RHESSI Spectral Analysis of the 1N/M1.9 flare of 20 October 2003

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Presentation transcript:

RHESSI Spectral Analysis of the 1N/M1.9 flare of 20 October 2003 Hui Li1, A. Berlicki2 and B. Schmieder2 1 Purple Mountain Observatory, CAS, China 2 Observatoire de Paris, Section de Meudon, France 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)

The 4th RHESSI Workshop, Paris (25-28 July 2004) Contents Introduction Observations Spectral Analysis Results and Discussions 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)

The 4th RHESSI Workshop, Paris (25-28 July 2004) Introduction (1) Energy transfer in solar flares Thermal or non-thermal? Neupert effect e.g. McDonald et al. 1999 RHESSI High resolution and wide energy band (Lin et al. 2002) Comparison of theoretical models with observations (e.g. Liu et al. 2004) 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)

The 4th RHESSI Workshop, Paris (25-28 July 2004) Introduction (2) Energy compositions of solar flares Enth/Eth=(13-21)% thick target (McDonald et al. 1999) Enth/Eth=(0.03-0.3)% thin target (Berlicki et al. 2004) HXR source motion ~ 10km/s (e.g. Gallagher et al. 2002, Liu et al. 2004) Super-hot component in solar flares 30-47 MK (e.g. Lin et al. 1985; Pike et al. 1996; Lin et al. 2003; Ji et al. 2004) ? ? ? 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)

The 4th RHESSI Workshop, Paris (25-28 July 2004) Observations (1) Summary of observational information for the 1N/M1.9 flare in AR10484 of 20 October 2003 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)

The 4th RHESSI Workshop, Paris (25-28 July 2004) Observations (2) GOES 10 X-ray flux Long duration impulsive phase 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)

The 4th RHESSI Workshop, Paris (25-28 July 2004) Observations (3) 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)

The 4th RHESSI Workshop, Paris (25-28 July 2004) Observations (4) EIT/304Å Movie 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)

The 4th RHESSI Workshop, Paris (25-28 July 2004) Observations (5) 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)

The 4th RHESSI Workshop, Paris (25-28 July 2004) Observations (6) RHESSI/12 – 25 keV, 10s RHESSI/25 – 50 keV, 30s 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)

The 4th RHESSI Workshop, Paris (25-28 July 2004) Observations (7) 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)

The 4th RHESSI Workshop, Paris (25-28 July 2004) Observations (8) 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)

The 4th RHESSI Workshop, Paris (25-28 July 2004) Observations (9) 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)

The 4th RHESSI Workshop, Paris (25-28 July 2004) Observations (10) EIT/304Å at 07:19:34 UT + RHESSI/2550 07:11-07:12 UT Ha at 07:23:00 UT + RHESSI/2550 07:11-07:12 UT 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)

The 4th RHESSI Workshop, Paris (25-28 July 2004) Spectral Analysis (1) Super-hot component? 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)

The 4th RHESSI Workshop, Paris (25-28 July 2004) Spectral Analysis (2) RHESSI 12 –25 keV 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)

The 4th RHESSI Workshop, Paris (25-28 July 2004) Spectral Analysis (3) Collimators & detectors: 1F, 3F-6F, 8F-9F Model: F_vth_bpow (thermal + broken power law) Energy range: 15 – 50 keV Time interval: 60 seconds 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)

The 4th RHESSI Workshop, Paris (25-28 July 2004) Spectral Analysis (4) MODEL: Thermal + broken power law 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)

Spectral Analysis (5) Thermal and non-thermal energy in the flare: (cf. Hudson and Canfield, 1978, McDonald et al, 1999) for thin-target model: 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)

The 4th RHESSI Workshop, Paris (25-28 July 2004) Spectral Analysis (6) 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)

Spectral Analysis (7) Thermal and non-thermal energy in the flare: (cf. Hudson and Canfield, 1978, McDonald et al, 1999) for thick-target model: 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)

The 4th RHESSI Workshop, Paris (25-28 July 2004) Spectral Analysis (8) Ratio of non-thermal energy to thermal energy derived for different low energy cutoffs and models. 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)

The 4th RHESSI Workshop, Paris (25-28 July 2004) Discussions (1) The flare shows long duration impulsive phase multiple magnetic reconnections continuous energy release confined flare no CME associated Superhot component Temax  67 MK Does it really exist ? 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)

The 4th RHESSI Workshop, Paris (25-28 July 2004) Discussions (2) Energy composition: Enontherm/Etherm< 0.38 (thick, Ecutoff =20keV) Enontherm/Etherm< 0.13 (thin, Ecutoff =20keV) The X-ray spectra are “soft” Spectral index > 6 Energy transfer thermal conduction 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)

The 4th RHESSI Workshop, Paris (25-28 July 2004) Discussions (3) The ratio of Enontherm/Etherm is Sensitive to Ecutoff ,  Independent of V (thin-target) Proportional to V-0.5 (thick-target) What is the reasonable value for Ecutoff 20 keV ? 15 keV ? or even 10 keV ? 2018/11/22 The 4th RHESSI Workshop, Paris (25-28 July 2004)