Search Publications
Spectral evolution of an eruptive polar crown prominence with IRIS observations
Li, Hui; Su, Yang; Xue, Jianchao
Prominence eruption is closely related to coronal mass ejections and is an important topic in solar physics. Spectroscopic observation is an effective way to explore the plasma properties, but the spectral observations of eruptive prominences are rare. In this paper we will introduce an eruptive polar crown prominence with spectral observations fr…
The dust-to-gas ratio, size distribution, and dust fall-back fraction of comet 67P/Churyumov-Gerasimenko: Inferences from linking the optical and dynamical properties of the inner comae.
Thomas, Nicolas; Marschall, Raphael; Wu, Jong-Shinn +3 more
In this work, we present results that simultaneously constrain the dust size distribution, dust-to-gas ratio, fraction of dust re-deposition, and total mass production rates for comet 67P/Churyumov-Gerasimenko. We use a 3D Direct Simulation Monte Carlo (DSMC) gas dynamics code to simulate the inner gas coma of the comet for the duration of the Ros…
AME: A Cross-scale Constellation of CubeSats to Explore Magnetic Reconnection in the Solar-Terrestrial Relation
Dunlop, Malcolm; Khotyaintsev, Yuri; Phan, Tai +25 more
A major subset of solar-terrestrial relations, responsible in particular for the driver of space weather phenomena, is the interaction between the Earth's magnetosphere and the solar wind. As one of the most important modes of the solar-wind-magnetosphere interaction, magnetic reconnection regulates the energy transport and energy release in the s…
The Capon method for Mercury's magnetic field analysis
Motschmann, Uwe; Toepfer, Simon; Narita, Yasuhito +1 more
Characterization of Mercury's internal and external magnetic field is one of the primary goals of the magnetometer experiment on board the BepiColombo MPO (Mercury Planetary Orbiter) spacecraft. A novel data analysis tool is developed to determine the Gauss coefficients in the multipole expansion using Capon's minimum variance projection method. T…
A Note on Capon's Minimum Variance Projection for Multi-Spacecraft Data Analysis
Narita, Yasuhito
Capon's minimum variance projection for the multi-point measurements is revisited using the method of likelihood function to derive the minimum variance projection and a simplified error estimate analytically. Theoretical construction of the minimum variance projection assumes a Gaussian form of the likelihood function and also regards the data co…
Ion-Scale Sideband Waves and Filament Formation: Alfvénic Impact on Heliospheric Plasma Turbulence
Motschmann, Uwe; Narita, Yasuhito
A mini-review is given about two recent discoveries in the solar wind turbulence research on ion-kinetic scales: the existence of sideband waves (or breakdown of the linear mode wave picture) and the wavevector anisotropy leading to a persistent filament formation in a wide range of plasma beta.
Spatial structure of ion-scale plasma turbulence
Motschmann, Uwe; Narita, Yasuhito; Comişel, Horia
Spatial structure of small-scale plasma turbulence is studied under different conditions of plasma parameter beta directly in the three-dimensional wave vector domain. Two independent approaches are taken: observations of turbulent magnetic field fluctuations in the solar wind measured by four Cluster spacecraft, and direct numerical simulations o…