Observation of GeV solar energetic particles from the 1997 November 6 event using Milagrito

A. Falcone, R. Atkins, W. Benbow, D. Berley, M. L. Chen, D. G. Coyne, B. L. Dingus, D. E. Dorfan, R. W. Ellsworth, L. Fleysher, Roman Fleysher, G. Gisler, J. A. Goodman, T. J. Haines, C. M. Huffman, S. Hugenberger, L. A. Kelley, I. Leonor, J. F. McCullough, J. E. McEneryR. S. Miller, A. I. Mincer, M. F. Morales, P. Nemethy, J. M. Ryan, B. Shen, A. Shoup, G. Sinnis, A. J. Smith, G. W. Sullivan, T. Tumer, K. Wang, M. O. Wascko, S. Westerhoff, D. A. Williams, T. Yang, G. B. Yodh

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Milagrito was an extensive air-shower observatory that served as a prototype for the larger Milagro instrument. Milagrito operated from 1997 February to 1998 May. Although it was designed as a very high energy (few hundred GeV threshold) water-Cerenkov gamma-ray observatory, it could also be used to study solar energetic particles (SEPs). By recording sealer data, which correspond to photomultiplier tube singles rates, it was sensitive to muons and small showers from hadronic primary particles with rigidities above ∼4 GV. Milagrito simultaneously recorded air-shower trigger data of primary particles with energies greater than ∼100 GeV that provide the data to help reconstruct event directions. The Milagrito sealers registered a ground-level enhancement associated with the 1997 November 6 SEP event and X9 solar flare. At its peak, the enhancement was 22 times the background rms fluctuations. Based on comparisons to neutron monitor and satellite data, we find evidence that the rigidity power-law spectrum for the differential flux of energetic protons steepened above ∼4 GV and that the acceleration site was high in the corona (at ∼3 R above the photosphere), assuming that a CME-driven shock was responsible for the ground-level enhancement.

Original languageEnglish (US)
Pages (from-to)557-565
Number of pages9
JournalAstrophysical Journal
Volume588
Issue number1 I
DOIs
StatePublished - May 1 2003
Externally publishedYes

Fingerprint

energetic particles
sealers
energetics
cosmic ray showers
rigidity
augmentation
Gamma Ray Observatory
observatory
photomultiplier tubes
photosphere
solar flares
showers
coronas
monitors
muons
observatories
air
actuators
recording
shock

Keywords

  • Acceleration of particles
  • Interplanetary medium
  • Sun: flares
  • Sun: particle emission

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Falcone, A., Atkins, R., Benbow, W., Berley, D., Chen, M. L., Coyne, D. G., ... Yodh, G. B. (2003). Observation of GeV solar energetic particles from the 1997 November 6 event using Milagrito. Astrophysical Journal, 588(1 I), 557-565. https://doi.org/10.1086/373950

Observation of GeV solar energetic particles from the 1997 November 6 event using Milagrito. / Falcone, A.; Atkins, R.; Benbow, W.; Berley, D.; Chen, M. L.; Coyne, D. G.; Dingus, B. L.; Dorfan, D. E.; Ellsworth, R. W.; Fleysher, L.; Fleysher, Roman; Gisler, G.; Goodman, J. A.; Haines, T. J.; Huffman, C. M.; Hugenberger, S.; Kelley, L. A.; Leonor, I.; McCullough, J. F.; McEnery, J. E.; Miller, R. S.; Mincer, A. I.; Morales, M. F.; Nemethy, P.; Ryan, J. M.; Shen, B.; Shoup, A.; Sinnis, G.; Smith, A. J.; Sullivan, G. W.; Tumer, T.; Wang, K.; Wascko, M. O.; Westerhoff, S.; Williams, D. A.; Yang, T.; Yodh, G. B.

In: Astrophysical Journal, Vol. 588, No. 1 I, 01.05.2003, p. 557-565.

Research output: Contribution to journalArticle

Falcone, A, Atkins, R, Benbow, W, Berley, D, Chen, ML, Coyne, DG, Dingus, BL, Dorfan, DE, Ellsworth, RW, Fleysher, L, Fleysher, R, Gisler, G, Goodman, JA, Haines, TJ, Huffman, CM, Hugenberger, S, Kelley, LA, Leonor, I, McCullough, JF, McEnery, JE, Miller, RS, Mincer, AI, Morales, MF, Nemethy, P, Ryan, JM, Shen, B, Shoup, A, Sinnis, G, Smith, AJ, Sullivan, GW, Tumer, T, Wang, K, Wascko, MO, Westerhoff, S, Williams, DA, Yang, T & Yodh, GB 2003, 'Observation of GeV solar energetic particles from the 1997 November 6 event using Milagrito', Astrophysical Journal, vol. 588, no. 1 I, pp. 557-565. https://doi.org/10.1086/373950
Falcone A, Atkins R, Benbow W, Berley D, Chen ML, Coyne DG et al. Observation of GeV solar energetic particles from the 1997 November 6 event using Milagrito. Astrophysical Journal. 2003 May 1;588(1 I):557-565. https://doi.org/10.1086/373950
Falcone, A. ; Atkins, R. ; Benbow, W. ; Berley, D. ; Chen, M. L. ; Coyne, D. G. ; Dingus, B. L. ; Dorfan, D. E. ; Ellsworth, R. W. ; Fleysher, L. ; Fleysher, Roman ; Gisler, G. ; Goodman, J. A. ; Haines, T. J. ; Huffman, C. M. ; Hugenberger, S. ; Kelley, L. A. ; Leonor, I. ; McCullough, J. F. ; McEnery, J. E. ; Miller, R. S. ; Mincer, A. I. ; Morales, M. F. ; Nemethy, P. ; Ryan, J. M. ; Shen, B. ; Shoup, A. ; Sinnis, G. ; Smith, A. J. ; Sullivan, G. W. ; Tumer, T. ; Wang, K. ; Wascko, M. O. ; Westerhoff, S. ; Williams, D. A. ; Yang, T. ; Yodh, G. B. / Observation of GeV solar energetic particles from the 1997 November 6 event using Milagrito. In: Astrophysical Journal. 2003 ; Vol. 588, No. 1 I. pp. 557-565.
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abstract = "Milagrito was an extensive air-shower observatory that served as a prototype for the larger Milagro instrument. Milagrito operated from 1997 February to 1998 May. Although it was designed as a very high energy (few hundred GeV threshold) water-Cerenkov gamma-ray observatory, it could also be used to study solar energetic particles (SEPs). By recording sealer data, which correspond to photomultiplier tube singles rates, it was sensitive to muons and small showers from hadronic primary particles with rigidities above ∼4 GV. Milagrito simultaneously recorded air-shower trigger data of primary particles with energies greater than ∼100 GeV that provide the data to help reconstruct event directions. The Milagrito sealers registered a ground-level enhancement associated with the 1997 November 6 SEP event and X9 solar flare. At its peak, the enhancement was 22 times the background rms fluctuations. Based on comparisons to neutron monitor and satellite data, we find evidence that the rigidity power-law spectrum for the differential flux of energetic protons steepened above ∼4 GV and that the acceleration site was high in the corona (at ∼3 R⊙ above the photosphere), assuming that a CME-driven shock was responsible for the ground-level enhancement.",
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T1 - Observation of GeV solar energetic particles from the 1997 November 6 event using Milagrito

AU - Falcone, A.

AU - Atkins, R.

AU - Benbow, W.

AU - Berley, D.

AU - Chen, M. L.

AU - Coyne, D. G.

AU - Dingus, B. L.

AU - Dorfan, D. E.

AU - Ellsworth, R. W.

AU - Fleysher, L.

AU - Fleysher, Roman

AU - Gisler, G.

AU - Goodman, J. A.

AU - Haines, T. J.

AU - Huffman, C. M.

AU - Hugenberger, S.

AU - Kelley, L. A.

AU - Leonor, I.

AU - McCullough, J. F.

AU - McEnery, J. E.

AU - Miller, R. S.

AU - Mincer, A. I.

AU - Morales, M. F.

AU - Nemethy, P.

AU - Ryan, J. M.

AU - Shen, B.

AU - Shoup, A.

AU - Sinnis, G.

AU - Smith, A. J.

AU - Sullivan, G. W.

AU - Tumer, T.

AU - Wang, K.

AU - Wascko, M. O.

AU - Westerhoff, S.

AU - Williams, D. A.

AU - Yang, T.

AU - Yodh, G. B.

PY - 2003/5/1

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N2 - Milagrito was an extensive air-shower observatory that served as a prototype for the larger Milagro instrument. Milagrito operated from 1997 February to 1998 May. Although it was designed as a very high energy (few hundred GeV threshold) water-Cerenkov gamma-ray observatory, it could also be used to study solar energetic particles (SEPs). By recording sealer data, which correspond to photomultiplier tube singles rates, it was sensitive to muons and small showers from hadronic primary particles with rigidities above ∼4 GV. Milagrito simultaneously recorded air-shower trigger data of primary particles with energies greater than ∼100 GeV that provide the data to help reconstruct event directions. The Milagrito sealers registered a ground-level enhancement associated with the 1997 November 6 SEP event and X9 solar flare. At its peak, the enhancement was 22 times the background rms fluctuations. Based on comparisons to neutron monitor and satellite data, we find evidence that the rigidity power-law spectrum for the differential flux of energetic protons steepened above ∼4 GV and that the acceleration site was high in the corona (at ∼3 R⊙ above the photosphere), assuming that a CME-driven shock was responsible for the ground-level enhancement.

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KW - Acceleration of particles

KW - Interplanetary medium

KW - Sun: flares

KW - Sun: particle emission

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