Radio, EUV, and X-Ray Observations During a Filament Rise in the 2011 June 7 Solar Flare

Abstract

The most energetic flares start with a filament rise followed by magnetic reconnection below this filament. The start of the reconnection corresponds to the beginning of the flare impulsive phase. In this paper we study processes before this phase. During the filament rise we recognize an unusual radio continuum with a starting boundary drifting toward lower frequencies. The estimated velocity of the agent generating this continuum boundary is about 400 km/s, similar to that of the rising filament. In association with this filament rise, transient X-ray sources and extreme ultaviolet (EUV) brightenings are found near the filament footpoint and outside the locations where later two parallel flare ribbons appear. Moreover, oscillations with a ~30 s period are found simultaneously in radio, EUV, and X-ray observations. Around the end of these oscillations the flare impulsive phase starts as seen in observations of the drifting pulsation structure and X-ray source located at the upper part of the rising filament. We interpret the unusual radio continuum and transient X-ray sources, which are located outside the two parallel flare ribbons, as those generated during an interaction of the rising filament with the above-lying magnetic loops. The EUV brightening at the filament footpoint could be a signature of the magnetic reconnection inside the magnetic rope carrying the filament. Possible scenarios of the ~30 s period oscillations in radio, X-ray, and EUV are discussed.

arXiv comment11 pages, 11 figures

References in corpus (19)

• The Fermi Gamma-Ray Burst Monitor
• An Observational Overview of Solar Flares
• The standard flare model in three dimensions. II. Upper limit on solar flare energy
• CALLISTO - A new concept for solar radio
• Investigation of the Formation and Separation of An EUV Wave from the Expansion of A Coronal Mass Ejection
• Drifting of the line-tied footpoints of CME flux-ropes
• Coronal magnetic reconnection driven by CME expansion -- the 2011 June 7 event
• Break up of returning plasma after the 7 June 2011 filament eruption by Rayleigh-Taylor instabilities
• Quasi-Periodic Pulsations during the Impulsive and Decay phases of an X-class Flare
• Flux cancellation and the evolution of the eruptive filament of 2011 June 7
• Coronal Fourier power spectra: implications for coronal seismology and coronal heating
• Energy release from impacting prominence material following the 2011 June 7 eruption
• Investigating the Dynamics and Density Evolution of Returning Plasma Blobs from the 2011 June 7 Eruption
• Hard X-ray and ultraviolet emission during the 2011 June 7 solar flare
• Particle Acceleration In Plasmoid Ejections Derived From Radio Drifting Pulsating Structures
• Microwave imaging of a hot flux rope structure during the pre-impulsive stage of an eruptive M7.7 solar flare
• A Compressed Sensing-based Image Reconstruction Algorithm for Solar Flare X-Ray Observations
• Analysis of UV and EUV emission from impacts on the Sun after 2011 June 7 eruptive flare
• Oscillations and Waves in Radio Source of Drifting Pulsation Structures

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