Discovery of Solar Rieger periodicities in another star
نویسندگان
چکیده
منابع مشابه
Discovery 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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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’...
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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 ...
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The search for weak periodic signals in time series data is an active topic of research. Given the fact that rarely a real world dataset is perfectly periodic, this paper approaches this problem in terms of data mining, trying to discover weak periodic signals in time series databases, when no period length is known in advance. In existing time series mining algorithms, the period length is use...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2005
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:200500097