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2017 February 28

Hinode XRT Observes the Sun!
Click for movie. Also available on YouTube.

A Void Left After a Filament Eruption

Observing the Sun with a wide field of view sometimes catches an interesting event at an unexpected place. Hinode XRT usually observes a relatively small area of the Sun (typically the size of an active region) with high temporal and spatial resolution, but this event was caught in our synoptic full-Sun observing program, which runs twice every day.

On 5 November 2016, during our morning full-Sun observing program, XRT observed a bright arcade of loops in the North-West hemisphere. Such arcades are often observed as the aftermath of a filament eruption. But this event is special because a dark round structure, that looks like a void, is located North-East of the arcades.

It is known that a "coronal dimming" is sometimes observed around the foot points of erupting filaments. According to the SDO/AIA movie of this filament eruption, the location of the void seems to correspond to the place where the northern part of the filament started to expand rapidly. A possible explanation would be that the coronal plasma that existed in the void was depleted or swept away by the rapid expansion of the erupting filament.

Keywords: Filament, CME
Filters: Al_mesh, Al_poly, Be_thin

(Prepared by Aki Takeda & Chunming Zhu)

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