SS Space Science MO&DA Programs - August 2000 - Page 1 ACE Instrument Status Report Cosmic Ray Isotope Spectrometer (CRIS) Normal Operation. Electron Proton.

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Presentation transcript:

SS Space Science MO&DA Programs - August Page 1 ACE Instrument Status Report Cosmic Ray Isotope Spectrometer (CRIS) Normal Operation. Electron Proton Alpha Monitor (EPAM ) and Magnetometer (MAG) Normal Operation. RTSW data was valid during the July event. Solar Energetic Particle Ionic Charge Analyser (SEPICA) SEPICA is presently generating science data on half of Fan 3. Diagnostic tests are in progress to determine the cause of anomalies with several data channels required to produce good science from the other half of Fan 3. The science data within SEPICA will be redirected to a spare portion of instrument memory to test the possibility that the existing memory has been damaged. A procedure to perform this step is in final test, and may be uploaded to the instrument this week. Fan pressures have been stable for approximately eight months. Fan 2 is still just below the threshold for operation, and Fan 3 is at a completely nominal pressure.

SS Space Science MO&DA Programs - August Page 2 ACE Instrument Status Report (cont.) Solar Isotope Spectrometer (SIS) Normal Operation. July 14 event: Because of the large geometry factor of the instrument, SIS count rates were saturated for several days during event, rendering the RTSW data invalid for the period. Detector thresholds were raised in order to reduce the count rates. However, raising these thresholds causes NOAA RTSW data processing software to calculate incorrect fluxes. The thresholds were lowered when particle intensities dropped sufficiently. The SIS team is considering options for improving the instrument response to events like this in the future. SIS continued to return pulse-height data during the event, and analysis of these data is underway. Solar Wind Electron Proton Alpha Monitor (SWEPAM) Normal Operation. No changes to instrument operation in recent months. July 14 event: High background counts caused a breakdown in the onboard algorithm which chooses the energy range to measure. Because of the high counts, the instrument always measured the lowest possible energy range (~250 eV to 1.8 keV). During the event, the solar wind speed was sufficiently high that this energy range did not include the main solar wind proton beam. The instrument was healthy, it just was looking in the wrong place. The SWEPAM RTSW data was not valid for ~36 hours during the event because of this effect. However, SWEPAM also has a mode which measures the full energy range (250 eV to ~17 keV) once each half hour. These data do show the solar wind peak, and we should eventually be able to solar solar wind moments from them.

SS Space Science MO&DA Programs - August Page 3 ACE Instrument Status Report (cont.) Solar Wind Ion Composition Spectrometer (SWICS) and Solar Wind Ion Mass Spectrometer (SWIMS) Normal Operation. SWICS and SWIMS are just fine, with no anomalies whatsoever. In May of this year the level of the SWICS Post Acceleration Power Supply was increased to about 26.1 kV (from its previous 22.8 kV) and it has operated there without incident since then. The higher voltage level increases the energy range of SWICS measurements. Except for extremely high count rates, there were also no anomalies during the solar storm period of July 14-16, Ultra Low Energy Isotope Spectrometer (ULEIS) Since April 3, 2000 one of the two redundant TOF systems in ULEIS (TOF-1) has not returned reliable data. Therefore the ULEIS team has turned off the high voltage on the TOF-1 system to minimize the risk of high voltage discharge. The command was executed on June 19, The ULEIS team has found that the mass resolution from the remaining TOF-2 system is quite good, and isotopes such as 3 He and 22 Ne are still resolved.