Search Publications
Beginning of the super-soft phase of the classical nova V2491 Cygni
Ness, J. -U.; Takei, D.
We present the results of soft X-ray studies of the classical nova V2491 Cygni using the Suzaku observatory. On day 29 after outburst, a soft X-ray component with a peak at ∼0.5 keV has appeared, which is tantalising evidence for the beginning of the super-soft X-ray emission phase. We show that an absorbed blackbody model can describe the observe…
Review of Hinode results
Suematsu, Y.
Hinode is an observatory-style satellite, carrying three advanced instruments being designed and built to work together to explore the physical coupling between the photosphere and the upper layers for understanding the mechanism of dynamics and heating. The three instruments aboard are the Solar Optical Telescope (SOT), which can provide high-pre…
Advances in solar rotation rate inferences: Unstructured grid inversions and improved rotational splittings
Eff-Darwich, A.; Korzennik, S. G.; García, R. A.
We present a new inversion methodology that adapts the inversion grid in both radius and co-latitude to the data set and solves the inversion problem through an iterative procedure. This method was tested on state-of-the-art global mode frequency splittings to assess the solar interior rotation rate and its temporal variation. We also explore the …
SSS in young stellar populations and the ``prompt" component of Type Ia supernovae
Nelson, T.; Orio, M.; Di Mille, F.
We present the results of a search for UV and optical counterparts of the SSS population in M 31. We find that out of the 56 sources we included in our search, 16 are associated with regions of ongoing or recent star formation. We discuss two particularly interesting sources that are identified optically as early type stars, one of which displayed…
The acoustic and magnetic solar cycle
Komm, R.
The frequency variation of global modes provides information about the solar structure and the rotation rate of the solar interior. The solar-cycle variation of the rotation rate, the so-called torsional oscillation, extends throughout the convection zone. Alternating bands of faster- and slower-than-average rotation move from mid-latitudes toward…
Probability distribution functions for the Sun's magnetic field
Stenflo, J. O.
Magnetoconvection structures the Sun's magnetic field cover a vast range of scales, down to the magnetic diffusion scale that is orders of magnitude smaller than the resolution of current telescopes. The statistical properties of this structuring are governed by probability density functions (PDFs) for the flux densities and by the angular distrib…
Observational results from active region seismology
González Hernández, I.
Active regions are one of the most observed features in the solar surface. High-resolution solar telescopes on ground and space have revealed the fine configuration of umbra and penumbra of sunspots with amazing detail. However, the subsurface structure of sunspots and active regions remains, for the most part, unknown. Thanks to the development o…