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Preliminary empirical model of inner boundary of ion plasma sheet
Dandouras, I.; Cao, J. B.; Reme, H. +4 more
The penetration of the plasma sheet into the inner magnetosphere is important to both ring current formation and spacecraft charging at geosynchronous orbit. This paper, using hot ion data recorded by HIA of TC-1/DSP, establishes an empirical model of the inner boundary of ion plasma sheet (IBIPS) on the near equatorial plane. All IBIPS are locate…
The effects of solar flares, coronal mass ejections, and co-rotating interaction regions on the Venusian 5577 A oxygen green line
Gray, Candace
The Venusian 5577.3 A OI (1S - 1D) (oxygen green line) nightglow emission is known to be highly temporally variable. The reason for this variability is unknown. We propose that the emission is due to electron precipitation from intense solar storms. For my dissertation, I observed the Venusian green line after solar flares, coronal mass ejections …
Cluster observations of unusually high concentration of energetic O+ carried by flux ropes in the nightside high-latitude magnetosheath during a storm initial phase
Dandouras, I.; Reme, H.; Lui, A. T. Y. +6 more
We present measurements from Cluster spacecraft to investigate the energetic singly charged oxygen ions, O+, within the flux ropes in the nightside high-latitude magnetosheath during the initial phase of an intense storm on 24 October 2011. Three magnetic flux ropes were identified by Cluster 4 in the intervals from 20:10 UT to 20:20 UT…
Proton and alpha particle precipitation onto the upper atmosphere of Venus
Fedorov, A.; Barabash, S.; Futaana, Y. +5 more
We study the precipitation of protons and alpha-particles onto the upper atmosphere of Venus, using particle data recorded by the Venus Express spacecraft inside the induced magnetosphere. Our investigations are limited to the dayside close to the terminator. We observe on average a net downward flux of protons, which originate partly from the pla…
Particle-in-cell modeling of Dual Segmented Langmuir Probe on PROBA2
Imtiaz, Nadia; Marchand, Richard
We model the current characteristics of the Dual Segmented Langmuir Probe (DSLP), which is a part of the scientific payload of the ESA satellite PROBA2. It is used for the directional measurement of plasma parameters in the ionosphere at an altitude of approximately 725 km. The DSLP consists of two independent segmented Langmuir probes. Each probe…
Study of COROT 310266512: A Light Curve with Primary, Secondary, and Tertiary Eclipses
Chou, Dean-Yi; Fernández Fernández, Javier
Application of Vector Spherical Harmonics and Kernel Regression to the Computations of OMM Parameters
Marco, F. J.; Martínez, M. J.; López, J. A.
The high quality of Hipparcos data in position, proper motion, and parallax has allowed for studies about stellar kinematics with the aim of achieving a better physical understanding of our galaxy, based on accurate calculus of the Ogorodnikov-Milne model (OMM) parameters. The use of discrete least squares is the most common adjustment method, but…
Source Identification in the IGR J17448-3232 Field: Discovery of the Scorpius Galaxy Cluster
Wik, Daniel R.; Tomsick, John A.; Chaty, Sylvain +2 more
We use a 43 ks XMM-Newton observation to investigate the nature of sources first distinguished by a follow-up Chandra observation of the field surrounding INTEGRAL source IGR J17448-3232, which includes extended emission and a bright point source previously classified as a blazar. We establish that the extended emission is a heretofore unknown mas…
Mid-IR Enhanced Galaxies in the Coma & Virgo Clusters: Lenticulars with a High Star Formation Rate
Riguccini, L.; Amblard, A.; Temi, P. +2 more
We explore the properties of early-type galaxies (ETGs), including ellipticals (E) and lenticulars (S0), in rich environments, such as clusters of galaxies (Virgo and Coma). The L24/LK distribution of ETGs in both Virgo and Coma clusters shows that some S0s have a much larger L24/LK ratio (0.5 to ∼2 dex)…
Resolving the Merging Planck Cluster PLCK G147.3-16.6 with GISMO
van Weeren, R. J.; Bulbul, E.; Kovács, A. +6 more
The Planck satellite has recently completed an all-sky galaxy cluster survey exploiting the thermal Sunyaev-Zel’dovich (SZ) effect to locate some of the most massive systems observable. With a median redshift of < z> =0.22, the clusters found by Planck at z\gt 0.3 are proving to be exceptionally massive and/or disturbed systems. One notable …