Quasi-period outflows observed by the X-Ray Telescope onboard Hinode in the boundary of an active region

Abstract

Persistent outflows have recently been detected at boundaries of some active regions. Although these outflows are suggested to be possible sources of the slow solar wind, the nature of these outflows is poorly understood. Through an analysis of an image sequence obtained by the X-Ray Telescope onboard the Hinode spacecraft, we found that quasi-period outflows are present in the boundary of an active region. The flows are observed to occur intermittently, often with a period of 5-10 minutes. The projected flow speed can reach more than 200 km/s, while its distribution peaks around 50 km/s. This sporadic high-speed outflow may play an important role in the mass loading process of the slow solar wind. Our results may imply that the outflow of the slow solar wind in the boundary of the active region is intermittent and quasi-periodic in nature.

5 figures, accepted by RAA

References in corpus (8)

• Magnetic Reconnection along Quasi-Separatrix Layers as a Driver of Ubiquitous Active Region Outflows
• SOHO/SUMER Observations of Prominence Oscillation Before Eruption
• Observing Episodic Coronal Heating Events Rooted in Chromospheric Activity
• STEREO Observations of Quasi-Periodically Driven High Velocity Outflows in Polar Plumes
• The nascent fast solar wind observed by EIS onboard Hinode
• Upflows in funnel-like legs of coronal magnetic loops
• Signature of mass supply to quiet coronal loops
• Network oscillations at the boundary of an equatorial coronal hole

Cited by in corpus (8)

• MHD Waves and Coronal Seismology: an overview of recent results
• Two components of the coronal emission revealed by EUV spectroscopic observations
• The Spectroscopic Signature of Quasi-periodic Upflows in Active Region Timeseries
• MHD Waves in open coronal structures
• Active region upflows: 2. Data driven MHD modeling
• Dynamics in the transition region beneath active region upflows viewed by IRIS
• Active region upflows: 1. Multi-instrument observations
• Analysis of a Failed Eclipse Plasma Ejection Using EUV Observations