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  • 1
    Electronic Resource
    Electronic Resource
    Solar Photospheric and Chromospheric Observations using a Lithium Niobate Fabry-Perot Etalon (1998)
    Springer
    Experimental astronomy 8 (1998), S. 125-133 
    Details
    ISSN: 1572-9508
    Keywords: Fabry-Perot filter ; Solar instrument ; Lithium niobate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have made a narrow band tunable filter for solar observations using a Lithium Niobate Fabry-Perot etalon. The 60 mm aperture etalon with a free spectral range of 4.22 Å and finesse of 26 at λ = 6122 Å has been procured from CSIRO, Australia. The wavelength tuning is achieved by applying high voltage to the etalon substrate at the rate of 0.45 Å per 1000 Volts. The filter is being used for imaging the sun in Hα line and obtaining Doppler- and Magnetogram in CaI 6122 Å line. In this paper, we present some initial observations carried out with this filter at Udaipur Solar Observatory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007927214812
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A Digital Imaging Multi-Slit Spectrograph for Measurement of Line-of-Sight Velocities on the sun (1999)
    Springer
    Solar physics 185 (1999), S. 61-68 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A multi-slit digital imaging spectrograph has been installed at Udaipur Solar Observatory, Udaipur (India) to measure the line-of-sight velocities in Hα associated with the mass motions of the dynamic phenomena on the solar surface viz. solar flares, eruptive prominences and surges. This spectrograph is being used in conjunction with a 15 cm aperture Coudé telescope to obtain the Hα spectra at a high rate of a specific region of interest on the Sun. In this paper, we describe the principal features of this instrument and the data acquisition method. We also present spectral observations of a surge and a quiescent prominence recorded using this instrument.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005189319845
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic field gradient and flare: study of a small flare in NOAA 8038 (2000)
    Springer
    Solar physics 197 (2000), S. 75-84 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Active region NOAA 8038 was observed from 10 to 13 May, 1997 using the USO solar video magnetograph. During this period, the active region was mostly inactive, and gave rise to only a single notable flare of 1N/C1.3 class on May 12, 1997/04:45 UT. The flare occurred in a weak field location, but new emerging fluxes were observed prior to the flare onset. Horizontal motions of the network photospheric magnetic fluxes were inferred using USO and SOHO magnetograms, and velocities in the range 300–800 m s−1 were estimated. The initial flare brightening was observed at the flux cancellation site where magnetic field gradients were found to increase. Detailed analyses of flux motions, cancellation and their relation with the flare are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026568430463
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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