[en] This pamphlet contains the description and explanation of the data in the monthly publication, Solar-Geophysical Data, compiled by the National Geophysical and Solar-Terrestrial Data Center (NGSDC) in Boulder, Colorado. Solar-Geophysical Data is intended to keep research workers abreast on a timely schedule of the major particulars of solar activity and the associated interplanetary, ionospheric, radio propagation and other geophysical effects

[en] This prompt report provides data for January 1977 on: alert periods, daily solar indices, solar flares, solar radio waves, solar x-ray radiation, coronal holes, inferred IP magnetic field polarities, mean solar magnetic fields, and solar wind measurements. It also provides data for December 1976 on: daily solar activity centers, sudden ionospheric disturbances, solar radio waves, cosmic rays, geomagnetic indices, and radio propagation indices

[en] The program was based on simultaneous observations of the same solar region with the Universal Birefringent Filter (UBF) at the Vacuum Tower Telescope (VTT) and with the Big Dome BD Universal Spectrograph (USG). For the UBF images analysis it is referred to the June 13, 1980 RG 2502/2511 (N12-E11) observations. Selected pictures present the line profiles for H-alpha, H-beta, Mg-b1 and Na-D2 at some interesting pixels of the analyzed AR. The detailed photometric morphology of the observed active area and the longitudinal velocity field pattern are presented. A comparison with the corresponding UVSP data is given

[en] This comprehensive report for August 1976, July 1976 and Miscellaneous data provides data on: active regions, synoptic solar maps, solar flares, solar radio waves, energetic solar particles and plasma, synoptic chart, abbreviated calendar record, and regional flare index

No abstract available

[en] The sun-earth relation is reviewed: effects of solar radiation on the ionosphere and the magnetosphere of the earth, effects on the satellite, phenomena in the lower and middle atmosphere linked to the modifications in the X or UV radiations or the flux of high energy protons, inflow of energy in the auroral regions associated with precipitations of particles

[en] Power spectra of window functions with duty cycles between 80% and 99% and with randomly spaced gaps are compared and their effect on observations of solar oscillations are discussed. It is found that for all the cases, observations of solar oscillations would not be severely impacted as long as the gap structure is random rather than periodic

[en] A multi-variate spectral analysis is used to investigate the influence of sunspots by their area and classified according to their age and bright magnetic elements as shown by the full-disc equivalent width of the 1087 nm He-line on the total solar irradiance during 1980 and 1984/85

No abstract available

[en] It is shown that an average occurrence frequency of aurorae in the midlatitudes of the European continent was three events a year during the period 1645-1715