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Energetic Particles in the Heliosphere
Heber, Bernd
The heliosphere is the region around the Sun that is filled by the solar wind and its embedded magnetic field. The interaction of the supersonic solar wind with the local interstellar medium leads to a transition from supersonic to subsonic speeds at the heliospheric termination shock. The latter is regarded to be the source of the anomalous compo…
Multiple flux rope events at the magnetopause observations by TC-1 on 18 March 2004
Wei, Y.; Zhang, T. L.; Dandouras, I. +7 more
From 23:10 to 23:50 UT on 18 March 2004, the Double Star TC-1 spacecraft detected eight flux ropes at the outbound crossing of the southern dawnside magnetopause. A notable guide field existed inside all ropes. In the mean time the Cluster spacecraft were staying in the magnetosheath and found that the events occurred under the condition of southw…
Debris Discs Around Stars: The 2004 ISO Legacy
de Muizon, Marie Jourdain
Debris discs around stars were first discovered by the Infrared Astronomical Satellite (IRAS) in 1983. For the first time material orbiting another star than the Sun, but distinct from a circumstellar envelope, was observed through its far infrared emission. This major discovery motivated astronomers to investigate those discs by further analyzing…
New variable and multiple stars in the lower part of the Cepheid instability strip
Lampens, P.; Fremat, Y.; van Cauteren, P. +1 more
We obtained high-resolution spectra for 33 A-type stars during 4 consecutive nights. All our targets are Hipparcos program stars located in the lower part of the Cepheid instability strip which show hints for variability in radial velocity of a yet unidentified nature. CCD photometry was acquired for some of the most promising candidates and used …
Coronal oscillation above a supergranular cell of the quiet Sun chromospheric network?
Peter, H.; Gontikakis, C.; Dara, H. C.
We have detected an oscillation in the low corona, using a raster of the SUMER EUV spectrograph in the Ne viii, 770 Å line formed at about 700 000 K. The oscillation was found in the Ne viii Doppler map above the interior of a supergranular cell of the chromospheric network in the quiet Sun, while it is absent in line radiance. The photospheric ma…
Radiation hardness studies for the X-ray Solar Monitor (XSM) onboard the ESA SMART-1 mission
Andersson, H.; Alha, L.; Huovelin, J. +7 more
The X-ray detection performance of the X-ray Solar Monitor (XSM, onboard the ESA SMART-1 satellite) Si pin -detector was studied after exposure to several types of radiation typical of the space environment (i.e. protons, electrons and γ -radiation). The detector withstands the tested radiation types at the expected mission dose levels. Hence, the…
The Internet as a Virtual Observatory: New Elements for Ten Long Period Variables in Aquila
Mattei, J. A.; Bedient, J.; Richwine, P. +1 more
Data freely available on the Internet-CCD images from Stardial, data from the Northern Sky Variability Survey (NSVS), the Automated All-Sky Survey (ASAS), the Hipparcos Epoch Photometry Annex, and visual observations from the American Association of Variable Star Observers (AAVSO)-are combined to characterize the behavior of 10 long period variabl…
Cluster at the Bow Shock: Status and Outlook
Balogh, A.; Thomsen, M. F.; Lembège, B. +11 more
INTEGRAL reveals a new class of obscured high mass X-ray binaries: focus on IGR J16318-4848
Chaty, Sylvain; Filliatre, Philippe
The X-ray source IGR J16318-4848 is the first source discovered by INTEGRAL on 2003, January 29, exhibiting a very high column density. On 2003, February, 23-25 we triggered a Target of Opportunity (ToO) program using the EMMI (optical) and SOFI (near-infrared, NIR) instruments on the New Technology Telescope of the European Southern Observatory (…
Continuous lobe reconnection in the mid-tail and its relationship to substorms: Cluster observations of continuous lobe reconnection in the mid-magneto tail
Cao, J. B.; Reme, H.; Korth, A. +9 more
When the IMF turns southward, a great amount of magnetic energy is stored in the magnetotail, and the electric field across the magnetotail substantially enhances. As long as magnetic reconnection (MR) in the magnetotail initiates and continues, the magnetic field and plasma in the central plasma sheet are carried away to the near-Earth and down t…