RHESSI Operations
The RHESSI Mission and Science Operations Center (MSOC) is located at Space Sciences Laboratory (SSL) on the Campus of the University of California at Berkeley. Communication with the spacecraft is established six times per day via the Berkeley Ground Station to monitor spacecraft health and safety, and to retrieve science and engineering data.
RHESSI operations are largely autonomous. The main operations task is the management of the on-board solid-state recorder (SSR) during periods of high solar activity or when sufficient ground station dumps are not available to keep the SSR from filling up. A 'Tohban', a rotating weekly position shared by team scientists, monitors solar activity and the instrument operation daily to ensure that the observations are being taken to maximize the scientific return.
Once the instrument data are recorded in the SSR, it takes up to two days to be telemetered to the ground station. Once at the ground station, the packetized data files are converted to FITS format and distributed to the RHESSI data archives at Goddard and Switzerland. The data are generally available for analysis from one to three days after the observation is made.
Operations Links
Tohban Manual - List of tohban duties and useful links
RHESSI Spacecraft and Instrument Status - Temperatures, voltages, and current status of spacecraft and instrument components from the most recent ground-station pass
Tohban Live - RHESSI Current Status - Real-time Summary Page
State-of-Health Data - Plots and text files of 1-day averages of temperatures, voltages, and more for the entire mission
Detector Resolution - Explanation and plot showing changes in RHESSI detector resolution over time and energy
Detector Efficiency - Changes in RHESSI detector efficiency over time
RHESSI Observation Times - Predicted times for the next two weeks when RHESSI will be acquiring solar data (in sunlight and not in SAA)
SAA and Eclipse Data - Form to request the times when RHESSI entered and exited sunlight, eclipse, the atmospheric absorption zone, the SAA, and the northern and southern magnetic zones
Table of Anneal and Offpoint Times
Records of Changes
- Major Events, 2002-2007 - Changes in behavior of RHESSI subsystems and ground-segment services
- Attenuator State, 2002-2004
- Detector Voltage, 2002-2005
- Decimation/Event Download Status Record, 2002-2005
- Rear Decimation in 2002