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INTEGRAL Satellite on Oct 28 th 2003

INTEGRAL Satellite on Oct 28 th 2003. INTEGRAL Satellite on Oct 28 th 2003. Tsumeb, Namibia 17.6E, 19.1S, 1240m, Air mass : 890 g/cm 2. Conditions at the event time 　・ Zenith angle : 9.5° 　・ Air mass : 902 g/cm 2. Tsumeb Neutron Monitor on Oct 28 th 2003. 6.4σ.

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INTEGRAL Satellite on Oct 28 th 2003

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  1. INTEGRAL Satellite on Oct 28th 2003

  2. INTEGRAL Satelliteon Oct 28th 2003

  3. Tsumeb, Namibia 17.6E, 19.1S, 1240m, Air mass : 890 g/cm2 Conditions at the event time 　・ Zenith angle : 9.5° 　・ Air mass : 902 g/cm2

  4. Tsumeb Neutron Monitor on Oct 28th 2003 6.4σ Excesses were seen between 11:05 – 11:15UT. The statistical significance for 10 minutes is 6.4σ. Assuming that the solar neutrons were produced at 11:05UT, the energy of solar neutrons were >100MeV. Calculate the energy spectrum of solar neutrons (solar surface) ・ Attenuation : Shibata Program (Shibata et al., 1994) ・ Detection Efficiency of NM : Clem & Dorman (2000)

  5. Neutron Spectrum on Oct 28th 2003 (Tsumeb NM) • Power index • = – 3.6 ± 0.3 • Flux @ 100MeV • = (3.1± 1.0)×1027 • [/MeV/sr] Total energy flux of solar neutrons (>100MeV) : 3.1×1025 [erg/sr]

  6. INTEGRAL Satellite on Nov 4th 2003 Peaked at 19:45UT ⇒ Solar neutrons were produced at 19:45UT

  7. Haleakala, Hawaii 203.7E, 20.7N, 3030m, 707 g/cm2 18m2 Neutron Monitor 2003/11/4 19:45UT ・ Zenith angle : 50.5° ・ Air mass : 1112 g/cm2 Mexico City, Mexico 260.8E, 19.3N, 2274m, 780 g/cm2 4m2 Solar Neutron Telescope 2003/11/4 19:45UT ・ Zenith angle : 40.5° ・ Air mass : 1026 g/cm2

  8. Neutron Monitor on Nov 4th 2003 Clear excesses were seen between 19:46 – 20:01 UT 5.3σ 7.5σ Clear excesses were seen between 19:45 – 20:00 UT 5.2σ 3.3σ

  9. Haleakala Neutron Monitor on Nov 4th 2003 5.3σ Clear excesses were seen between 19:46 – 20:01UT. The statistical significance for 15 minutes is 7.5σ. Assuming that the solar neutrons were produced at 19:45UT, the energy of solar neutrons were 59 – 913MeV. Calculate the energy spectrum of solar neutrons (solar surface) ・ Attenuation : Shibata program (Shibata et al., 1994) ・ Detection Efficiency of NM : Clem & Dorman (2000)

  10. Neutron Spectrum on Nov 4th 2003 (Haleakala NM) • Power index • = – 3.9 ± 0.5 • Flux at 100MeV • = (1.5± 0.6)×1028 • [/MeV/sr] (χ2/dof = 0.92/3 = 0.31) Total energy flux of solar neutrons (59 – 913MeV) : 3.4×1026 [erg/sr]

  11. Neutron Time Profile on Nov 4th 2003 Haleakala NM • Power index • = – 3.9 ± 0.5 • Flux at 100MeV • = (1.5± 0.6) • ×1028[/MeV/sr] Mexico NM ・ Attenuation : Shibata program ・ Efficiency of NM : Clem & Dorman ・ Efficiency of SNT : GEANT3 FLUKA-COLOR Hawaii SNT

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