Results 11 to 20 of about 111 (106)
The SUMER Data in the SOHO Archive [PDF]
Solar Physics, 2013 38 pages, 9 figures, accepted for publication by Solar ...
Germerott, Dietmar +7 more
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SOHO/SUMER observations of prominence oscillation before eruption [PDF]
Astronomy & Astrophysics, 2008 Coronal mass ejections (CMEs), as a large-scale eruptive phenomenon, often reveal some precursors in the initiation phase, e.g., X-ray brightening, filament darkening, etc, which are useful for CME modeling and space weather forecast. With the SOHO/SUMER spectroscopic observations of the 2000 September 26 event, we propose another precursor for CME ...
Chen, P., Innes, D., Solanki, S.
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Spectroscopic Signatures of a Flare Observed by SUMER Onboard SOHO [PDF]
Symposium - International Astronomical Union, 2001 We report on EUV observations of a solar limb flare obtained by the SUMER spectrometer. A time series was taken with fixed slit position and several spectral windows that covered a wide temperature range (104-107 K), preceded and followed by contextual raster scans in a He I line. During the time series, a C4.6 flare occurred in the region, also imaged
Dammasch, I. +4 more
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A study of opacity in SOHO-SUMER and SOHO-CDS spectral observations [PDF]
Astronomy & Astrophysics, 2002 The assumptions underpinning escape probability and absorption factor methods for describing spectral emission from optically thick plasmas, are addressed to test the range of validity of the associated expressions and to develop them for use within non-stratified atmospheres which include plasma flow and line blending.
Fischbacher, G.A. +2 more
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Time series study of EUV spicules observed by SUMER/SoHO [PDF]
Astronomy & Astrophysics, 2005 Here we study the dynamic properties of EUV spicules seen at the solar limb. The selected data were obtained as time series in polar coronal holes by SUMER/SoHO. The short exposure time and the almost fixed position of the spectrometer's slit allow the analysis of spicule properties such as occurrence, lifetime and Doppler velocity.
Xia, L.D. +3 more
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SOHO/SUMER Results: Mass Flows [PDF]
Symposium - International Astronomical Union, 2004 Hardly any part of the chromosphere and the low corona of the Sun is in a static state. Spectrographs reveal line shifts and nonthermal broadening indicating mass supply to the corona, draining of coronal material, syphon flows, wave propagation and more.
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Near‐Earth Solar Wind Speed of Fast Coronal Mass Ejections
Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.Abstract Using solar wind and ground magnetometer data for solar cycles 23–25, extreme‐value power‐law models are developed that quantify relationships between near‐Earth solar wind speed and Sun‐to‐Earth transit times of interplanetary coronal mass ejections (ICMEs).
Jeffrey J. Love +3 more
wiley +1 more source
Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.Abstract Precise characterization of the electron density profile is crucial for optimizing high frequency communications. Reconstruction models often assume an instantaneous ionospheric response to solar forcing or using time delays, neglecting the time‐integrated cumulative “memory effect” of plasma dynamics.
Hongwei Gong +9 more
wiley +1 more source
The UK Met Office’s Coronal Mass Ejection (CME) Ensemble Prediction System
Space Weather, Volume 24, Issue 7, July 2026.Abstract We describe the 24‐member Coronal Mass Ejection (CME) ensemble prediction system that is used operationally at the UK's Met Office Space Weather Operations Center (MOSWOC) to forecast the arrival time of CMEs at Earth. The ensemble system was built on ad‐hoc assumptions and there is the need to investigate whether the technique can be improved
Siegfried Gonzi +8 more
wiley +1 more source
Determination of the 3D structure of an EUV-filament observed by SoHO/CDS, SoHO/SUMER and VTT/MSDP [PDF]
Astronomy & Astrophysics, 2004 Heinzel et al. (2001) found that filaments seem to be much more extended in EUV spectral lines than in Hα. In this paper we reconstruct the 3D structure of the extensions of the EUV-filament observed on 15 October 1999 by SoHO/CDS and SoHO/SUMER. Small Ha structures were observed by VTT/MSDP.
Schwartz, P. +3 more
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