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  • SOLAR PHYSICS  (5)
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  • 1
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    Dependence of radio emission in large H alpha flares 1967-1970 upon the orientation of the local solar magnetic field (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Published data on ionizing radiation (as reflected in sudden ionospheric disturbances), H-alpha importance, 10-cm flux, dynamic spectrum, and 200-MHz flux are analyzed for a group of 84 solar flares (from 1967 to 1970) classified by Pudovkin and Chertkov (1976). The group consists of 29 flares with southern orientation of the 100,000-km-scale overlying magnetic field, 32 with northern orientation, and 23 with indeterminate orientation; all have H-alpha importance greater than about 2. Slightly greater X-ray and optical emissions, but one-order-of-magnitude greater prompt 200-MHz and 10-cm fluxes are found in southern as compared to northern-oriented flares. It is inferred that the amount of electromagnetic flare energy radiated promptly from the corona, as compared with that radiated from the chromosphere, was significantly affectly by the orientation of the overlying large-scale magnetic field during the period of observation. This trend is shown to be consistent despite some periodic variation.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics (ISSN 0038-0938); 85; June 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Examples of problem flares or situations in past solar-terrestrial observations (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Instances of solar activity are discussed in terms of their relative interference with making solar terrestrial observations. Unexpected flares of significance are reported and the geophysical effects of these flares are noted.
    Keywords: SOLAR PHYSICS
    Type: NOAA Solar-Terrest. Predictions Proc., Vol. 1; p 385-397
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    NASA TECHNICAL REPORTS
  • 3
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    Comments on the course of solar activity during the declining phase of solar cycle 20 /1970-74/ (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Observational data on sunspots, the 2800-MHz flux, and calcium plages are interpreted which were obtained during the declining phase of solar cycle 20. It is shown that three pulses of activity occurred during this period and resulted in two conspicuous 'stillstands' in the smooth means of the sunspot, 2800-MHz, and plage data. The longitudes of centers of sunspot and flare activity are found to have clustered in identifiable zones or hemispheres for relatively long periods of time. The sun is seen to have had a relatively inactive hemisphere centered about zero deg longitude, and certain well defined coronal holes were apparently located near the middle of this hemisphere. The first sunspot groups of cycle 21 are observed to have formed in the longitude zones associated with relatively high levels of activity during cycle 20.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 42; May 1975
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    NASA TECHNICAL REPORTS
  • 4
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    Large scale solar magnetic fields at the site of flares, the greatness of flares, and solar-terrestrial disturbances (1982)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Evidence is presented for an intrinsically solar effect which may dominate such solar-terrestrial correlations as that reported by Chertkov (1976), where large H-alpha flares during 1967-1972 in solar active regions with overlying fields on a 100,000 km scale and predominantly north-to-south orientation were more efficient in the production of geomagnetic disturbances than comparable flares in regions whose fields at the flare sites were directed south-to-north. In addition to being responsible for geomagnetic disturbance enhancements, this purely solar effect may cause solar wind velocity and solar flare proton flux enhancements. If the effect can be generalized to other portions of the solar cycle, it could improve present understanding of the flare mechanism and therefore prove useful in the prediction of solar-terrestrial disturbances.
    Keywords: SOLAR PHYSICS
    Type: Geophysical Research Letters; 9; Mar. 198
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  • 5
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    Some comments on flares after many years of observation (1976)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Ground based observations of flares are reviewed in search of information on flare build up on either a long or a short time scale. Plots of flare frequency and importance for certain individual centers of activity suggest a possible crescendo in flare occurrence days and hours before the development of large and significant flares. The X-ray records follow the same pattern of apparent build-up. A possible dependence between successive major flares, as phases one and two of a single complex flare event, suggests that the time scale in which the total flare event takes place may exhibit extreme variation.
    Keywords: SOLAR PHYSICS
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