Search Publications
Earth atmospheric loss through the plasma mantle and its dependence on solar wind parameters
Nilsson, Hans; Dandouras, Iannis; Slapak, Rikard +3 more
Atmospheric loss and ion outflow play an important role in the magnetospheric dynamics and in the evolution of the atmosphere on geological timescales—an evolution which is also dependent on the solar activity. In this paper, we investigate the total
An uppermost haze layer above 100 km found over Venus by the SOIR instrument onboard Venus Express
Vandaele, Ann Carine; Robert, Séverine; Mahieux, Arnaud +3 more
The Solar Occultation in the InfraRed (SOIR) instrument onboard Venus Express was designed to measure the Venusian atmospheric transmission at high altitudes (65–220 km) in the infrared range (2.2–4.3 µm) with a high spectral resolution. In this work, we investigate the optical properties of Venus's haze layer above 90 km using SOIR solar oc…
Mean winds at the cloud top of Venus obtained from two-wavelength UV imaging by Akatsuki
Imamura, Takeshi; Takagi, Masahiro; Yamazaki, Atsushi +9 more
Venus is covered with thick clouds. Ultraviolet (UV) images at 0.3–0.4 microns show detailed cloud features at the cloud-top level at about 70 km, which are created by an unknown UV-absorbing substance. Images acquired in this wavelength range have traditionally been used to measure winds at the cloud top. In this study, we report low-latitude win…
Initial products of Akatsuki 1-µm camera
Imamura, Takeshi; Ando, Hiroki; Ueno, Munetaka +25 more
The status and initial products of the 1-µm camera onboard the Akatsuki mission to Venus are presented. After the successful retrial of Venus' orbit insertion on Dec. 2015 (5 years after the failure in Dec. 2010), and after a long cruise under intense radiation, damage in the detector seems small and fortunately insignificant in the final qu…
Theory, modeling, and integrated studies in the Arase (ERG) project
Miyoshi, Yoshizumi; Saito, Shinji; Seki, Kanako +17 more
Understanding of underlying mechanisms of drastic variations of the near-Earth space (geospace) is one of the current focuses of the magnetospheric physics. The science target of the geospace research project Exploration of energization and Radiation in Geospace (ERG) is to understand the geospace variations with a focus on the relativistic electr…
Density response to magnetic field fluctuation in the foreshock plasma
Narita, Yasuhito; Hada, Tohru
The foreshock plasma exhibits large-amplitude disturbance in the plasma density and the magnetic field. The question of the density response to the magnetic field fluctuation is addressed and studied observationally and statistically using the in situ Cluster spacecraft data of the foreshock plasma. Three major findings are obtained. First, the de…
Erratum: Correction to: Grad-Shafranov reconstruction of magnetohydrostatic equilibria with nonisotropic plasma pressure: the theory
Teh, Wai-Leong
After publication of this article (Teh 2018), the author has noticed some error with the statement in the abstract and discussion sections.
Near-Earth plasma sheet boundary dynamics during substorm dipolarization
Strangeway, Robert J.; Plaschke, Ferdinand; Russell, Christopher T. +29 more
We report on the large-scale evolution of dipolarization in the near-Earth plasma sheet during an intense (AL ~ ‑1000 nT) substorm on August 10, 2016, when multiple spacecraft at radial distances between 4 and 15 RE were present in the night-side magnetosphere. This global dipolarization consisted of multiple short-timescale (a couple o…
Spectral moments for the analysis of frequency shift, broadening, and wavevector anisotropy in a turbulent flow
Narita, Y.
Turbulence represents essentially random fluctuations that evolve both spatially and temporally, and appear in various geophysical and space science applications. A spectral moment method is proposed to characterize the turbulence energy spectra in the wavevector and frequency domain in the lowest-order sense. The frequency shift velocity and the …
An analysis of the 2016 Hitomi breakup event
Flegel, Sven; Bennett, James; Lachut, Michael +2 more
The breakup of Hitomi (ASTRO-H) on 26 March 2016 is analysed. Debris from the fragmentation is used to estimate the time of the event by propagating backwards and estimating the close approach with the parent object. Based on this method, the breakup event is predicted to have occurred at approximately 01:42 UTC on 26 March 2016. The Gaussian vari…