Search Publications
EIT and TRACE responses to flare plasma
Mason, H. E.; Del Zanna, G.; Tripathi, D. +1 more
Aims.To understand the contribution of active region and flare plasmas to the λ195 channels of SOHO/EIT (Extreme-ultraviolet Imaging Telescope) and TRACE (Transition Region and Coronal Explorer).
Methods: .We have analysed an M8 flare simultaneously observed by the Coronal Diagnostic Spectrometer (CDS), EIT, TRACE and RHESSI. We obtained synth…
First broad band study of the mysterious source 1E 1743.1-2843
Sidoli, L.; Ubertini, P.; Bazzano, A. +4 more
Context: .In the last years, the persistent source 1E 1743.1-2843 has been observed in the X-rays, but never above 20 keV. In previous works, it was stressed that a possible high energy emission could give further indications on the accreting object nature which remains still unknown.
Aims: .We present here more than two years of 1E 1743.1-284…
Neoclassical bootstrap current in solar plasma loops
Huang, G. -L.; Tan, B. -L.
From the similarities in magnetic configurations and plasma behaviors between tokamaks and solar current-carrying plasma loops, we apply the theory of neoclassical bootstrap current in tokamaks to the solar plasma loops. We present a simplified expression of the bootstrap current in the solar plasma loops and find that there may be a considerable …
The magnetic Bp star 36 Lyncis. II. A spectroscopic analysis of its co-rotating disk
Smith, M. A.; Wade, G. A.; Bohlender, D. A. +1 more
We report on the physical properties of the disk-like structure of B8 IIIp star 36 Lyncis from line syntheses of phase-resolved, high resolution spectra obtained from the International Ultraviolet Explorer archives and from newly obtained ground-based spectra of the Hα absorption profile. This disk is highly inclined to the rotational axis and bet…
A prominent relativistic iron line in the Seyfert 1 MCG-02-14-009
Porquet, D.
I report the discovery of a prominent broad and asymmetrical feature near 6.4 keV in the Seyfert 1
SOHO/CDS observations of waves above the network
Curdt, W.; Rybák, J.; Gömöry, P. +2 more
We analyze temporal variations in the intensities and the Doppler shifts of He i 584.33 Å (chromosphere), O v 629.73 Å (transition region), and Mg ix 368.07 Å (corona) measured in and above chromospheric network near disk center with the Coronal Diagnostic Spectrometer (CDS) onboard the Solar and Heliospheric Observatory (SOHO). There is significa…
Encounters of the dust trails of comet 45P/Honda-Mrkos-Pajdusakova with Venus in 2006
Christou, A. A.; Vaubaillon, J.
Aims.We aim to investigate the dynamical fate of meteoroids ejected during past perihelion passages of comet 45P/Honda-Mrkos-Pajdusakova that intersect the orbit of Venus. Of particular interest is the possibility, borne of previous work, that a significant flux of these particles will reach the planet during early June and late August 2006, when …
A 110 MG cyclotron harmonic in the optical spectrum of RX J1554.2+2721
Szkody, P.; Schreiber, M. R.; Schwope, A. D.
We report the detection of a 110 MG cyclotron harmonic in the SDSS-spectrum of the magnetic cataclysmic variable (MCV) RX J1554.2+2721. This feature was noted earlier by others but remained unexplained. The wide spectral coverage of the new spectrum together with the earlier detection of a Zeeman split Lyα line in a field of 144 MG makes the ident…
Identification of a new short-period comet near the sun
Hönig, S. F.
We present the identification of comet C/1999 R1 (SOHO) with comet C/2003 R5 (SOHO). Both apparitions were only observed with the Solar and Heliospheric Observatory (SOHO) at distances smaller than 0.1 AU from the sun with the LASCO coronagraphs onboard the spacecraft. Although SOHO comets usually have poor orbital coverage, the 1999 and 2003 arcs…
A statistical study of SUMER spectral images: events, turbulence, and intermittency
Vial, J. -C.; Lemaire, P.; Buchlin, E.
We analyze a series of full-Sun observations performed with the SoHO/SUMER instrument between March and October 1996. Some parameters (radiance, shift and width) of the S vi 93.3 nm , S vi 94.4 nm , and Ly \varepsilon line profiles were computed on board. Radiances and line-of-sight velocities in a large central region of the Sun are studied stati…