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Study of Magnetic Channel Structure in Active Region 10930
Jing, Ju; Wang, Haimin; Tan, Changyi +2 more
The concept of "magnetic channel" was first introduced by Zirin & Wang. They were defined as a series of oppositely directed vertical-field inversions separated by extremely narrow elongated transverse fields. In this paper, we utilized unprecedented filtergraph and spectropolarimetry observations from Hinode, and studied the evolution and phy…
Moonlets and clumps in Saturn's F ring
Nicholson, Philip D.; Hedman, Matthew M.; Colwell, Joshua E. +2 more
Cassini UVIS star occultations by the F ring detect 13 events ranging from 27 m to 9 km in width. We interpret these structures as likely temporary aggregations of multiple smaller objects, which result from the balance between fragmentation and accretion processes. One of these features was simultaneously observed by VIMS. There is evidence that …
Old Globular Clusters in Magellanic-Type Dwarf Irregular Galaxies
Georgiev, Iskren Y.; Goudfrooij, Paul; Puzia, Thomas H. +1 more
We have performed a search for old globular clusters (GCs) using archival F606W and F814W Hubble Space Telescope/Advanced Camera for Surveys images of 19 Magellanic-type dwarf Irregular (dIrr) galaxies. Those dIrrs reside in nearby (2-8 Mpc) associations of dwarf galaxies only. All dIrrs have absolute magnitudes fainter than or equal to that of th…
Statistical morphology of ENA emissions at Saturn
Krimigis, S. M.; Mitchell, D. G.; Roelof, E. C. +2 more
The Magnetospheric Imaging Instrument (MIMI) on the Cassini spacecraft is providing the first energetic neutral particle (ENA) measurements in the magnetosphere of Saturn. Advantageous spacecraft orbits during the first 120 days of 2007 allowed ENA observations to be mapped to the equatorial plane of the planet and surveyed as a statistical ensemb…
Flare lines in Hinode EIS spectra
Del Zanna, G.
We aim to identify the brightest hot emission lines in Hinode EIS spectra, and suggest the best ones to be used in flare observations. The EIS database was searched in order to find suitable datasets to identify the prominent lines. A B2-class flare spectrum was found. Most previous identifications are confirmed, however some are revised by noting…
A Massive-Star-forming Infrared Loop around the Crab-like Supernova Remnant G54.1+0.3: Post-Main-Sequence Triggered Star Formation?
Lee, Jeong-Eun; Onaka, Takashi; Koo, Bon-Chul +6 more
We report the discovery of a star-forming loop around the young, Crab-like supernova remnant (SNR) G54.1+0.3 using the AKARI infrared satellite. The loop consists of at least 11 young stellar objects (YSOs) embedded in a ringlike diffuse emission of radius ~1'. The YSOs are bright in the mid-infrared and are also visible in the Spitzer Space Teles…
Washington CCD Photometry of the Globular Cluster System of the Giant Elliptical Galaxy M60 in Virgo
Lee, Myung Gyoon; Hwang, Ho Seong; Geisler, Doug +3 more
We present a photometric study of the GCs in the giant elliptical galaxy M60 in the Virgo Cluster, based on deep, relatively wide field Washington CT1 CCD images. The CMD reveals a significant population of GCs in M60 and a large number of young luminous clusters in NGC 4647, a small companion spiral northwest of M60. The color distribu…
Globular Clusters in the Outer Galactic Halo: AM-1 and Palomar 14
Dotter, Aaron; Sarajedini, Ata; Yang, Soung-Chul
AM-1, at ~120 kpc, and Palomar 14 (Pal 14), at ~70 kpc, are two of the most distant Galactic globular clusters (GCs) known. We present Hubble Space Telescope Wide Field Planetary Camera 2 photometry of AM-1 and Pal 14 that reveals unprecedented depth and detail in the color-magnitude diagrams of these two clusters. Absolute and relative age measur…
CME Earthward Direction as an Important Geoeffectiveness Indicator
Cho, K. -S.; Kim, K. -H.; Moon, Y. -J. +7 more
Frontside halo coronal mass ejections (CMEs) are generally considered as potential candidates for producing geomagnetic storms, but there was no definite way to predict whether they will hit the Earth or not. Recently Moon et al. suggested that the degree of CME asymmetries, as defined by the ratio of the shortest to the longest distances of the C…
The Solar Wind Power from Magnetic Flux
McComas, D. J.; Schwadron, N. A.
Observations of the fast, high-latitude solar wind throughout Ulysses' three orbits show that solar wind power correlates remarkably well with the Sun's total open magnetic flux. These observations support a recent model of the solar wind energy and particle sources, where magnetic flux emergence naturally leads to an energy flux proportional to t…