Analysis of short-period changes in intensity of hard X-radiation of solar flares registered aboard Venera-13 and Venera-14 spacecraft

Details Analysis of short-period changes in intensity of hard X-radiation of solar flares registered aboard Venera-13 and Venera-14 spacecraft Analysis of short-period changes in intensity of hard X-radiation of solar flares registered aboard Venera-13 and Venera-14 spacecraft

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985rpspr...9...31b&link_type=abstract

In its USSR Rept.: Space (JPRS-USP-85-004) p 31 (SEE N85-26772 16-12) Transl. into ENGLISH from Pisma v Astron. Zh. (Moscow),

Astronomy and Astrophysics

Astronomy

Fourier Analysis, Solar Corona, Solar Flares, Time Measurement, X Ray Astronomy, Maximum Entropy Method, Radiometric Resolution, Time Series Analysis, Venera Satellites, X Ray Sources

Scientific paper

Solar flare information obtained using the Venera-13 and Venera-14 (which carried SNEG-2M3 instruments) for the period up to 30 May 1981 is reported. The basis for the study was 140 records of solar events with a duration of 16 sec with a resolution of 1/64 sec and with a duration of 64 sec with a resolution of 0.5 sec. Data were processed in two stages. All 140 flare records were first subjected to Fourier analysis. If a reliable peak was discovered in the power spectrum of some event a further analysis of this event was made by a different method. The maximum entropy method was used since it has the best frequency resolution for short records of time series. The results of this analysis (and H alpha data) are tabulated. Each event is briefly discussed. The events of 27 and 29 March 1982, for example, corresponded to a region measuring 9.8x10 to the 18th cm. The events evidently occurred in the solar corona. The common source was characterized by quasiperiodic changes in the intensity of hard X-radiation.

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