Ulysses HISCALE Data Analysis Handbook
Appendix A: PI Comments/Explanations and Caveats
Appendix A4 (HISCALE/LAN Experiment)
PI Comments/Explanations
The HISCALE instrument consists of four passively shielded solid state detector assemblies that count stopping particles in a ladder of total energy windows from about 56 keV to 4.8 MeV for energetic ions arriving at 30 degrees (LEMS30) and 120 degrees (LEMS120) to the Ulysses spin axis and about 40 keV to 290 keV for electrons arriving at 60 degrees (LEFS60) and 150 degrees (LEFS150). Additional electron measurements are made by magnetically deflecting 38 to 315 keV electrons arriving at 30 degrees (DE1, 2, 3, and 4). Two-parameter, dE/dX and E, count rates and pulse height analyzed events are obtained by a two element stack which accepts 0.48 to 1.2 MeV protons, 0.39 to 7 MeV/nucleon alphas, 0.465 to 1.7 MeV/nucleon (oxygen) medium nuclei, and iron group nuclei above 0.24 MeV/nucleon. The HISCALE instrument is designed to provide adequate information on energy spectrum, species composition, and angular distribution of charged particles.
The channels selected for use in the CDF are P2' and P5' from LEMS120, DE2 and DE4 for the 30 degree deflected electrons, and W3 (0.39 to 1.3 MeV/nucleon alphas, two parameter rate) and W5 (0.46 to 1.7 MeV/nucleon oxygen, two parameter rate) arriving at 60 degrees. All of the HISCALE CDF channels are averaged over about 42 revolutions.
Because of the absence of active anti-coincidence shielding and the nearby presence of the spacecraft RTG, background contributions to the HISCALE rate channels are often significant and must be taken into account in estimating the foreground, spin-averaged, fluxes. The HISCALE CDF algorithm does not subtract backgrounds. CDF users should apply the corrections tabulated here to obtain accurate flux estimates.
Dr. Thomas P. Armstrong, Fundamental Technologies, LLC, 2411 Ponderosa, Suite A, Lawrence, Kansas 66046, USA.
Tel. +1 785 840-0800;
Fax +1 785 840-0808;
e-mail: armstrong@ftecs.com
21 February 1994
HISCALE CDF Channel Information
| Channel Name |
Lower Threshold (MeV/nuc) |
Upper Threshold (MeV/nuc) |
Geometrical Factor (cm2-sr) |
Flux Factor 1/G* delta E) (#cm sec sr MeV/nuc) |
Background Rate (intercept) (c/sec) |
Background Rate (slope) (c/sec)/hour |
| P2' | 0.077 | 0.127 | 0.428 | 46.73 | 1.06 | 0.000019 |
| P5' | 0.336 | 0.601 | 0.428 | 8.82 | 0.28 | 0.0000081 |
| DE2 | 0.053 | 0.103 | 0.14 | 142.86 | 1.15 | 0 |
| DE4 | 0.175 | 0.315 | 0.14 | 51.02 | 0.5 | 0 |
| W3 | 0.389 | 1.278 | 0.103 | 10.92 | .0003 | 0 |
| W5 | 0.465 | 1.709 | 0.103 | 7.80 | 0 | 0 |
Notes:
1. Background rates in P2' and P5' are time dependent.
Bkg = Intercept + slope * (hours since 1990:318:00)
2. Flux equivalent of background is obtained from:
Flux = Flux Factor * Rate
Next: Appendix A5 (EPAC/KEP Experiment)
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Updated 8/8/19, Cameron Crane
QUICK FACTS
Mission End Date: June 30, 2009
Destination: The inner heliosphere of the sun away from the ecliptic plane
Orbit: Elliptical orbit transversing the polar regions of the sun outside of the ecliptic plane