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Banana-polarized solitons in anisotropic plasmas related to Ulysses observations
Dubinin, E.; Sauer, K.; Baumgärtel, K. +1 more
Localized magnetic compressions associated with a rotation in the magnetic field direction have recently been reported after surveying Ulysses high-resolution data. Although the observed structures have similarities to usual Hall-MHD solitons, the banana-type polarization of the described rare events is a decisive signature which counts against su…
Keck HIRES Spectroscopy of Candidate Post-T Tauri Stars
Deliyannis, Constantine P.; Soderblom, David R.; King, Jeremy R. +2 more
We use high signal-to-noise ratio (~150-450), high-resolution (R ~ 45,000) Keck HIRES spectroscopy of 13 candidate post-T Tauri stars (PTTs) to derive basic physical parameters, lithium abundances, and radial velocities. We place our stars in the Mv-Teff plane for use in determining approximate ages from pre-main-sequence iso…
Spitzer IRS Imaging and Spectroscopy of the Luminous Infrared Galaxy NGC 6052 (Mrk 297)
Houck, J. R.; Charmandaris, V.; Whelan, D. G. +2 more
We present photometric and spectroscopic data of the interacting starburst galaxy NGC 6052 obtained with the Spitzer Space Telescope. The mid-infrared (MIR) spectra of the three spatially resolved regions in the galaxy are remarkably similar and are consistent with dust emission from young, nearly coeval stellar populations. Analysis of the bright…
Fluid versus simulation model of solitons in solar wind: Application to Ulysses observations
Dubinin, E.; Sauer, K.; Baumgärtel, K. +1 more
This paper continues recent efforts based on Hall-MHD theory (Sauer et al., 2007) to explain a new class of magnetically compressive solitary structures in the interplanetary space, observed by the Ulysses magnetometer (Rees et al., 2006). The theoretical basis is extended by a kinetic approach via one-dimensional hybrid code simulations which rev…
Signatures of magnetic reconnection in solar radio observations?
Aurass, Henry
Magnetic reconnection occurs during eruptive processes (flares, CMEs) in the solar corona. This leads to a change of magnetic connectivity. Nonthermal electrons propagate along the coronal magnetic field thereby exciting dm- and m-wave radio burst emission after acceleration during reconnection or other energy release processes in heights of some …
α TrA Junior
Ayres, Thomas R.; Harper, Graham M.; Brown, Alexander
The ``hybrid chromosphere'' star α Trianguli Australis (K2 Ib-IIa) displays atypical coronal properties for its class: elevated soft X-ray emission, flare outbursts, and a superhot (T~10 MK) spectrum. The Wide Field Planetary Camera 2 (WFPC2) on board the Hubble Space Telescope (HST) now has found a faint object close to the red supergiant, 0.4" n…
CoRoT data contribution to stellar seismology
Auvergne, M.; Baudin, F.; Michel, E. +2 more
At the time to submit papers for these proceedings, CoRoT will be launched in less than one month. The scientific programme, the instrument and the mission profile have been described in several places recently (e.g., Baglin et al. 2006, Michel et al. 2006a) and a dedicated volume (Fridlund et al. 2006) has been published, where these aspects are …
Imaging Spectroscopy of a Gradual Hardening Flare on 2000 November 25
Masuda, Satoshi; Nakajima, Hiroshi; Yokoyama, Takaaki +5 more
We present an examination of multiwavelength observations of an M8.2 long-duration flare which occurred on 2000 November 25. During the flare, we can see a hard X-ray (HXR) source on one Hα flare ribbon in the HXR images obtained with the Hard X-ray Telescope aboard Yohkoh, and a compact microwave emission source on the other flare ribbon in the d…
Technology perspectives in the future exploration of Venus
Cutts, James A.; Balint, Tibor S.; Chassefiere, Eric +1 more
Science goals to understand the origin, history and environment of Venus have been driving international space exploration missions for over 40 years. Today, Venus is still identified as a high priority science target in NASA's Solar System Exploration Roadmap, and clearly fits scientific objectives of ESA's Cosmic Vision Program in addition to th…
Coronal mass ejections and the associated activities on the solar disk observed on October 26, 2003
Zhang, H.; Lin, J.; Stenborg, G. A. +1 more
Aims:Coronal mass ejections (CMEs) are usually considered fast (slow) if their velocities are greater (less) than 500 km s-1. It is generally believed that fast CMEs are well associated with activity manifested on the solar disk, such as solar flares, and that slow CMEs are often associated with filament eruptions out of active regions …