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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic field measurements based on the Zeeman splitting of forbidden transitions (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 855-856 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The measurement of the poloidal magnetic field in a tokamak plasma from the Zeeman splitting and polarization of the magnetic dipole radiation from heavy ions is discussed. When viewed from a direction perpendicular to the toroidal field, the effect of the poloidal field on the circularly polarized radiation is detectable using a photoelectric polarimeter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138071
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  • 2
    Electronic Resource
    Electronic Resource
    Solar Convection (1990)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Astronomy and Astrophysics 28 (1990), S. 263-303 
    Details
    ISSN: 0066-4146
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.aa.28.090190.001403
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  • 3
    Electronic Resource
    Electronic Resource
    The SOUP and CIP instruments
    Amsterdam : Elsevier
    Advances in Space Research 4 (1984), S. 67-74 
    Details
    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
    URL: http://linkinghub.elsevier.com/retrieve/pii/0273-1177(84)90368-5
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  • 4
    Electronic Resource
    Electronic Resource
    Vortex flow in the solar photosphere (1988)
    [s.l.] : Nature Publishing Group
    Nature 335 (1988), S. 238-240 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The vortex we observed had a diameter of ~ 5,000 km (about three granulation cells), an average circulation of 4,000 km s"1, and a central vorticity of 1,400 s"1. This vorticity is an order of magnitude larger than seen in previous measurements from the Solar Optical Universal Polarimeter (SOUP) ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/335238a0
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  • 5
    Electronic Resource
    Electronic Resource
    Polar observatories (1988)
    [s.l.] : Nature Publishing Group
    Nature 334 (1988), S. 466-466 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-Dreadco's daring projects as described in your journal's weekly column Daedalus have stimulated our imagination. An endeavour that would be of the greatest importance for the astronomical community has occurred to us. In spite of Dreadco's reputation, we do not hesitate to mention it in this ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/334466b0
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  • 6
    Electronic Resource
    Electronic Resource
    Large-scale coronal heating by the small-scale magnetic field of the Sun (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 394 (1998), S. 152-154 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Magnetic fields play a crucial role in heating the outer atmospheres of the Sun and Sun-like stars, but the mechanisms by which magnetic energy in the photosphere is converted to thermal energy in the corona remain unclear. Observations show that magnetic fields emerge onto the solar surface as ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/28108
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  • 7
    Electronic Resource
    Electronic Resource
    Trace — The transition region and coronal explorer (1994)
    Springer
    Space science reviews 70 (1994), S. 119-122 
    Details
    ISSN: 1572-9672
    Keywords: Sun ; Instrumentation ; Coronal Heating ; Coronal Structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract TRACE is a single-instrument solar mission that will be put into a Sunsynchronous polar orbit and will obtain continuous solar observations for about 8 months per year. It will collect images of solar plasmas at temperatures from 104 to 107 K, with 1-arcsec spatial resolution and excellent temporal resolution and continuity. With such data, we expect to gain a new understanding of many solar and stellar problems ranging from coronal heating to impulsive magnetohydrodynamic phenomena.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00777855
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  • 8
    Electronic Resource
    Electronic Resource
    TIME-DISTANCE HELIOSEISMOLOGY WITH THE MDI INSTRUMENT: INITIAL RESULTS (1997)
    Springer
    Solar physics 170 (1997), S. 63-73 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In time-distance helioseismology, the travel time of acoustic waves is measured between various points on the solar surface. To some approximation, the waves can be considered to follow ray paths that depend only on a mean solar model, with the curvature of the ray paths being caused by the increasing sound speed with depth below the surface. The travel time is affected by various inhomogeneities along the ray path, including flows, temperature inhomogeneities, and magnetic fields. By measuring a large number of times between different locations and using an inversion method, it is possible to construct 3-dimensional maps of the subsurface inhomogeneities. The SOI/MDI experiment on SOHO has several unique capabilities for time-distance helioseismology. The great stability of the images observed without benefit of an intervening atmosphere is quite striking. It has made it possible for us to detect the travel time for separations of points as small as 2.4 Mm in the high-resolution mode of MDI (0.6 arc sec pixel-1). This has enabled the detection of the supergranulation flow. Coupled with the inversion technique, we can now study the 3-dimensional evolution of the flows near the solar surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004907220393
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  • 9
    Electronic Resource
    Electronic Resource
    On the feasibility of correlation tracking at moderate resolution (1988)
    Springer
    Solar physics 116 (1988), S. 205-214 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The SOUP experiment demonstrated that photospheric surface flows can be measured by correlation tracking of white-light intensity features at high resolution (November et al., 1987). In order to assess the feasibility of this technique with observations made at lower resolution, we have applied it to the same SOUP data artificially degraded, but still free of seeing distortion. Comparison with the velocity structures inferred from the original data shows generally good agreement when the resolution is better than about 2″. The radial outflow from a sunspot penumbra, however, can only be seen with resolution of better than 1″. With resolution of worse than 2″, the inferred velocity fields rapidly lose coherence, while resolution of better than 1″ yields little improvement. We conclude that apertures as small as 10–14 cm on a space-based platform will be useful for the measurement of large-scale horizontal motions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00157473
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  • 10
    Electronic Resource
    Electronic Resource
    The Solar Oscillations Investigation - Michelson Doppler Imager (1995)
    Springer
    Solar physics 162 (1995), S. 129-188 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Solar Oscillations Investigation (SOI) uses the Michelson Doppler Imager (MDI) instrument to probe the interior of the Sun by measuring the photospheric manifestations of solar oscillations. Characteristics of the modes reveal the static and dynamic properties of the convection zone and core. Knowledge of these properties will improve our understanding of the solar cycle and of stellar evolution. Other photospheric observations will contribute to our knowledge of the solar magnetic field and surface motions. The investigation consists of coordinated efforts by several teams pursuing specific scientific objectives. The instrument images the Sun on a 10242 CCD camera through a series of increasingly narrow spectral filters. The final elements, a pair of tunable Michelson interferometers, enable MDI to record filtergrams with a FWHM bandwidth of 94 mÅ. Normally 20 images centered at 5 wavelengths near the Ni I 6768 spectral line are recorded each minute. MDI calculates velocity and continuum intensity from the filtergrams with a resolution of 4″ over the whole disk. An extensive calibration program has verified the end-to-end performance of the instrument. To provide continuous observations of the longest-lived modes that reveal the internal structure of the Sun, a carefully-selected set of spatial averages are computed and downlinked at all times. About half the time MDI will also be able to downlink complete velocity and intensity images each minute. This high rate telemetry (HRT) coverage is available for at least a continuous 60-day interval each year and for 8 hours each day during the rest of the year. During the 8-hour HRT intervals, 10 of the exposures each minute can be programmed for other observations, such as measurements in MDI's higher resolution (1.25″) field centered about 160″ north of the equator; meanwhile, the continuous structure program proceeds during the other half minute. Several times each day, polarizers will be inserted to measure the line-of-sight magnetic field. MDI operations will be scheduled well in advance and will vary only during the daily 8-hour campaigns. Quick-look and summary data, including magnetograms, will be processed immediately. Most high-rate data will be delivered only by mail to the SOI Science Support Center (SSSC) at Stanford, where a processing pipeline will produce 3 Terabytes of calibrated data products each year. These data products will be analyzed using the SSSC and the distributed resources of the co-investigators. The data will be available for collaborative investigations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00733429
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