Search Publications
Starspot and Chromospheric Activity of lambda And in 1978--1995
Glebocki, R.; Sikorski, J.
UBV photometry and UV spectra from the IUE satellite are analyzed for search of relation between photospheric and chromospheric activity in lambda And. We find no correlation between intensity variations of chromospheric and TR emissions and visibility of spots. Intensities of TR lines are proportional to the MgII emissions. UV continuum follows f…
Cool gaze at heartless galaxies
Gilmore, Gerry
The Ulysses mission: an introduction.
Smith, E. J.; Marsden, R. G.
On 30 September 1995, Ulysses completed its initial, highly successful, survey of the polar regions of the heliosphere in both southern and northern hemispheres, thereby fulfilling its prime mission. The results obtained to date are leading to a revision of many earlier ideas concerning the solar wind and the heliosphere. Now embarking on the seco…
Ulysses observations of corotation lags in the dayside Jovian magnetosphere: An evaluation of the hinged magnetodisc and magnetic anomaly models
Dougherty, Michele K.; Phillips, John L.; Hoogeveen, Gary W.
Ulysses observations during the inbound leg of the February 1992 encounter with Jupiter offer the opportunity to evaluate both the hinged magnetodisc and the magnetic anomaly models currently used to describe the Jovian magnetospheric corotation lag. Particle and field detectors on board Ulysses measure signatures of the current and plasma sheets.…
Numerical simulations of non-adiabatic particle motions in the Jovian magnetosphere; comparisons with Ulysses observations
Keppler, E.; Korth, A.; Quenby, J. J. +3 more
The Ulysses encounter with Jupiter gave a unique opportunity for the study of ions in the Jovian day side in the range 0.3 < ( E/nuc) < 6 MeV. The EPAC experiment has already provided a wealth of interesting results concerning the composition and the anisotropies in the magnetosphere (Krupp et al., Planet. Space Sci.41, 953, 1993), however a…
Plasma diagnostics for SUMER on board the SOHO mission
Dwivedi, B. N.
Astrometry in the Future
Seidelmann, P. K.
The introduction of the extragalactic reference frame and the availability of the Hipparcos and Tycho catalogs will have major impacts on changing the accuracy levels of astrometry in the future. There is a need for accurate densification of the reference frames down to at least 20th magnitude, Also accurate space motions and distances …
The case of the fastest stellar wind in central stars of planetary nebulae
Perinotto, Mario; Patriarchi, Patrizio
An exceptionally fast wind (8500 km/s) was suggested to occur in the central star of the planetary nebula K1-16, belonging to the class of the PG 1159 H-deficient pre-white dwarfs. To ascertain the reality of such a fast wind this star has been observed with the HST telescope using the GHRS in the zone of theCIV 155.0 nm doublet. The HST data and …
Coronal transport and storage of energetic particles
Simnett, G. M.
There is increasing evidence that regions of the corona or the inner heliosphere sometimes impede the escape of energetic particles accelerated at the Sun. Certain impulsive radio, X- and gamma-ray emissions indicate times at which major particle acceleration has recently occurred. The more gradual emissions are harder to interpret, and may reflec…
Enhancing the Spatial Resolution of Solar Coronagraph Observations Using Dynamic Imaging
Schwenn, R.; Howard, R. A.; Karovska, M. +4 more
The Large Angle Spectrometric Coronagraph (LASCO) Cl coronagraph on board the Solar and Heliospheric Observatory (SOHO) is designed to image the corona from 1.1 to 3.0 Rsun. The resolution of C1 is defined by the size of its CCD pixels, which correspond to 5".6, and not by the diffraction limit of the optical system, which may be as sma…