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EUV Spectroscopy of the Sunspot Region NOAA 7981 Using SOHO - I. Line Emission and Time Dependence
Harrison, R. A.; Wilhelm, K.; Fredvik, T. +8 more
EUV spectra of a medium-size sunspot and its surroundings, NOAA 7981, were obtained on 2 August 1996 with the Coronal Diagnostic Spectrometer (CDS) and the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) on the Solar and Heliospheric Observatory (SOHO). The spectral lines formed in the transition region and corona show considerable str…
Physical properties of the quiescent prominence of 5June 1996, from Hα observations
Schmieder, B.; Roudier, Th.; Malherbe, J. -M. +2 more
The Multichannel Subtractive Double Pass spectrograph (MSDP) is designed to observe line profiles in a 2D field of view with a good spatial and temporal resolution. In order to deal with this unique opportunity, we introduce a new method for fitting the hydrogen Hα line formed in prominences and deriving various plasma parameters from line profile…
The Search for Solar Gravity-Mode Oscillations in the Solar Wind Using it Ulysses Plasma Data
Riley, Pete; Hoogeveen, Gary W.
A recent report that energetic particles measured in the solar wind may be influenced by solar gravity-mode (-mode) oscillations motivated the search for -mode signatures in the Ulysses solar wind plasma data. Ulysses solar wind plasma data from 1 March 1992 through the 12 April 1996 were examined in this study for signs of possible solar oscillat…
EUV Full-Sun Imaging and Pointing Calibration of the SOHO Coronal Diagnostic Spectrometer
Thompson, William; Carter, Martin
Although the field of view of the Normal Incidence Spectrometer (NIS) of the Coronal Diagnostic Spectrometer (CDS) is 4×4 arc min, it is possible to observe the full solar disk by forming a mosaic of images taken in succession. This paper describes just such a study which has been used to collect images of the Sun simultaneously in six wavelengths…
Ultraviolet Observations of a Dynamic Event in the Solar Corona
Dwivedi, B. N.; Wilhelm, K.; Curdt, W. +1 more
The Solar Ultraviolet Measurements of Emitted Radiation instrument (SUMER) observations show high Doppler shifts and temporal variations in profiles of ultraviolet lines from low temperature gas in the corona above the active region NOAA 7974. The profiles indicate ≈ 100 km s-1 flows coming from an almost stationary source that appears …
Visualization of three-dimensional datasets
Walsh, Robert W.; Ireland, Jack; Galsgaard, Klaus
The effective visualization of three-dimensional (3d) datasets, both observationally and computationally derived, is an increasing problem in solar physics. We present here plots of computational data derived from the 3d reconstruction of the magnetic field of a loop system, rendered as anaglyphs. By combining images of the same 3d object from two…