Zobrazeno 1 - 10
of 129
pro vyhledávání: '"O. Kjeldseth-Moe"'
Autor:
O. Kjeldseth-Moe, Sven Wedemeyer-Böhm
Publikováno v:
Proceedings of the International Astronomical Union. 5:320-325
We have analyzed the record of Earth's global temperature variations between 1850 and 2007 looking for signals of periodic variations and compared our results with solar activity variations in the same time period. Significant periods are found at 9.
Publikováno v:
Solar Physics. 221:237-260
The results of simultaneous observations of oscillations in the chromosphere, transition region, and corona above nine sunspots are presented. The data are obtained through coordinated observing with the Solar and Heliospheric Observatory — SOHO an
Publikováno v:
Advances in Space Research. 32:1097-1102
We have recently observed thirteen sunspots, both with CDS on SOHO and TRACE. For each sunspot we investigate the oscillations in the chromosphere, transition region and corona. Above the umbra the power spectra show one dominant peak corresponding t
Publikováno v:
Astronomy & Astrophysics. 398:L15-L18
We explore a new approach to the investigation of optically thin emission lines by comparing the intensity variations in opposite wings of the spectral lines and apply the method to investigate the oscillations above sunspots. The observations show t
Autor:
T. Fredvik, Stein Vidar Hagfors Haugan, Joseph B. Gurman, O. Kjeldseth-Moe, P. Brekke, Klaus Wilhelm
Publikováno v:
Advances in Space Research. 30:635-640
A set of 218 consecutive CDS rasters taken at the solar limb on October 26–28 1999 has been used to investigate the variability and plasma dynamics of active region loops. Each raster contains simultaneous images in 6 different lines, covering the
Publikováno v:
Solar Physics. 207:259-290
The 3-min oscillations in the sunspot atmosphere are discussed, based on joint observing with the Transition Region and Coronal Explorer – TRACE and the Solar and Heliospheric Observatory – SOHO. We find that the oscillation amplitude above the u
Publikováno v:
Advances in Space Research. 30:529-534
The non-uniform spatial distributions of emission and wavelength shift in ten EUV lines formed in the chromosphere, transition region and corona above 50 sunspots are investigated, based on observations with the Coronal Diagnostic Spectrometer on the
Publikováno v:
Astronomy & Astrophysics. 373:L1-L4
The suggestion that sunspot transition region oscillations are a typical feature of the sunspot plumes is examined. The present observations show 3 min oscillations in the umbra that end at the umbral rim. We nd that sunspot plumes located above the
Publikováno v:
The Astrophysical Journal. 552:L77-L80
New knowledge about sunspot transition region lines that deviate significantly from a Gaussian shape are presented. Attention is given to "multiple flows," a line profile phenomenon in which two or more distinct velocities are observed within the sam
Publikováno v:
Solar Physics. 198:89-131
It is well known that sunspots are dark. This statement is not correct in the sunspot atmosphere between the chromosphere and the corona, where sunspots often are brighter than their surroundings. The brightest feature in the sunspot transition regio