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Titan's influence on Saturnian substorm occurrence
Russell, C. T.; Wei, H. Y.; Dougherty, M. K. +2 more
Substorms play an important role in the energization and transport of plasmas in planetary magnetospheres, including the shedding of the mass added by moons in the case of Jupiter and Saturn. Mass shedding occurs through rapid reconnection in the near tail resulting in dipolarization on the magnetospheric side of the reconnection point and plasmoi…
Dust in the disk winds from young stars as a source of the circumstellar extinction
Grinin, V. P.; Tambovtseva, L. V.
We consider the problem of dust grain survival in the disk winds from T Tauri and Herbig Ae stars. For our analysis, we have chosen a disk wind model in which the gas component of the wind is heated through ambipolar diffusion to a temperature of ∼104 K. We show that the heating of dust grains through their collisions with gas atoms is …
XMM-Newton Observations of CXOU J010043.1-721134: The First Deep Look at the Soft X-Ray Emission of a Magnetar
Tiengo, A.; Mereghetti, S.; Esposito, P.
We present the analysis of six XMM-Newton observations of the anomalous X-ray pulsar CXOU J010043.1-721134, the magnetar candidate characterized by the lowest interstellar absorption. In contrast with all the other magnetar candidates, its X-ray spectrum cannot be fitted by an absorbed power-law plus blackbody model. The sum of two (absorbed) blac…
Lens Galaxy Properties of SBS 1520+530: Insights from Keck Spectroscopy and AO Imaging
Auger, M. W.; Thompson, D.; Fassnacht, C. D. +3 more
We report on an investigation of the SBS 1520+530 gravitational lens system. We have used archival Hubble Space Telescope (HST) imaging, Keck spectroscopic data, and Keck adaptive optics (AO) imaging to study the lensing galaxy and its environment. The AO imaging has allowed us to fix the lens galaxy properties with a high degree of accuracy when …
Observations of the development of electron temperature anisotropies in Earth's magnetosheath
Schwartz, S. J.; Masood, W.
Electron velocity distributions in Earth's magnetosheath exhibit a number of nonequilibrium characteristics, including a flat-topped shape at thermal energies and anisotropies relative to the magnetic field, with T⊥e > T∥e. These features are related to processes at the bow shock and within the magnetosheath. In the presen…
NGC 346 in the Small Magellanic Cloud. IV. Triggered Star Formation in the H II Region N66
Henning, Thomas; Gouliermis, Dimitrios A.; Brandner, Wolfgang +4 more
Stellar feedback, expanding H II regions, wind-blown bubbles, and supernovae are thought to be important triggering mechanisms of star formation. Stellar associations, being hosts of significant numbers of early-type stars, are the loci where these mechanisms act. In this part of our photometric study of the star-forming region NGC 346/N66 in the …
Holmberg IX: The Nearest Young Galaxy
Sabbi, E.; Gallagher, J. S.; Smith, L. J. +2 more
We present a study of the M81 companion dwarf irregular galaxy Holmberg IX using deep images taken with the Wide Field Channel of the Advanced Camera for Surveys on board the Hubble Space Telescope. Based on color-magnitude diagrams the resolved stellar population toward Holmberg IX contains numerous stars with ages of lesssim200 Myr as well as ol…
Comparison of multi-point measurements of current sheet structure and analytical models
Malova, H. V.; Petrukovich, A. A.; Zelenyi, L. M. +5 more
Current density profiles of 22 thin current sheets, crossed by four Cluster spacecraft in the magnetotail are compared with the self-consistent model of anisotropic 1-D equilibrium, including several species of quasi-adiabatic (transient) ions and drifting electrons. In order to examine ion-scale features of the current density profile Cluster dat…
Dynamics of coronal mass ejections. The mass-scaling of the aerodynamic drag
Vršnak, B.; Vrbanec, D.; Čalogović, J.
Context: Coronal and interplanetary propagation of coronal mass ejections (CMEs) is strongly affected by aerodynamic drag.
Aims: The dependence of the drag acceleration on the mass of the CMEs is investigated to establish a quantitative empirical relationship, which might be important in semi-empirical space-weather forecasting.
Methods: W…
Solar off-limb line widths: Alfvén waves, ion-cyclotron waves, and preferential heating
Dolla, L.; Solomon, J.
Context: Alfvén waves and ion-cyclotron absorption of high-frequency waves are frequently brought into models devoted to coronal heating and fast solar-wind acceleration. Signatures of ion-cyclotron resonance have already been observed in situ in the solar wind (HELIOS spacecrafts) and, recently, in the upper corona (UVCS/SOHO remote-sensing resul…