Search Publications
First results from UVCS/SOHO
Romoli, M.; Raymond, J. C.; Naletto, G. +20 more
We present here the first results obtained by the Ultraviolet Coronagraph Spectrometer (UVCS) operating on board the SOHO satellite. The UVCS started to observe the extended corona at the end of January 1996; it routinely obtains coronal spectra in the 1145 A˚ - 1287 A˚, 984 A˚ - 1080 A˚ ranges, and intensity data in the visible continuum. Through…
SATI: a spectral airglow temperature imager
Rodrigo, R.; Wiens, R. H.; Moise, A. +6 more
An empirical understanding of planetary scale perturbations in the upper atmosphere is most effectively gained by the complementary use of both satellite and ground-based instrumentation. Limb observations from space provide vertical information and broad global coverage, while ground-based observations provide detailed system development in both …
Measurements of H I and O VI velocity distributions in the extended solar corona with UVCS/SOHO and UVCS/Spartan 201
Romoli, M.; Raymond, J. C.; Naletto, G. +23 more
The Ultraviolet Coronagraph Spectrometer on the Solar and Heliospheric Observatory, UVCS/SOHO, and the Ultraviolet Coronal Spectrometer on the Spartan 201 satellite, UVCS/Spartan, have been used to measure H I 1215.67 A˚ line profiles in polar coronal holes of the Sun at projected heliocentric heights between 1.5 and 3.0 R_solar. UVCS/SOHO also me…
Overview of the soho mission
Bonnet, R. M.; Felici, F.
The SOHO spacecraft was launched on 2 December 1995, some 8 years after it started to be developed by European industry. Since 14 February 1996, SOHO is in a halo orbit around the Lagrangian point L1. It is continuously in view of the Sun, allowing uninterrupted sequences of observations of our star, a first in the development of solar physics. It…
ERNE observations of energetic particle fluxes
Laitinen, T.; Vainio, R.; Valtonen, E. +7 more
The observations of the ERNE instrument on-board the SOHO spacecraft are analysed. The main period under study is from the beginning of May till mid-October 1996. Only very small energetic particle events were observed. A comparison of the ERNE measurements with energetic particle observations during the two previous solar minima indicates that th…
High resolution solar ultraviolet measurements
Vial, J. -C.; Wilhelm, K.; Curdt, W. +6 more
The increase of our understanding of the processes acting in the solar corona and maintaining it is strongly dependent on the quality of the data that are obtained to check theories. The fine structure of the solar atmosphere seen from the photosphere and extending to the hottest parts of the corona requires data with high resolution in all parame…
Interplanetary variability in particle fluxes recorded by the low energy charged particle detector lion (40 KEV-6 MEV) on the soho spacecraft during its cruise phase to the L1 point
Kunow, H.; Muller-Mellin, R.; McKenna-Lawlor, Susan M. P. +6 more
Representative types of energetic particle phenomena recorded by the LION instrument on SOHO during its Transfer Phase to, and while in early Halo Orbit about, the L1 Lagrangian Point are presented. The data cover the period from 7 December 1995 (instrument switch on) until 9/10 July 1996 (when a particle event associated with the first Class X fl…
Extreme ultraviolet observations of the solar corona: first results from the coronal diagnostic spectrometer on SOHO
Mason, H. E.; Harrison, R. A.; Culhane, J. L. +9 more
We present first results from the Coronal Diagnostic Spectrometer (CDS) aboard the ESA/NASA Solar and Heliospheric Observatory (SOHO). CDS is a double spectrometer operating in the 151-785 A˚ range. This region of the solar spectrum is rich in emission lines from trace elements in the solar atmosphere, which can be used to derive diagnostic inform…
Observational signatures of nanoflare heated solar stellar coronae
Judge, P. G.; Hansteen, V. H.; Wikstøl, Ø.
Using time-dependent dynamical models of the radiating gas in coronal flux tubes, we identify features in UV spectral line profiles that can reveal the direction in which energy flows through the solar transition region, in observations without temporal or spatial resolution. The profile features survive spatial and temporal averaging through non-…
IACG Campaign III: solar events and their manifestation in interplanetary space and in geospace
Harrison, R. A.
In Spring 1994 the Inter Agency Consultative Group Campaign III was set up at a kick-off meeting in Sagamihara, Japan. The basic idea of Campaign III was to coordinate solar, interplanetary and near-Earth spacecraft in an effort to link solar and near-Earth observations relating to activity such as solar mass ejections, and features such as co-rot…