Search Publications
Relationship between three-dimensional velocity of filament eruptions and CME association
Ichimoto, Kiyoshi; Ishii, Takako T.; Asai, Ayumi +2 more
It is widely recognised that filament disappearances or eruptions are frequently associated with Coronal Mass Ejections (CMEs). Since CMEs are a major source of disturbances of the space environment surrounding the Earth, it is important to investigate these associations in detail for the better prediction of CME occurrence. However, the proportio…
MMX geodesy investigations: science requirements and observation strategy
Kouyama, Toru; Baresi, Nicola; Hirata, Naru +10 more
In order to investigate the origin of Phobos and Deimos, the Japanese Martian Moons eXploration (MMX) mission is scheduled for launch in 2024. MMX will make comprehensive remote-sensing measurements of both moons and return regolith samples from Phobos to Earth. Geodetic measurements of gravity, shape, and rotation parameter of a body provides con…
The Mie representation for Mercury's magnetic field
Glassmeier, K. -H.; Narita, Y.; Motschmann, U. +4 more
The parameterization of the magnetospheric field contribution, generated by currents flowing in the magnetosphere is of major importance for the analysis of Mercury's internal magnetic field. Using a combination of the Gauss and the Mie representation (toroidal–poloidal decomposition) for the parameterization of the magnetic field enables the anal…
MEGANE investigations of Phobos and the Small Body Mapping Tool
Chabot, Nancy L.; Ernst, Carolyn M.; Nair, Hari +4 more
The MEGANE instrument onboard the MMX mission will acquire gamma-ray and neutron spectroscopy data of Phobos to determine the elemental composition of the martian moon and provide key constraints on its origin. To produce accurate compositional results, the irregular shape of Phobos and its proximity to Mars must be taken into account during the a…
The spectral scalings of magnetic fluctuations upstream and downstream of the Venusian bow shock
Zhang, T. L.; Chen, Y. Q.; Wang, G. Q. +2 more
We statistically investigate the spectral scalings of magnetic fluctuations at the upstream and downstream regions near the Venusian bow shock and perform a differentiation by shock geometry. Based on the Venus Express data, 115 quasi-parallel (
Small-scale topographic irregularities on Phobos: image and numerical analyses for MMX mission
Michel, Patrick; Miyamoto, Hideaki; Takemura, Tomohiro +2 more
The mothership of the Martian Moons eXploration (MMX) will perform the first landing and sampling on the surface of Phobos. For the safe landing, the 2.1-m-wide mothership of the MMX should find a smooth surface with at most 40 cm topographic irregularity, however, whose abundance or even existence is not guaranteed based on current knowledge. We …
Unusual enhancement of 30 MeV proton flux in an ICME sheath region
Yashiro, Seiji; Nitta, Nariaki V.; Oka, Mitsuo +3 more
In gradual Solar Energetic Particle (SEP) events, shock waves driven by coronal mass ejections (CMEs) play a major role in accelerating particles, and the energetic particle flux enhances substantially when the shock front passes by the observer. Such enhancements are historically referred to as Energetic Storm Particle (ESP) events, but it remain…
Visibility analysis of Phobos to support a science and exploration platform
Sefton-Nash, Elliot; Cardesín-Moinelo, Alejandro; Witasse, Olivier +3 more
The surfaces of the Martian moons, Phobos and Deimos may offer a stable environment for long-term operation of platforms. We present a broad assessment of potential scientific investigations, as well as strategic and operational opportunities offered by long-term operation of an instrumented lander. Studies using observations of Mars' moons, and t…
The Mie representation for Mercury's magnetospheric currents
Glassmeier, K. -H.; Narita, Y.; Motschmann, U. +4 more
Poloidal–toroidal magnetic field decomposition is a useful application of the Mie representation and the decomposition method enables us to determine the current density observationally and unambiguously in the local region of magnetic field measurement. The application and the limits of the decomposition method are tested against the Mercury magn…
Comparison of terrestrial and Martian TEC at dawn and dusk during solstices
Witasse, Olivier; Sánchez-Cano, Beatriz; Burrell, Angeline G. +2 more
This paper used the similarities between the ionospheres on Mars and Earth, the most similar of the terrestrial planets, to examine the relative importance of photochemical and transport processes at dawn and dusk. The amount of plasma present in the ionosphere, as measured by the total electron content (TEC), was examined at different locations f…