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Millisecond radio spikes in the decimetre band and their related active solar phenomena
Siarkowski, M.; Falewicz, R.; Rudawy, P. +2 more
We present here a brief description of thirteen events of the narrowband solar millisecond radio spike emissions observed between February 2000 and December 2001. The total observing time was 1990.4 h, collected during the 357 observing days. The data were collected with the 15-m radio telescope and fast radiospectrograph of Toruń Observatory, Pol…
HST and spectroscopic observations of the L1551 IRS5 jets (HH154)
Liseau, R.; White, G. J.; Favata, F. +4 more
We have carried out a thorough optical study of the closest star formation jet. The inner arcminute surrounding the class 0/I binary protostar L1551 IRS5 and its associated jet (HH154) have been observed using the Hubble Space Telescope with the WFPC2 camera, the ESO New Technology Telescope with the EMMI spectrograph and the Nordic Optical Telesc…
Correlation between coronal hole and quiet Sun intensities: Evidence for continuous reconnection
Del Zanna, G.; Raju, K. P.; Bromage, B. J. I. +1 more
Intensities of 12 strong EUV emission lines in a coronal hole and the neighbouring quiet Sun region have been obtained from SOHO/CDS observations made in August and September 1996. The field of view is 1 arcmin wide by 4 arcmin, with a series of observations made at different spatial locations on the boundary of the north polar hole and its large …
Proton and electron acceleration by quasi-perpendicular fast magnetosonic shocks in interplanetary space
Simnett, G. M.; Forsyth, R. J.; Sakai, J. -I.
Recent observations from the Ulysses spacecraft (Simnett 2003, Sol. Phys., 213, 387) have measured the energy spectrum of the ambient ions associated with the passage of a fast magnetosonic quasi-perpendicular shock driven by a coronal mass ejection (CME). Near the shock front the energy spectrum of the accelerated ions, which are predominantly pr…
The spectroscopic orbits and other parameters of the symbiotic binary FN Sgr
Pereira, C. B.; Mikołajewska, J.; Ferrer, O. E. +4 more
We present a study of the eclipsing symbiotic binary FN Sgr with a period of 568.3 days determined photometrically and confirmed spectroscopically. The hot component underwent a 2.5 mag eruption covered by most of our spectroscopic observations. In particular, we have determined for the first time spectroscopic orbits based on the radial velocity …
Phase diversity restoration of sunspot images. II. Dynamics around a decaying sunspot
Roudier, Th.; Muller, R.; Márquez, I. +2 more
Two time series, taken simultaneously in the G-band and in white-light, and corrected for telescope aberrations and turbulence perturbations using the method of phase diversity, are employed to study the motions of granules and G-band bright points (GBPs) in the moat of an old regular sunspot. Local correlation tracking and feature tracking have b…
XMM-Newton detection of type I X-ray bursts in M 31
Pietsch, W.; Haberl, F.
We searched for X-ray bursts in XMM-Newton archival data of X-ray sources in
The Leo Triplet: Common origin or late encounter?
Sil'chenko, O. K.; Afanasiev, V. L.
The kinematics, structure, and stellar population properties in the centers of two early-type spiral galaxies of the Leo Triplet, NGC 3627 and NGC 3623, are studied by means of integral-field spectroscopy. Unlike our previous targets, NGC 3384/NGC 3368 in the Leo I Group and NGC 5574/NGC 5576 in LGG 379, NGC 3623 and NGC 3627 do not appear to expe…
XMM-Newton observation of the young open cluster Blanco 1. II. X-ray time variability and flares
Micela, G.; Reale, F.; Sciortino, S. +1 more
We study the X-ray variability of the young open cluster Blanco 1 observed with the EPIC camera on board the XMM-Newton X-ray observatory. The time coverage of EPIC observations has allowed us to address short time scale (hours) variability, while the comparison with previous ROSAT observations has allowed us to investigate the variability on time…
AFS dynamics in a short-lived active region
Romano, P.; Spadaro, D.; Contarino, L. +3 more
In the framework of the study on active region emergence, we report the results obtained from the analysis of the short-lived (7 days) active region NOAA 10407. The data used were acquired during an observational campaign carried out with the THEMIS telescope in IPM mode in July 2003, coordinated with other ground- and space-based instruments (INA…