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Projection effects in coronal mass ejections
Vršnak, B.; Žic, T.; Sudar, D. +1 more
Context: Basic observational parameters of a coronal mass ejection (CME) are its speed and angular width. Measurements of the CME speed and angular width are severely influenced by projection effects.
Aims: The goal of this paper is to investigate a statistical relationship between the plane-of-sky speeds of CMEs and the direction of their pro…
Energetics of solar coronal mass ejections
Vourlidas, A.; Subramanian, P.
Aims:We investigate whether solar coronal mass ejections are driven mainly by coupling to the ambient solar wind or through the release of internal magnetic energy.
Methods: We examine the energetics of 39 flux-rope like coronal mass ejections (CMEs) from the Sun using data in the distance range ~2-20 R⊙ from the Large Angle Spectro…
UV bright globular clusters in M87: more evidence for super-He-rich stellar populations?
O'Connell, R. W.; Kaviraj, S.; Yoon, S. -J. +3 more
We study the ultraviolet (UV) and optical properties of 38 massive globular clusters (GCs) in the Virgo elliptical, M87, imaged using the STIS and WFPC2 instruments onboard the Hubble Space Telescope. The majority of these GCs appear extremely bright in the far-UV (FUV) - roughly a magnitude brighter than their Galactic counterparts with similar m…
Encounter of the Ulysses Spacecraft with the Ion Tail of Comet MCNaught
Geiss, J.; McComas, D. J.; Smith, E. J. +12 more
Comet McNaught was the brightest comet observed from Earth in the last 40 years. For a period of five days in early 2007 February, four instruments on the Ulysses spacecraft directly measured cometary ions and key properties of the interaction of the comet's ion tail with the high-speed solar wind from the polar regions of the Sun. Because of the …
A Catalog of Star Cluster Candidates in M33
Sarajedini, Ata; Mancone, Conor L.
We present a new catalog of star cluster candidates in the nearby spiral galaxy M33. It is based on eight existing catalogs wherein we have cross-referenced identifications and endeavored to resolve inconsistencies between them. Our catalog contains 451 candidates, of which 255 are confirmed clusters based on Hubble Space Telescope and high-resolu…
The Coronal-dimming Footprint of a Streamer-Puff Coronal Mass Ejection: Confirmation of the Magnetic-Arch-Blowout Scenario
Moore, Ronald L.; Sterling, Alphonse C.
A streamer puff is a recently identified variety of coronal mass ejection (CME) of narrow to moderate width. It (1) travels out along a streamer, transiently inflating the streamer but leaving it largely intact, and (2) occurs in step with a compact ejective flare in an outer flank of the base of the streamer. These aspects suggest the following m…
Physical properties of cometary and interplanetary dust
Lasue, J.; Okada, Y.; Mukai, T. +1 more
In the absence of numerous in situ studies, physical properties of cosmic dust may be derived from observations of their light scattering and thermal properties, through numerical simulations making use of realistic assumptions. Estimations about cometary and interplanetary dust composition, structure, size, as well as about their light scattering…
3D global multi-species Hall-MHD simulation of the Cassini T9 flyby
Neubauer, Fritz M.; Russell, Christopher T.; Gombosi, Tamas I. +8 more
The wake region of Titan is an important component of Titan's interaction with its surrounding plasma and therefore a thorough understanding of its formation and structure is of primary interest. The Cassini spacecraft passed through the distant downstream region of Titan on 18:59:30 UT Dec. 26, 2005, which is referred to as the T9 flyby and provi…
Kinematics of gas and stars in the circumnuclear star-forming ring of NGC3351
Terlevich, Roberto; Terlevich, Elena; Díaz, Ángeles I. +2 more
We have measured gas and stellar velocity dispersions in five circumnuclear star-forming regions (CNSFRs) and the nucleus of the barred spiral galaxy NGC3351. The stellar dispersions have been obtained from high-resolution spectra of the CaII triplet (CaT) lines at λλ8494, 8542, 8662Å, while the gas velocity dispersions have been measured by Gauss…
XMM-Newton study of 0.012 < z < 0.024 groups - I. Overview of the IGM thermodynamics
Finoguenov, A.; Ponman, T. J.; Osmond, J. P. F. +1 more
We study the thermodynamic properties of the hot gas in a sample of groups in the 0.012-0.024 redshift range, using XMM-Newton observations. We present measurements of temperature, entropy, pressure and iron abundance. Non-parametric fits are used to derive the mean properties of the sample and to study dispersion in the values of entropy and pres…