Date: August 21, 2017 This MUNIN data archive includes data from the MEDUSA instrument and the available orbit and attitude data for the MUNIN spacecraft. Documents on the MUNIN spacecraft and published articles are included within this archive and are detailed below. The MEDUSA instrument was also flown on the Astrid-2 Swedish small satellite and the readers are directed to documents concerning the MEDUSA instrument on the Astrid-2 satellite if more information on MEDUSA is needed. AxelssonAhl2001.pdf MUNIN Communication System Details (MS Thesis) BarabaseEtAl2003.pdf MUNIN Attitude Determination HapgoodEtAl.pdf Microsatellite Usage Paper Hapgood2008.pdf Microsatellite Usage Report Johnsson.pdf Brief Description of the MUNIN Spacecraft Keith_AGU1999.pdf MEDUSA Presentation NorbergEtAl1999.pdf MUNIN Instrument (pre-print) NorbergEtAl2001.pdf ASTRID-2 Instrument Paper OvchinnikovEtAl2000.pdf MUNIN Attitude Control Overview OvchinnikovAndPenkov2002.pdf MUNIN Magnetic Attitude Control Details Winningham1998.pdf MEDUSA Report YamauchiEtAl2002.pdf MUNIN Payload ******************************************************************************** Note that data from other MUNIN instrumentation is not in this archive. It should be requested through either Olle Norberg (address below) or Stas Barabash stas.barabash@irf.se Swedish Institute of Space Physics Box 812, SE-981 28 Kiruna, SWEDEN ******************************************************************************** ***** Contacts (2017) - ***** ******************************************************************************** MEDUSA Instrument: J. David Winningham dwinningham@swri.edu 6220 Culebra Road San Antonio, TX 78238, USA Wayne Keith keith.wayne@mcm.edu Department of Physics McMurry University 1400 Sayles Blvd. Abilene, Texas 79697, USA Rudy Frahm rfrahm@swri.edu 6220 Culebra Road San Antonio, TX 78238, USA SPDF CDF Archive: Sandee J. Jeffers sjeffers@swri.edu 6220 Culebra Road San Antonio, TX 78238, USA MUNIN Spacecraft: Olle Norberg Olle.Norberg@snsb.se Swedish National Space Board Box 4006, SE-171 04 Solna, SWEDEN ******************************************************************************** ***** Notes Specific to MUNIN - ***** ******************************************************************************** The CDF is self documenting, so no additional documents should be needed, except the user should be aware of the following, specific for this MUNIN archive: The MEDUSA CDF science data is written in a compact form for ease of use. Sensors are packed into multi-dimensional arrays based on the data units. The order of the sensors in the multi-dimensional data sets are different than in the scalar data sets. For the scalar data sets, the sensor label describes the sensor; however, for the multi-dimensional data, the label applies to the group and does not fully describe the sensor. The MEDUSA electron sensors in multi-dimensional format have the following order: CDF Sensor MEDUSA Definition for Electrons ========== ========================================================= Sensor 0 MEDUSA Electron energy analyzer - sector 0 (-33.75 deg) Sensor 1 MEDUSA Electron energy analyzer - sector 1 (-56.25 deg) Sensor 2 MEDUSA Electron energy analyzer - sector 2 (-11.25 deg) Sensor 3 MEDUSA Electron energy analyzer - sector 3 (-78.75 deg) Sensor 4 MEDUSA Electron energy analyzer - sector 4 (11.25 deg) Sensor 5 MEDUSA Electron energy analyzer - sector 5 (-101.25 deg) Sensor 6 MEDUSA Electron energy analyzer - sector 6 (33.75 deg) Sensor 7 MEDUSA Electron energy analyzer - sector 7 (-123.75 deg) Sensor 8 MEDUSA Electron energy analyzer - sector 8 (56.25 deg) Sensor 9 MEDUSA Electron energy analyzer - sector 9 (-146.25 deg) Sensor 10 MEDUSA Electron energy analyzer - sector 10 (78.75 deg) Sensor 11 MEDUSA Electron energy analyzer - sector 11 (-168.75 deg) Sensor 12 MEDUSA Electron energy analyzer - sector 12 (101.25 deg) Sensor 13 MEDUSA Electron energy analyzer - sector 13 (168.75 deg) Sensor 14 MEDUSA Electron energy analyzer - sector 14 (123.75 deg) Sensor 15 MEDUSA Electron energy analyzer - sector 15 (146.25 deg) A similar situation exists with the MEDUSA Ion sensors. The definition for the multi-dimensional ion sensors is as follows: CDF Sensor MEDUSA Definition for Ions ========== ==================================================== Sensor 0 MEDUSA Ion energy analyzer - sector 0 (56.25 deg) Sensor 1 MEDUSA Ion energy analyzer - sector 1 (33.75 deg) Sensor 2 MEDUSA Ion energy analyzer - sector 2 (78.75 deg) Sensor 3 MEDUSA Ion energy analyzer - sector 3 (11.25 deg) Sensor 4 MEDUSA Ion energy analyzer - sector 4 (101.25 deg) Sensor 5 MEDUSA Ion energy analyzer - sector 5 (-11.25 deg) Sensor 6 MEDUSA Ion energy analyzer - sector 6 (123.75 deg) Sensor 7 MEDUSA Ion energy analyzer - sector 7 (-33.75 deg) Sensor 8 MEDUSA Ion energy analyzer - sector 8 (146.25 deg) Sensor 9 MEDUSA Ion energy analyzer - sector 9 (-56.25 deg) Sensor 10 MEDUSA Ion energy analyzer - sector 10 (168.75 deg) Sensor 11 MEDUSA Ion energy analyzer - sector 11 (-78.75 deg) Sensor 12 MEDUSA Ion energy analyzer - sector 12 (-168.75 deg) Sensor 13 MEDUSA Ion energy analyzer - sector 13 (-101.25 deg) Sensor 14 MEDUSA Ion energy analyzer - sector 14 (-146.25 deg) Sensor 15 MEDUSA Ion energy analyzer - sector 15 (-123.75 deg) The angular measure attached to the sensor label is unique for the MUNIN spacecraft. Because MUNIN was magnetically stabilized, the MEDUSA sensors are always pointed at a constant angle with respect to the magnetic field. This angle combined with the sensor pointing direction is used to determine the approximate pitch angle which is the angular value included in the label. It should be regarded as an approximate pitch angle because MUNIN contains no magnetometer to verify the pitch angle. Positive angles represent the pitch angles in one direction while negative angles represent values in the opposite direction of the 360 deg acceptance plane of MEDUSA.