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  • 1990-1994  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Flare path (1991)
    [s.l.] : Nature Publishing Group
    Nature 353 (1991), S. 204-204 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - In describing the Japanese Solar-A mission due for launch on 26 August 1991, to study solar flares (Nature 352, 96; 1991), David Swinbanks omitted to mention the substantial involvement of two British groups, University College London's Mullard Space Science Laboratory and the Space Science ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/353204c0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Yohkoh observations of the creation of high-temperature plasma in the flare of 16 December 1991 (1994)
    Springer
    Solar physics 153 (1994), S. 307-336 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Yohkoh observations of an impulsive solar flare which occurred on 16 December, 1991 are presented. This flare was a GOES M2.7 class event with a simple morphology indicative of a single flaring loop. X-ray images were taken with the Hard X-ray Telescope (HXT) and soft X-ray spectra were obtained with the Bragg Crystal Spectrometer (BCS) on board the satellite. The spectrometer observations were made at high sensivity from the earliest stages of the flare, are continued throughout the rise and decay phases, and indicate extremely strong blueshifts, which account for the majority of emission in Caxix during the initial phase of the flare. The data are compared with observations from other space and ground-based instruments. A balance calculation is performed which indicates that the energy contained in non-thermal electrons is sufficient to explain the high temperature plasma which fills the loop. The cooling of this plasma by thermal conduction is independently verified in a manner which indicates that the loop filling factor is close to 100%. The production of ‘superhot’ plasma in impulsive events is shown to differ in detail from the morphology and mechanisms appropriate for more gradual events.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00712508
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The Bragg Crystal Spectrometer for SOLAR-A (1991)
    Springer
    Solar physics 136 (1991), S. 89-104 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Bragg Crystal Spectrometer (BCS) is one of the instruments which makes up the scientific payload of the SOLAR-A mission. The spectrometer employs four bent germanium crystals, views the whole Sun and observes the resonance line complexes of H-like Fexxvi and He-like Fexxv, Caxix, and Sxv in four narrow wavelength ranges with a resolving power (λ/Δλ) of between 3000 and 6000. The spectrometer has approaching ten times better sensitivity than that of previous instruments thus permitting a time resolution of better than 1 s to be achieved. The principal aim is the measurement of the properties of the 10 to 50 million K plasma created in solar flares with special emphasis on the heating and dynamics of the plasma during the impulsive phase. This paper summarizes the scientific objectives of the BCS and describes the design, characteristics, and performance of the spectrometers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151696
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    Paper (German National Licenses)
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