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Solar Ultraviolet Bursts
Chitta, L. P.; Heinzel, Petr; Toriumi, Shin +16 more
The term "ultraviolet (UV) burst" is introduced to describe small, intense, transient brightenings in ultraviolet images of solar active regions. We inventorize their properties and provide a definition based on image sequences in transition-region lines. Coronal signatures are rare, and most bursts are associated with small-scale, canceling oppos…
The Science of Sungrazers, Sunskirters, and Other Near-Sun Comets
Giordano, Silvio; Raymond, John; Mann, Ingrid +16 more
This review addresses our current understanding of comets that venture close to the Sun, and are hence exposed to much more extreme conditions than comets that are typically studied from Earth. The extreme solar heating and plasma environments that these objects encounter change many aspects of their behaviour, thus yielding valuable information o…