are thought to be under the influence of a local dust storm oc...

15 An Imaging energetic Electron Spectrometer built by the Peking University team (BD-IES) 16 onboard a Chinese navigation satellite in an inclined GEO orbit has been launched successfully in 17 September 2015, which measures the spectra of the energetic electrons with the energy range of 18 50~600 keV in nine directions. In this study, Monte Carlo...

The energetic electron measurement is one of the most important issues to understand dynamics in space physics and the applications for space weather. In this study, the principle and functional components of the Imaging energetic Electron Spectrometer (IES) onboard a Chinese navigation satellite in the inclined GEO orbit (IGSO) was introduced. The...

In this study, we carry out a comprehensive analysis of secular variation of the South Atlantic Anomaly. The center location of the SAA are derived from the proton flux measurements of different energy channels by SAMPEX/PET. The results are compared with NOAA/MEPED observations and the IGRF12 geomagnetic field model. It is found that different ene...

A method to estimate the neutral atmospheric density near the ionospheric main peak of Mars is introduced in this study. The neutral densities at 130 km can be derived from the ionospheric and atmospheric measurements of the Radio Science experiment onboard Mars Global Surveyor (MGS). The derived neutral densities cover a large longitude range in n...