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2006•Unpublished venueRequires access

Flare Associated Oscillations Observed with NoRH

Ayumi Asai

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Abstract

We present an examination of the multi-wavelength observation of a C7.9 flare which occurred on 1998 November 10. This is an imaging observation of the quasi-periodic pulsations (QPPs) obtained with Yohkoh/HXT and Nobeyama Radioheliograph (NoRH). We found that the Alfven transit time along the flare loop was almost equal to the period of the QPP. We therefore suggest that variations of macroscopic magnetic structures, such as oscillations of coronal loops, affect the efficiency of particle injection/acceleration. We also report other QPP events observed with NoRH, and review some works on these flare-associated oscillations.

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What this paper is about

We present an examination of the multi-wavelength observation of a C7.9 flare which occurred on 1998 November 10. This is an imaging observation of the quasi-periodic pulsations (QPPs) obtained with Yohkoh/HXT and Nobeyama Radioheliograph (NoRH). We found that the Alfven transit time along the flare loop was almost equal to the period of the QPP. We therefore suggest that variations of macroscopic magnetic structures, such as oscillations of coronal loops, affect the efficiency of particle injection/acceleration. We also report other QPP events observed with NoRH, and review some works on these flare-associated oscillations.

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Available abstract

We present an examination of the multi-wavelength observation of a C7.9 flare which occurred on 1998 November 10. This is an imaging observation of the quasi-periodic pulsations (QPPs) obtained with Yohkoh/HXT and Nobeyama Radioheliograph (NoRH). We found that the Alfven transit time along the flare loop was almost equal to the period of the QPP. We therefore suggest that variations of macroscopic magnetic structures, such as oscillations of coronal loops, affect the efficiency of particle injection/acceleration. We also report other QPP events observed with NoRH, and review some works on these flare-associated oscillations.

Key concepts: Flare, Particle acceleration, Physics, Coronal loop, Solar flare, Astrophysics, Acceleration, Coronal mass ejection

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