منابع مشابه
Periodicities in Solar Coronal Mass Ejections
Mid-term quasi-periodicities in solar coronal mass ejections (CMEs) during the most recent solar maximum cycle 23 are reported here for the first time using the fouryear data (February 5, 1999 to February 10, 2003) of the Large Angle Spectrometric Coronagraph (LASCO) onboard the Solar and Heliospheric Observatory (SOHO). In parallel, mid-term quasi-periodicities in solar X-ray flares (class >M5...
متن کاملPeriodicities in the occurrence of solar coronal mass ejections
Recent overwhelming evidences (Hiremath 2009a and references there in) show that sun indeed strongly influences the earth’s climate and environment. In addition to well known sunspot activity, right from the era of discovery by Galileo, other activity phenomena such as flares and coronal mass ejections are also the main drivers that input vast amount of energy, mass and momentum into the earth’...
متن کاملPeriodicities in Solar Flare Occurrence: Analysis of Cycles 19–23
Mid-range periodicities in solar flare occurrence have been analyzed with new methods for cycles 19–23. During cycle 23, periodicities of 129-d and 33.5-d were in operation. Five episodes of high activity occurred periodically with the 129-d period. The 33.5-d periodicity mainly operated for energetic flares. Results for cycles 19–21 are generally in agreement with previous analyses. For cycle ...
متن کاملSearch for Periodicities in the Homestake Solar Neutrino Data
We evaluate a s2 statistic to test against the Homestake data the hypothesis that the neutrino Ñux from the Sun is constant. We use estimates of standard deviations derived 1000 simulations of the sequence of 108 runs, and we also use two procedures for deriving proxies for the standard deviation from the experimental data. All tests indicate that the hypothesis should be rejected ; the signiÐc...
متن کاملDiscovery of Solar Rieger Periodicities in Another Star
The Rieger periods are solar cycles with a time scale of months, which are present in both flaring activity and sunspot occurrence. These short-term periodicities, tentatively explained by equatorially trapped Rossby-type waves modulating the emergence of magnetic flux at the surface, are considered a peculiar and not yet fully understood solar phenomenon. We chose a stellar system with solar c...
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ژورنال
عنوان ژورنال: Nature
سال: 1982
ISSN: 0028-0836,1476-4687
DOI: 10.1038/298223a0