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• W2368359943 abstract "Explosive events are small-scale dynamic events often detected in the far and extreme ultraviolet(FUV/EUV) spectral lines of the Sun,which are emitted mainly by the solar transition region.They have a small spatial scale of about 1500 km and a short lifetime of about 60 s on average.As transient events and jets,they are characterized by non-Gaussian and broad profiles with an enhancement of emission in the blue/red wings resulting from a high velocity component. Typically,these bi-directional streams have an average line-of-sight velocity of 100 km·s~(-1), which is comparable to the local Alfven velocity in the chromosphere.Explosive events tend to occur along the boundaries of the magnetic network and in cell regions,where weak mixed-polarity magnetic features are present.Because typical explosive events produce apparently bi-directional flows with high velocities,they have been suggested to be a consequence of small-scale magnetic reconnection.Sometimes,explosive events are also found to burst repeatedly in the same region, which may be caused by repetitive reconnection triggered by P-modes or transverse oscillations of the flux tubes.Although explosive events are best seen in typical transition-region lines,they can also be detected in spectral lines with a wide formation temperature ranging from about 1×10~4～5×10~5 K.When an explosive event can be seen in a chromospheric line(H I Ly 6,20 000 K),a delay time of about 20～40 s in the response of the transition-region line (S IV,200 000 K) has been observed.However,there are almost no explosive events seen in coronal lines such as the Mg X line.Relationship between explosive events and other small-scale events observed in the transition region,such as blinkers and EUV spicules has also been investigated during the SOHO era.It is found that explosive events have the size and duration which are comparable to unit brightening events which may constitute blinkers.Nevertheless, statistical studies by some authors have suggested that explosive events and blinkers are different phenomena,although sometimes they can be observed to occur cospatially and coincidently.On the other hand,some studies show evidence that explosive events may be associated with macro-spicules observed at EUV wavelengths above the solar limb.Analysis of the energetics of explosive events indicates that the energy flux released by these events might be insignificant for heating the solar atmosphere globally.However,the mass flux carried by such events could become a significant source of the solar wind in the coronal-hole region.In this paper,the observational characteristics of explosive events are firstly reviewed and the methods used to identify them are described.Then the formation mechanism of explosive events,their possible relation with other small-scale dynamic events observed in the transition region and the impact on coronal heating and nascent solar wind are discussed.Finally,the future study of explosive events is prospected." @default.
• W2368359943 created "2016-06-24" @default.
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• W2368359943 date "2010-01-01" @default.
• W2368359943 modified "2023-09-25" @default.
• W2368359943 title "Observational and Theoretical Studies on Explosive Events in the Solar Transition Region" @default.
• W2368359943 hasPublicationYear "2010" @default.
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