YOHKOH/WBS Recalibration and a Comprehensive Catalogue of Solar Flares Observed by YOHKOH SXT, HXT and WBS Instruments

Sato, Jun; Matsumoto, Y; Yoshimura, Kazuyuki; Kubo, S.; Kotoku, J.; Masuda, S.; Sawa, M.; Suga, K.; Yoshimori, M.; Kosugi, T.; Watanabe, Tetsuya

doi:10.1007/s11207-006-1831-5

Cited by 20 publications

(16 citation statements)

References 8 publications

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“…An SXR feature connects microwave sources 1 and 3. The brightest spots in hard and soft X-ray images coincide, as the catalog by Sato et al (2006) shows. Figure 4b shows the localization of sources of subsecond pulses (see also Figures 4 and 5 in Altyntsev et al, 2003).…”

Section: Observationsmentioning

confidence: 56%

Microwave Type III-Like Bursts as Possible Signatures of Magnetic Reconnection

et al. 2007

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Magnetic reconnection is commonly accepted to play a key role in flare energy release, but only poor information about the main characteristics of this process is available so far. An intrinsic feature of reconnection is plasma density enhancement in current sheets. A unique method to detect this effect is provided by analysis of drifting bursts, whose emission frequency is close to the local Langmuir frequency or its harmonics. With this purpose, we analyze a series of several tens of drifting microwave bursts during the 30 March 2001 flare. The burst drift rates range from −10 to 20 GHz s −1 . Using one-dimensional scans recorded with the SSRT interferometer at two different frequencies near 5.7 GHz, we have measured relative positions of burst sources and their velocities along a flare loop revealed from soft X-ray and extreme-ultraviolet images. It is argued that the contribution of the increasing density effect into the observed frequency drift rates is about 6 GHz s −1 , which is shown to be consistent with theoretical models of magnetic reconnection with reasonable boundary conditions.

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Section: Observationsmentioning

confidence: 56%

Microwave Type III-Like Bursts as Possible Signatures of Magnetic Reconnection

et al. 2007

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“…Most of the flares are at the limb and very little looplike structure can be discerned in the data. Ten of the flares are included in the Sato et al (1993) catalog of flares observed with the Yohkoh SXT and Hard X-Ray Telescope (HXT). The images in the catalog made from the HXT data generally show only one emitting feature-again making it difficult to determine loop size parameters.…”

Section: Discussionmentioning

confidence: 99%

Characteristics of Solar Flare Doppler‐Shift Oscillations Observed with the Bragg Crystal Spectrometer onYohkoh

Mariska

2006

ApJ

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, and inferred displacements of 1070 AE 1710 km, where the listed errors are the standard deviations of the sample means. For some of the flares, intensity fluctuations are also observed. These lag the Dopplershift oscillations by 1/4 period, strongly suggesting that the oscillations are standing slow-mode waves. The relationship between the oscillation period and the decay time is consistent with conductive damping of the oscillations.

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“…We used the Yohkoh Hard X-ray Telescope Flare Catalogue (Sato et al, 2006) and selected a set of flares that had at least three distinct pulses on the HXR light curve and for which at least 10 HXT images could be reconstructed with satisfactory accuracy. To analyze plasma properties of the selected flares we used the Yohkoh Soft X-ray Telescope (SXT; Tsuneta et al, 1991) images obtained with the Be119 and Al12 filters.…”

Section: Observations and Resultsmentioning

confidence: 99%

Testing the Model of Oscillating Magnetic Traps

Szaforz

Tomczak

2014

Sol Phys

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The aim of this paper is to test the model of oscillating magnetic traps (the OMT model), proposed by Jakimiec and Tomczak (Solar Phys. 261, 233, 2010). This model describes the process of excitation of quasi-periodic pulsations (QPPs) observed during solar flares. In the OMT model energetic electrons are accelerated within a triangular, cusp-like structure situated between the reconnection point and the top of a flare loop as seen in soft X-rays. We analyzed QPPs in hard X-ray light curves for 23 flares as observed by Yohkoh. Three independent methods were used. We also used hard X-ray images to localize magnetic traps and soft X-ray images to diagnose thermal plasmas inside the traps. We found that the majority of the observed pulsation periods correlates with the diameters of oscillating magnetic traps, as was predicted by the OMT model. We also found that the electron number density of plasma inside the magnetic traps in the time of pulsation disappearance is strongly connected with the pulsation period. We conclude that the observations are consistent with the predictions of the OMT model for the analyzed set of flares.

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YOHKOH/WBS Recalibration and a Comprehensive Catalogue of Solar Flares Observed by YOHKOH SXT, HXT and WBS Instruments

Cited by 20 publications

References 8 publications

Microwave Type III-Like Bursts as Possible Signatures of Magnetic Reconnection

Microwave Type III-Like Bursts as Possible Signatures of Magnetic Reconnection

Characteristics of Solar Flare Doppler‐Shift Oscillations Observed with the Bragg Crystal Spectrometer onYohkoh

Testing the Model of Oscillating Magnetic Traps

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