Cross-calibration of SOHO/ERNE proton and heavy ion measurements with other particle instruments at L1 E. Valtonen, M. Paassilta, R. Vainio, O. Raukunen,

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Presentation transcript:

Cross-calibration of SOHO/ERNE proton and heavy ion measurements with other particle instruments at L1 E. Valtonen, M. Paassilta, R. Vainio, O. Raukunen, and E. Riihonen Space Research Laboratory Department of Physics and Astronomy University of Turku ESWW11 November 17-21, 2014, Liege, Belgium1E. Valtonen

Contents summary  L1 instrument cross-calibrations within SEPServer project  ERNE instrument  Instrumental effects  Finding solutions  Conclusions ESWW11 November 17-21, 2014, Liege, Belgium2E. Valtonen

L1 instrument cross-calibrations within SEPServer project  SEPServer EU FP7 funded project Server to access SEP and related EM data and analysis tools  Data quality assessment Cross-calibration of instruments at L1 E.g., SOHO/ERNE, SOHO/EPHIN, ACE/EPAM, and ACE/SIS proton and helium spectra and SOHO/ERNE and ACE/SIS heavy ion spectra See also Poster Id by B. Heber et al. Generally relatively good agreement, but also some instrumental effects found E. ValtonenESWW11 November 17-21, 2014, Liege, Belgium3

“Relatively good agreement” E. ValtonenESWW11 November 17-21, 2014, Liege, Belgium4

ERNE instrument  Two sensors E. ValtonenESWW11 November 17-21, 2014, Liege, Belgium5 Low Energy Detector (LED) High Energy Detector (HED) 70 mm  Proton and helium spectra constructed onboard  Heavy ions as pulse heights to ground D1 D2 D3 Four layers of strip detectors

Instrumental effects E. ValtonenESWW11 November 17-21, 2014, Liege, Belgium6 ? Steep fall? ? Bump Inaccurate G? In addition: Saturation of HED during largest SEP events Not considered here

Finding solutions  Bump in proton spectrum Due to background: inefficient anticoincidence shield E. ValtonenESWW11 November 17-21, 2014, Liege, Belgium7 Particles “stopping” in D3 Protons Helium Background

Ground-processedSelected ground-processed converted to onboard-analysed

Finding solutions  Steep fall of proton spectrum E. ValtonenESWW11 November 17-21, 2014, Liege, Belgium9 IMP-8 GME data from Partial cause: onboard event selection? o Cuts out highest energy protons Instrument aging?

GOES 11 SEM data from ftp://satdat.ngdc.noaa.gov/sem/goes/ data/new_avg/2004/11/goes11/csv/

Finding solutions  Geometric factor for heavy ions New calculation for ERNE/LED Geant 4 simulation fro ERNE/HED 16 O E. ValtonenESWW11 November 17-21, 2014, Liege, Belgium11 Updated G

For heavy ion measurements, see also poster in Session 8 by Raukunen et al. Updated G

Conclusions E. ValtonenESWW11 November 17-21, 2014, Liege, Belgium13