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Close Approaches of Stars to the Solar System Based on Hipparcos Data
García-Sánchez, Joan
On the Sources of Jovian Hectometric Radiation
Misawa, H.; Morioka, A.; Nakagawa, F.
Jovian hectometric radiation(HOM) emitted from the polar region of the Jovian magnetsphere reflects the information on the electro-magnetic environment of the source region. Using the Ulysses URAP and SWOOPS data, the occurrence characteristics of HOM and its relation to the solar wind were investigated. As a result, we found that HOM can be class…
Temporal Variations of the White Dwarf and Disk in OY Carinae Following the 1992 Superoutburst
Horne, Keith; Marsh, T. R.; Sion, E. M. +2 more
Hubble Space Telescope observations of the eclipsing dwarf nova OY Carinae after its 1992 April superoutburst are used to isolate ultraviolet spectra (1150-2500 Å at 9.2 Å FWHM resolution) of the white dwarf, the accretion disk, and the bright spot. The white dwarf spectra have a Stark-broadened photospheric Lyα absorption feature but are veiled b…
Electron density diagnostics for solar ultraviolet lines of O V
Doyle, J. G.; Keenan, F. P.; O'Shea, E. +1 more
We determine the electron densities for a range of solar features using new calculations for the O v line ratio, R=I(λ761.1)/I(λ760.4), in conjunction with observational data obtained with the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) instrument on the Solar and Heliospheric Observatory (SOHO). The densities obtained from this di…
Modelling Transient Effects in the IR Array of the Short Wavelength Channel of ISOCAM
Rouan, D.; Epstein, G.; Tiphène, D. +1 more
The short-wave channel (SW) of ISOCAM, the IR camera on board the ISO satellite, is equipped with a 32 × 32 CID InSb array. This array shares with other detectors of ISO instruments the characteristic of being subject to some time lag when responding to a flux variation. Known as transient effect, this default which is not quite understood (in par…
Study of CME Structure and Evolution Deduced from Ulysses/Hi-Scale Energetic Particle Observations
Malandraki, O.; Sidiropoulos, N.; Saris, E. T. +1 more
In this work, we study the anisotropy characteristics of solar energetic electron (E > 53 keV) fluxes observed by the ULYSSES/HI-SCALE instrument during the passage of a well-identified Coronal Mass Ejection. On the basis of the energetic electron observations, firm conclusions are drawn on whether the detected Coronal Mass Ejection has been de…
Dynamics of the transition region
Gontikakis, C.; Dara, H. C.
In this review, we consider the problem of the apparent redshifts of the UV lines in the transition region and review the basic observations made over the last decades, especially the observations of the last few years from satellite observatories. Moreover, we revise the most popular theoretical explanations for the motions in the transition regi…
Solar Irradiances of Ultraviolet Emission Lines Measured During the Minimum of Sunspot Activity in 1996 and 1997
Wilhelm, K.; Curdt, W.; Lemaire, P. +6 more
An Estimation of the Shape and Location of the Heliospheric Termination Shock
Moussas, X.; Exarhos, G.
We calculate semianalytically the distance to the heliospheric termination shock, and we use Ulysses measurements as data input for a realistic application. Therefore, we can find directly the consequences of the solar wind latitudinal variation on the shape of the termination shock. The model that we use is an approximate gasdynamic model. Our pu…
Glitch effects in ISOCAM Long Wave detector
Starck, J. -L.; Claret, A.; Dzitko, H. +1 more
One of the main limitations to the sensitivity of observations carried out with the ISOCAM infrared camera comes from the responsivity variations and glitches caused by impacts of charged particles. After more than 28 months of successful operations, the predicted glitch rate has been re-evaluated and compared to in-flight measurements. Glitch pro…