Yijun Hou

Light walls around sunspots observed by the Interface Region Imaging Spectrograph

The Interface Region Imaging Spectrograph (IRIS) mission provides high-resolution observations of the chromosphere and transition region. We try to determine whether the light walls exist somewhere else in active regions besides light bridges. Employing half-year high tempo-spatial data from the IRIS, we find lots of light walls either around sunspots or above light bridges. For the first time, we report one light wall near an umbral-penumbral boundary and another along a neutral line between two small sunspots. These new observations reveal that these light walls are multi-layer and multi-thermal structures which occur along magnetic neutral lines in active regions.

SLIPPING MAGNETIC RECONNECTION OF FLUX-ROPE STRUCTURES AS A PRECURSOR TO AN ERUPTIVE X-CLASS SOLAR FLARE

We present the quasi-periodic slipping motion of flux rope structures prior to the onset of an eruptive X-class flare on 2015 March 11, obtained by the \emph{Interface Region Imaging Spectrograph} (\emph{IRIS}) and the \emph{Solar Dynamics Observatory} (\emph{SDO}). The slipping motion occurred at the north part of the flux rope and seemed to successively peel off the flux rope. The speed of the slippage was 30

A SOLAR FLARE DISTURBING A LIGHT WALL ABOVE A SUNSPOT LIGHT BRIDGE

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Flux rope proxies and fan-spine structures in active region NOAA 11897

40 km s

Two Episodes of Magnetic Reconnections during a Confined Circular-ribbon Flare

^{-1}

Coronal Condensations Caused by Magnetic Reconnection between Solar Coronal Loops

, with an average period of 130

Observing Kelvin–Helmholtz instability in solar blowout jet

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Eruption of a multi-flux-rope system in solar active region 12673 leading to the two largest flares in Solar Cycle 24

30 s. The Si {\sc iv} 1402.77 {\AA} line showed a redshift of 10

Flare Ribbons Approach Observed by the Interface Region Imaging Spectrograph and the Solar Dynamics Observatory

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Sunspot Light Walls Suppressed by Nearby Brightenings

30 km s