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Development of a 3-D Plasmapause Model With a Back-Propagation Neural Network
He, Fei; Lei, Jiuhou; Zhang, Xiao-Xin +2 more
Several empirical models have been previously developed to study the characteristics of the global plasmasphere. A three-dimensional solar wind-driven global dynamic plasmapause model was developed in this study using a back-propagation neural network based on multisatellite measurements. Our database contains 37,859 plasmapause crossing events fr…
Link between trees of fragmenting granules and deep downflows in MHD simulation
Malherbe, J. M.; Roudier, T.; Frank, Z. +1 more
Context. Trees of fragmenting granules (TFG) and associated flows are suspected to play a major role in the formation of the network in the quiet Sun. We investigate the counterparts, in terms of dynamics, of surface structures detectable by high resolution observations in deeper layers up to 15 Mm, which are only available from numerical simulati…
Equatorial Magnetosonic Waves Observed by Cluster Satellites: The Chirikov Resonance Overlap Criterion
Aryan, Homayon; Walker, Simon N.; Balikhin, Michael A. +1 more
Magnetosonic waves play an important role on the overall dynamics of relativistic radiation belt electrons. Numerical codes modeling the evolution of the radiation belts often account for wave-particle interaction with magnetosonic waves. The diffusion coefficients incorporated in these codes are generally estimated based on the results of statist…
Analysis of Field-Aligned Currents in the High-Altitude Nightside Auroral Region: Cluster Observation
Shin, Youra; Lee, Ensang; Lee, Jae-Jin
In this paper we present analysis of current density when the Cluster spacecraft pass the nightside auroral region at about 4-5 RE from the center of Earth. The analysis is made when the inter-spacecraft separation is within 200 km, which allows all four spacecraft to be situated inside the same current sheet. On 22 February 2002, two field-aligne…
Surveying the Bright Stars by Optical Interferometry. II. A Volume-limited Multiplicity Survey of Main-sequence F Stars
Hutter, D. J.; Tycner, C.; Zavala, R. T. +3 more
We present the results of a multiplicity survey for a volume-limited sample of 29 main-sequence F0-G0 stars within 17 pc conducted with the Navy Precision Optical Interferometer (NPOI). Four companions were detected in previously known binary systems. The results for these stars show good agreement with previously published orbits. For one of thes…
A study on radio-loud interacting/non-interacting CMEs-associated SEPs and solar flares
Feng, Li; Pappa Kalaivani, P.; Prakash, O. +4 more
We have established a data set of 58 major hybrid SEP events associated with meter-to-decahectometer wavelength (m-to-DH) type II bursts, solar flares, and radio-load CMEs during the period of 1997-2014. The main focus of our study is to address the following two questions: Does the interaction of CMEs play a role in the enhancement of SEP intensi…
V1082-Sgr: A magnetic cataclysmic variable with a lobe-filling companion star
Xu, Xiaojie; Shao, Yong; Li, Xiang-Dong
V1082 Sgr is a cataclysmic variable with accretion luminosity above 1034 erg s-1, indicating a mass-transfer rate above 10^{-9} M_{⊙ } yr-1. However, its K-type companion was suggested to be underfilling its Roche lobe (RL), making the high mass-transfer rate a mystery. In this work we propose a possible model to e…
Global spectrophotometric properties of Asteroid (21) Lutetia using Rosetta-OSIRIS images
Masoumzadeh, N.; Boehnhardt, H.
We present a spectrophotometric analysis of the surface areas of asteroid (21) Lutetia that were imaged during the Rosetta flyby on July 2010 by the OSIRIS camera in the wavelength range 269 to 989 nm. A spectral slope change with respect to phase angle is found and interpreted as being due to areal diversity of Lutetia's surface. We applied Minna…
South-North Hemispheric Asymmetry of the FAE Distribution Around the Cusp Region: Cluster Observation
Dunlop, Malcolm; Carr, Chris; Torkar, Klaus +5 more
Cluster data from late July to early October were used to study the distribution of field-aligned electron (FAE) events around the two cusps. An FAE event was defined as electron parallel flux >3 × 108 (cm2 s)-1. The total number of FAE events around the two cusps was basically identical, but downward FAE events…
Integrated Spectra of Milky Way Globular Clusters
Trevisan, M.; Barbuy, B.; Moura, T. C. +1 more
Integrated spectra of Milky Way globular clusters (GCs) are reproduced by computing synthetic spectra taking into account individual element abundances. Five clusters were selected from their location in the Galactic bulge, for which integrated spectra were available in the WiFeS Atlas of Galactic Globular Cluster Spectra project. Our aim is to fu…