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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Solar physics 89 (1983), S. 355-378 
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The paper is a contribution to the study of two-ribbon flares. A variety of observational material, i.e. Hα pictures, radio spectrum in the frequency band of 150–1000 MHz, radio map at 6 cm, fluxes at other frequencies, magnetograms and X-ray flux in a broad energy interval, enabled us to study the development of the 16 May, 1981 flare. The onset of the flare could be described by the model of Van Tend and Kuperus. A diminishing of the magnetic shear during the activation of the filament was observed. From radio and X-ray data it was found that pulsed acceleration took place in the region under the rising filament, the electrons propagating in a limited region both upwards to greater heights and downwards into the footpoints. Internal oscillations of the filament were observed. A manifestation of the primary process of interplanetary shock-wave generation was found. The 6 cm radio sources could be localized in the footpoints of magnetic loops.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Solar physics 183 (1998), S. 339-357 
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The goal of this study is to improve our knowledge of the spatial relation between pre-flare and flare X-ray sources, to find other connections between the two phenomena (if they exist) and to study the role of pre-flare heating in flare build-up. We selected all flares with available preflare data observed by Yohkoh during the period October 1993–October 1994 and thus created a data base of 32 flares. When studying the spatial relation we discovered that our events can be classified into 3 categories: Co-spatial, Adjacent/Overlapping and Distant according to the spatial separation between the pre-flare and flare source(s) in the same field of view. The 'Co-spatial’ class of events, of which we found 8 cases, refers to flares that had a visible pre-flare soft X-ray structure with the same size, shape, and orientation as the main flare loops at the flare site at least 5 min before the start of the impulsive phase. We suggest that this is strong evidence that for a significant number of flares the flare structure is active in soft X-rays several minutes or more before the flare begins. However, an analysis of the physical properties of the flare sites, including temperature and intensity variation found no consistent feature distinguishable from other non-flaring active region emission and hence no definite evidence of a special 'pre-flare’ or 'precursor’ phase in solar flares.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Solar physics 187 (1999), S. 33-44 
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study two long transequatorial loops connecting high-latitude regions of the new solar cycle. These loops (with lengths of 47 and 61 heliographic degrees) provide evidence that the upper length limit of 37° found by Chase et al. (1976) from Skylab data was determined simply by the typical distances between northern and southern active regions during the period of Skylab observations. We find strong support for the idea that these long interconnecting loops originate through reconnection of field lines extending from the two active regions towards and beyond the equator, and confirm the earlier finding by Canfield, Pevtsov, and McClymont (1996) that only field lines from active regions with the same chirality reconnect. As we are not aware of any longitudinal (E–W) loops of comparable lengths, we suggest that it is mainly the solar differential rotation which drives the reconnection of latitudinal (N–S) field lines.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Solar physics 197 (2000), S. 337-360 
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We describe the RF15-I instrument, comprising a solar photometer and an imager, designed for multi-band high-time resolution measurements of integral solar fluxes in the energy range between 2 keV and 240 keV as well as for imaging of solar flares in the 2–8 keV energy range. The instrument was launched in August 1995 aboard the INTERBALL–Tail spacecraft. Description of the construction and operations is presented. The overall performance and the high sensitivity of the photometer are shown in examples. The X-ray tomograph-imager contains a unique rotationally modulated collimator. It provides sets of one-dimensional scans of flares taken at varying angles due to spinning of the satellite. We present principles of the algorithm for imaging from these data and show example of reconstructed flare image taken in the 2–4 keV range.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Solar physics 153 (1994), S. 19-31 
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Team 2 of the Ottawa FLARES 22 Workshop dealt with observational and theoretical aspects of the characteristics and processes of energy release in flares. Main results summarized in this article stress the global character of the flaring phenomenon in active regions, the importance of discontinuities in magnetic connectivity, the role of field-aligned currents in free energy storage, and the fragmentation of energy release in time and space.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Planetary and Space Science 39 (1991), S. 15-22 
    ISSN: 0032-0633
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Planetary and Space Science 39 (1991), S. 1-5 
    ISSN: 0032-0633
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Advances in Space Research 8 (1988), S. 267-270 
    ISSN: 0273-1177
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
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