Search Publications
Influence of Martian crustal magnetic anomalies on the emission of energetic neutral hydrogen atoms
Barabash, S.; Futaana, Y.; Grigoriev, A. +2 more
We analyze the data on hydrogen energetic neutral atoms (ENAs) emissions from the dayside of Mars, recorded by a Neutral Particle Detector of the Analyzer of Space Plasmas and Energetic Atoms aboard Mars Express from 14 March to 9 July 2004. We first identify and analyze events of the ENA flux enhancement coinciding with the presence of the crusta…
Statistical analysis of electron lifetimes at GEO: Comparisons with chorus-driven losses
Balikhin, M. A.; Mourenas, D.; Boynton, R. J.
The population of electrons in the Earth's outer radiation belt increases when the magnetosphere is exposed to high-speed streams of solar wind, coronal mass ejections, magnetic clouds, or other disturbances. After this increase, the number of electrons decays back to approximately the initial population. This study statistically analyzes the life…
Mars Express radio-occultation data: A novel analysis approach
Witasse, O.; Blelly, P. -L.; Grandin, M. +1 more
The Mars Express Radio Science (MaRS) experiment on board Mars Express has been providing radio-occultation data since early 2004. The analysis method currently used to retrieve neutral atmosphere and ionosphere profiles is based on the resolution of a complex inverse problem. The solution to such a problem is obtained under strong assumptions on …
Variability of Titan's induced magnetotail: Cassini magnetometer observations
Dougherty, Michele K.; Simon, Sven; Neubauer, Fritz M. +1 more
We study the structure and variability of Titan's magnetotail by analyzing Cassini magnetic field observations from all tail crossings between 2005 and 2013. Titan's magnetotail is strongly affected by fluctuations in the ambient magnetospheric field conditions. Therefore, even Titan flybys with nearly identical trajectories may reveal a completel…
Forecast of solar proton flux profiles for well-connected events
Moon, Yong-Jae; Ji, Eun-Young; Park, Jinhye
We have developed a forecast model of solar proton flux profiles (> 10 MeV channel) for well-connected events. Among 136 solar proton events (SPEs) from 1986 to 2006, we select 49 well-connected ones that are all associated with single X-ray flares stronger than M1 class and start to increase within 4 h after their X-ray peak times. These event…
A refined classification of SPEs based on the multienergy channel observations
Cho, K. -S.; Kim, R. -S.; Park, Y. -D. +2 more
We have investigated characteristics of solar proton events (SPEs) and their association with other types of solar eruption using 42 SPEs observed with SOlar and Heliospheric Observatory/Energetic and Relativistic Nuclei and Electron detector from 1997 to 2012. A velocity dispersion analysis was performed to correctly estimate the onset times of p…
An unusual long-lived relativistic electron enhancement event excited by sequential CMEs
Yang, Xiao C.; Zhu, Guang W.; Zhang, Xiao X. +3 more
An unusual long-lived intense relativistic electron enhancement event from July to August 2004 is examined using data from Fengyun-1, POES, GOES, ACE, the Cluster Mission, and geomagnetic indices. During the initial 6 days of this event, the observed fluxes in the outer zone enhanced continuously, and their maximum increased from 2.1 × 102
Rotational/compressional nature of the magnetopause: Application of the BV technique on a magnetopause case study
Dorville, Nicolas; Belmont, Gérard; Rezeau, Laurence +2 more
The magnetopause boundary implies two main kinds of variations: a density/temperature gradient and a magnetic field rotation. Other variations are associated with these two, concerning in particular the flow velocity, the electric field, and the plasma composition. Compressional and rotational variations are always observed in a close vicinity of …
In situ observations of density cavities extending above the auroral acceleration region
Karlsson, T.; Marklund, G. T.; Alm, L.
The uppermost part of a stable potential structure in the auroral acceleration region was studied using simultaneous observations of Cluster satellites C1 and C3. Both satellites observe a monotonically decreasing electron density as they ascend through the auroral acceleration region. As C1 exits the top of the auroral acceleration region, the el…
Comparison of interplanetary CME arrival times and solar wind parameters based on the WSA-ENLIL model with three cone types and observations
Moon, Y. -J.; Jang, Soojeong; Na, Hyeonock +1 more
We have made a comparison between coronal mass ejection (CME)-associated shock propagations based on the Wang-Sheeley-Arge (WSA)-ENLIL model using three cone types and in situ observations. For this we use 28 full-halo CMEs, whose cone parameters are determined and their corresponding interplanetary shocks were observed at the Earth, from 2001 to …