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  • Articles: DFG German National Licenses  (21)
  • 1995-1999  (9)
  • 1975-1979  (12)
Source
  • Articles: DFG German National Licenses  (21)
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    SOLAR ACTIVE REGIONS AS DIAGNOSTICS OF SUBSURFACE CONDITIONS (1996)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Astronomy and Astrophysics 34 (1996), S. 75-109 
    Details
    ISSN: 0066-4146
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Notes: Abstract In the past decade a number of observational and theoretical studies have appeared that address the problem of how both the physical conditions in subsurface layers of the Sun and the nature of the magnetic flux tubes of active regions are reflected in the structure and behavior of these regions at the surface. This review discusses work in this area. Many characteristics of plages and sunspot groups are shown to be related to the conditions encountered by the region flux tube as it rises through the convective zone of the Sun to the surface. Size distributions, rotation and meridional flow rates and their covariances, and characteristics of growth and decay are among the factors that have been shown to depend on the nature of the source magnetic flux tube and the physical effects, such as the Coriolis force and magnetic tension, that act deep in the convection zone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.astro.34.1.75
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    Paper (German National Licenses)
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  • 2
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    Unknown
    Behavioral contrast in a multiple schedule with topographically different responses in the components (1979)
    Provincetown, Mass., etc. : Periodicals Archive Online (PAO)
    Journal of General Psychology. 101 (1979:Oct.) 265 
    Details
    ISSN: 0022-1309
    Topics: Psychology
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:1128-1979-101-00-000025
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Tabulation of the harmonic coefficients of the solar magnetic fields (1975)
    Springer
    Solar physics 41 (1975), S. 225-226 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Tables of spherical harmonic coefficients for the global photospheric magnetic field between 1959 and 1974 are now available on microfilm. (These are the same coefficients which were used to construct the maps of the coronal magnetic atlas.)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00152968
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Studies of solar magnetic fields (1976)
    Springer
    Solar physics 47 (1976), S. 575-580 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In order to provide a smooth transition to a smaller aperture for the Mount Wilson daily magnetograms, a 2-step change was made, with two daily observations made using two different apertures covering an interval of several months. A comparison of these observations has made possible a check on the zero-level and calibration errors of the Mount Wilson magnetograph in recent years, and it has shown that an interval of low measured total magnetic flux resulted at least in part from an increase in the mixing of magnetic elements of the two polarities on a scale comparable with the aperture size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00154766
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The mean magnetic field of the Sun: Method of observation and relation to the interplanetary magnetic field (1977)
    Springer
    Solar physics 52 (1977), S. vi 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The mean solar magnetic field as measured in integrated light has been observed since 1968. Since 1970 it has been observed both at Hale Observatories and at the Crimean Astrophysical Observatory. The observing procedures at both observatories and their implications for mean field measurements are discussed. A comparison of the two sets of daily observations shows that similar results are obtained at both observatories. A comparison of the mean field with the interplanetary magnetic polarity shows that the IMF sector structure has the same pattern as the mean field polarity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00935783
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Open magnetic fields in active regions (1977)
    Springer
    Solar physics 55 (1977), S. 359-369 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Soft X-ray observations confirm that some of the dark gaps seen between interconnecting loops and inner cores of active regions may be loci of open fields, as it has been predicted by global potential extrapolation of photospheric magnetic fields. It seems that the field lines may open only in a later state of the active region development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00152579
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Transient brightenings of interconnecting loops (1979)
    Springer
    Solar physics 63 (1979), S. 297-318 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study sudden brightenings of coronal loops that interconnect active regions. Such brightenings often occur within one or two days after the birth of a new interconnecting loop, as well as in some old interconnections. The brightenings of young loops are obviously associated with the emergence of new magnetic flux near their footpoints, whereas some enhancements of old loops may be triggered by slowly moving disturbances propagating from other centers of activity. A few loop brightenings are associated with flares, but the loop does not brighten in consequence of energy supply from the flare. Both the flare and the loop brightening are independent consequences of one common agent, presumably newly emerging flux. Temperatures in brightened loops are between 3 and 4 × 106 K and densities are 〈 2 × 109 cm−3, probably 〈 5 × 108 cm−3 in some old loops. The top part of a loop is the site of the most intense brightening in the initial phase of a loop enhancement. The most frequent lifetime of these brightenings is 6 to 7 hr.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00174536
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Studies of solar magnetic fields (1977)
    Springer
    Solar physics 52 (1977), S. 243-248 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An estimate of the average magnetic field strength at the poles of the Sun from Mount Wilson measurements is made by comparing low latitude magnetic measurements in the same regions made near the center of the disk and near the limb. There is still some uncertainty because the orientation angle of the field lines in the meridional plane is unknown, but the most likely possibility is that the true average field strengths are about twice the measured values (0–2 G), with an absolute upper limit on the underestimation of the field strengths of about a factor 5. The measurements refer to latitudes below about 80°.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00149642
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetic field rotation at high solar latitudes (1978)
    Springer
    Solar physics 59 (1978), S. 243-248 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of the rotation rate of polar magnetic features during 1974–76 lead to a significantly slower rotation rate than that found earlier for polar faculae in 1951–54. Similarly, the rotation rate of these features is slower than the Doppler-determined rate at polar latitudes or the rotation rate of polar filaments. It is suggested that the strong latitude rotation gradient in the subsurface magnetic flux tubes which is implied by these results may presage a very active solar maximum for cycle 21.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00951832
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Latitude dependence of magnetic field-line inclinations (1995)
    Springer
    Solar physics 156 (1995), S. 29-39 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is shown that leading and following magnetic field lines are inclined toward each other by a few degrees at nearly all latitudes in both the north and south hemispheres. The amplitudes of these inclinations are lower by about a factor 3 for weak fields than for strong fields. There are significant differences between the hemispheres and from one activity cycle to the next in the leading and following polarity field-line inclinations at latitudes poleward of the activity latitudes. In a narrow latitude zone just south of the solar equator the inclinations of both the leading and following fields reduce to zero (or perhaps slightly negative values). Although one would expect such a zone at the equator, where diffusion will mix field lines with opposite inclinations from the two hemispheres, it is not clear why this zone should be on one side of the equator only. The results discussed here were obtained with Mount Wilson magnetograph data (1967–1992), and are confirmed in many respects with National Solar Observatory/Kitt Peak (NSO/KP) data (1976–1986).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00669573
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    Paper (German National Licenses)
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