منابع مشابه
Superflares on Ordinary Solar-type Stars
Short duration flares are well known to occur on cool main-sequence stars as well as on many types of ‘exotic’ stars. Ordinary main-sequence stars are usually pictured as being static on time scales of millions or billions of years. Our sun has occasional flares involving up to ∼ 10 ergs which produce optical brightenings too small in amplitude to be detected in disk-integrated brightness. Howe...
متن کاملAre superflares on solar analogues caused by extra-solar planets?
Stellar flares with 10 − 10 times more energy than the largest solar flare have been detected from 9 normal F and G main sequence stars (Schaefer, King & Deliyannis 1999). These superflares have durations of hours to days and are visible from at least x-ray to optical frequencies. The absence of world-spanning aurorae in historical records and of anomalous extinctions in the geological record i...
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This manuscript is a review of a number of ethnobotany and ethnopharmacology texts and papers in order to arrive at current understanding and scope of ethnobotany and ethnopharmacology. It includes either a brief definition of both fields and presenting some examples on them. Also it has a glimpse on the geographical coverage of research works throughout the world, important issue of prope...
متن کاملDiscovery and Development of a Style-Making Figure
Styles in the normal course of historical development change and evolve, and in the process of this movement and change, some poets play a vital role. These poets try to be inventive in order to escape banality and repeated and shallow literary traditions, and by creating a rift between themselves and former traditions they introduce new elements. These artists either create new figures o...
متن کاملThe superflares of soft γ-ray repeatres: giant quakes in solid quark stars?
Three times of supergiant flares from soft γ-ray repeatres are observed, with typical released energy of ∼ 10 erg. A conventional model (i.e., the magnetar model) for such events is catastrophic magnetism-powered instability through magnetohydrodynamic process, in which a significant part of short-hard γ-ray bursts could also be the results of magnetars. Based on various observational features ...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2015
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921316000491