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INTEGRAL detection of hard X-rays from NGC 6334: nonthermal emission from colliding winds or an AGN?
McBreen, B.; Terrier, R.; Rauw, G. +12 more
Aims.We report the detection of hard X-ray emission from the field of the star-forming region NGC 6334 with the International Gamma-Ray Astrophysics Laboratory INTEGRAL .Methods.The JEM-X monitor and ISGRI imager aboard INTEGRAL and Chandra ACIS imager were used to construct 3-80 keV images and spectra of NGC 6334.Results.The 3-10 keV and 10-35 ke…
An X-Ray Observation of the L1251 Dark Cloud
Simon, Theodore
An X-ray image of the L1251 dark cloud in Cepheus was obtained with the XMM-Newton telescope. More than three dozen sources were detected above a 3 σ limit in X-ray luminosity of LX=1029.0 ergs s-1. Among the detections are eight optically visible T Tauri stars, which had been identified in earlier work from their …
Flow speed inside the brightness boundary of coronal streamers
Suess, S. T.; Nerney, S.
Density measurements in the legs of coronal streamers, where there might be outflow, are reproduced here using a magnetohydrodynamic model of the flow inside the brightness boundary of streamers. The model returns values for the flow speed and stream tube geometry (spreading) between the base and a few solar radii. The flow speed is consistent wit…
Multiple acceleration of protons on the Sun and their free propagation to the Earth on January 20, 2005
Struminsky, A. B.
We analyze the observations of solar protons with energies >80 MeV near the Earth and the January 20, 2005, solar flare in various ranges of the electromagnetic spectrum. Within approximately the first 30 min after their escape into interplanetary space, the solar protons with energies above 80 MeV propagated without scattering to the Earth and…
Thermal Composition and Doppler Velocities in a Transequatorial Loop at the Solar Limb
Brosius, Jeffrey W.
We observed a transequatorial loop (TEL) connecting NOAA Active Regions 10652 and 10653 at the west solar limb on 2004 July 29 with the Extreme-Ultraviolet Imaging Telescope (EIT) and the Coronal Diagnostic Spectrometer (CDS) aboard the Solar and Heliospheric Observatory. Only the loop's northern leg was observed with CDS. The loop appeared bright…
On the Lyman α and β lines in solar coronal streamers
Li, B.; Labrosse, N.; Li, X.
Aims.We investigate the formation of the H I Lyman α and Lyman β lines in an equatorial coronal streamer. Particular attention is paid to frequency redistribution for the scattering of the incident radiation. The properties of the spectral lines are studied.
Methods.The coronal model is given by a global 2.5D three fluid solar wind model with α…
Electron Acceleration and Transport During the November 5, 1998 Solar Flare At ∼13:34 UT
Aulanier, G.; Yan, Y.; Karlický, M. +3 more
This paper deals with a detailed analysis of spectral and imaging observations of the November 5, 1998 (Hα 1B, GOES M1.5) flare obtained over a large spectral range, i.e., from hard X-rays to radiometric wavelengths. These observations allowed us to probe electron acceleration and transport over a large range of altitudes that is to say within sma…
Optimal filtering of solar images using soft morphological processing techniques
Fletcher, L.; Marshall, S.; Hough, K.
Context: .CCD images obtained by space-based astronomy and solar physics are frequently spoiled by galactic and solar cosmic rays, and particles in the Earth's radiation belt, which produces an overlaid, often saturated, speckle.
Aims: .We describe the development and application of a new image-processing technique for the removal of this nois…
Why are there stationary EIT wave fronts
Chen, P. F.; Shibata, K.; Fang, C.
EIT waves are often observed to be propagating EUV enhancements followed by an expanding dimming region after the launch of CMEs. It was widely assumed that they are the coronal counterparts of the chromospheric Moreton waves, though the former are three or more times slower. The existence of a stationary “EIT wave” front in some events, however, …
Exploration of Mars in SPICAM-IR experiment onboard the Mars-Express spacecraft: 1. Acousto-optic spectrometer SPICAM-IR
Gondet, B.; Dimarellis, E.; Reberac, A. +12 more
The acousto-optic spectrometer of the near infrared range, which is a part of the spectrometer SPICAM onboard the Mars-Express spacecraft, began to operate in the orbit of Mars in January 2004. In the SPICAM experiment, a spectrometer on the basis of an acousto-optic filter was used for the first time to investigate other planets. During one and a…