KPL/IK EPD Instrument Kernel =========================================================================== This instrument kernel (I-kernel) briefly describes and contains orientative information of the Field-of-View (FoV) and/or Field-of-Regard (FoR) and of the line of sight (boresight) of the Energetic Particle Detector (EPD) sensors. DISCLAIMER: This I-kernel should not be used as a reference for the instrument nor for data analysis for the FoVs will not be updated to reflect best known / calibrated FoVs, nor variation according to mode. Version and Date ----------------------------------------------------------------------------- Version 0.1 -- June 20, 2017 -- Marc Costa Sitja, ESAC/ESA Updated typo in SOLO_EPD_HET_MY and SOLO_EPD_HET_PY definitions. Version 0.0 -- May 16, 2017 -- Marc Costa Sitja, ESAC/ESA Preliminary Version. References ----------------------------------------------------------------------------- 1. ``Kernel Pool Required Reading''. 2. ``Frames Required Reading''. 3. ``C-Kernel Required Reading''. 4. Solar Orbiter Spacecraft Frames Definition Kernel. 5. ``Solar Orbiter Energic Particle Detector EPD Instrument User Manual'', SO-EPD-PO-MA-0002, Issue 2, Revision 7, 9th September 2016. Contact Information ----------------------------------------------------------------------------- If you have any questions regarding this file contact SPICE support at ESAC: Marc Costa Sitja (+34) 91-8131-457 mcosta@sciops.esa.int, esa_spice@sciops.esa.int or the Solar Orbiter Science Operations Center at ESAC: sol_soc@esa.int Implementation Notes ----------------------------------------------------------------------------- This file is used by the SPICE system as follows: programs that make use of this frame kernel must "load" the kernel normally during program initialization. Loading the kernel associates the data items with their names in a data structure called the "kernel pool". The SPICELIB routine FURNSH loads a kernel into the pool as shown below: FORTRAN: (SPICELIB) CALL FURNSH ( frame_kernel_name ) C: (CSPICE) furnsh_c ( frame_kernel_name ); IDL: (ICY) cspice_furnsh, frame_kernel_name MATLAB: (MICE) cspice_furnsh ( 'frame_kernel_name' ) PYTHON: (SPICEYPY)* furnsh( frame_kernel_name ) In order for a program or routine to extract data from the pool, the SPICELIB routines GDPOOL, GIPOOL, and GCPOOL are used. See [2] for more details. This file was created and may be updated with a text editor or word processor. * SPICEPY is a non-official, community developed Python wrapper for the NAIF SPICE toolkit. Its development is managed on Github. It is available at: https://github.com/AndrewAnnex/SpiceyPy Naming Conventions ----------------------------------------------------------------------------- Data items are specified using ''keyword=value'' assignments [1]. All keywords referencing values in this I-kernel start with the characters `INS' followed by the NAIF SOLO instrument ID code, constructed using the spacecraft ID number (-144) followed by the NAIF three digit ID number for one of the EPD data item. These IDs are as follows Instrument name ID -------------------- ------- SOLO_EPD_STEP -144100 SOLO_EPD_SIS_ASW -144111 SOLO_EPD_SIS_SW -144112 SOLO_EPD_EPT-HET_MY -144121 SOLO_EPD_EPT-HET_PY -144122 The remainder of the name is an underscore character followed by the unique name of the data item. For example, the EPD HRI LYA boresight direction in the SOLO_EPD_STEP frame (see [2]) is specified by: INS-144100_BORESIGHT The upper bound on the length of the name of any data item identifier is 32 characters. If the same item is included in more than one file, or if the same item appears more than once within a single file, the latest value supersedes any earlier values. Overview ----------------------------------------------------------------------------- From [5]: The Energetic Particle Detector (EPD) suite consists of four sensor types measuring electrons, protons, and ions from helium to iron, and operating at partly overlapping energy ranges from 2 keV up to 200 MeV/n. The EPD sensors are: - Suprathermal Electron Proton (STEP) - Suprathermal Ion Spectrograph (SIS) - Electron Proton Telescope (EPT) - High Energy Telescope (HET) The overall energy coverage achieved with the EPD sensors is 0.002 MeV to 20 MeV for electrons, 0.003 MeV to 100 MeV for protons, 0.05 MeV/n to 200 MeV/n for heavy ions (species-dependent). This energy and species coverage well satisfies and for a large part exceeds the requirements defined for EPD in the Solar Orbiter Payload Definition Document and in the report of the Joint Science and Technology Definition Team (JSTDT) for the Solar Orbiter/Sentinels mission. Measurement principle: ~~~~~~~~~~~~~~~~~~~~~~ STEP relies on a magnetic deflection system in one of the two detector units to suppress electrons in that particular unit. The particles are measured by the use of solid-state detectors with ultra-thin ohmic contacts. SIS applies the time-of-flight by energy technique to measure the composition of ions. EPT relies on the magnet/foil-technique in order to separate electrons from protons and heavier ions. HET is based on the multiple dE/dx vs. total E technique. Mounting Alignment ----------------------------------------------------------------------------- Refer to the latest version of the Solar Orbiter Frames Definition Kernel (FK) [4] for the EPD reference frame definitions and mounting alignment information. EPD Apparent Field-of-View Layout ----------------------------------------------------------------------------- The Field of View (FoV) is that portion of the sky that is covered by the cross-sectional area spanned by the triggering detector and the front defining detector or aperture of the various EPD sensors. Depending on the EPD sensor, its cross section can be either circular or rectangular. EPD SIS has a circular FoV of 22 degrees, EPD EPT a circuilar FoV of 30 degrees and EPD HET a circular FoV of 43 degrees. They all have Sun and Anti-Sun directions therefore the FoVs are duplicated. This section provides a diagram illustrating the EPD STEP apparent FOV layout in the corresponding reference frame. ^ +Ystep | | --- +---------|---------+ ^ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 54 degrees | x-------------> +Zstep | | +Xstep | | | | | | | | | | | | | | | | | | | V | | --- +-------------------+ | 26 degrees | Boresight (+X axis) |<----------------->| is into the page | | FOV Definition --------------------------------------------------------------------------- TODO: EPT should have 2 more FOV each. This section contains definitions for the EPD apparent FOVs. These definitions are provided in the format required by the SPICE TOOLKIT function GETFOV. The FoV definitions correspond to the NAIF Body Names: SOLO_EPD_STEP, SOLO_EPD_SIS_ASW, SOLO_EPD_SIS_SW, SOLO_EPD_EPT_MY, SOLO_EPD_EPT_PY, SOLO_EPD_HET_MY and SOLO_EPD_HET_PY. \begindata INS-144100_NAME = 'SOLO_EPD_STEP' INS-144100_BORESIGHT = ( 1.000 0.000 0.000 ) INS-144100_FOV_FRAME = 'SOLO_EPD_STEP' INS-144100_FOV_SHAPE = 'RECTANGLE' INS-144100_FOV_CLASS_SPEC = 'ANGLES' INS-144100_FOV_REF_VECTOR = ( 0.000 1.000 0.000 ) INS-144100_FOV_REF_ANGLE = ( 27.00000 ) INS-144100_FOV_CROSS_ANGLE = ( 13.00000 ) INS-144100_FOV_ANGLE_UNITS = 'DEGREES' INS-144111_NAME = 'SOLO_EPD_SIS_ASW' INS-144111_BORESIGHT = ( 1.000, 0.000, 0.000 ) INS-144111_FOV_FRAME = 'SOLO_EPD_SIS_ASW' INS-144111_FOV_SHAPE = 'CIRCLE' INS-144111_FOV_CLASS_SPEC = 'ANGLES' INS-144111_FOV_REF_VECTOR = ( 0.000, 1.000, 0.000 ) INS-144111_FOV_REF_ANGLE = ( 11.000 ) INS-144111_FOV_ANGLE_UNITS = 'DEGREES' INS-144112_NAME = 'SOLO_EPD_SIS_SW' INS-144112_BORESIGHT = ( 1.000, 0.000, 0.000 ) INS-144112_FOV_FRAME = 'SOLO_EPD_SIS_SW' INS-144112_FOV_SHAPE = 'CIRCLE' INS-144112_FOV_CLASS_SPEC = 'ANGLES' INS-144112_FOV_REF_VECTOR = ( 0.000, 1.000, 0.000 ) INS-144112_FOV_REF_ANGLE = ( 11.000 ) INS-144112_FOV_ANGLE_UNITS = 'DEGREES' INS-144123_NAME = 'SOLO_EPD_EPT_MY' INS-144123_BORESIGHT = ( 1.000, 0.000, 0.000 ) INS-144123_FOV_FRAME = 'SOLO_EPD_EPT-HET_MY' INS-144123_FOV_SHAPE = 'CIRCLE' INS-144123_FOV_CLASS_SPEC = 'ANGLES' INS-144123_FOV_REF_VECTOR = ( 0.000, 1.000, 0.000 ) INS-144123_FOV_REF_ANGLE = ( 15.000 ) INS-144123_FOV_ANGLE_UNITS = 'DEGREES' INS-144124_NAME = 'SOLO_EPD_EPT_PY' INS-144124_BORESIGHT = ( 1.000, 0.000, 0.000 ) INS-144124_FOV_FRAME = 'SOLO_EPD_EPT-HET_PY' INS-144124_FOV_SHAPE = 'CIRCLE' INS-144124_FOV_CLASS_SPEC = 'ANGLES' INS-144124_FOV_REF_VECTOR = ( 0.000, 1.000, 0.000 ) INS-144124_FOV_REF_ANGLE = ( 15.000 ) INS-144124_FOV_ANGLE_UNITS = 'DEGREES' INS-144125_NAME = 'SOLO_EPD_HET_MY' INS-144125_BORESIGHT = ( 1.000, 0.000, 0.000 ) INS-144125_FOV_FRAME = 'SOLO_EPD_EPT-HET_MY' INS-144125_FOV_SHAPE = 'CIRCLE' INS-144125_FOV_CLASS_SPEC = 'ANGLES' INS-144125_FOV_REF_VECTOR = ( 0.000, 1.000, 0.000 ) INS-144125_FOV_REF_ANGLE = ( 21.500 ) INS-144125_FOV_ANGLE_UNITS = 'DEGREES' INS-144126_NAME = 'SOLO_EPD_HET_PY' INS-144126_BORESIGHT = ( 1.000, 0.000, 0.000 ) INS-144126_FOV_FRAME = 'SOLO_EPD_EPT-HET_PY' INS-144126_FOV_SHAPE = 'CIRCLE' INS-144126_FOV_CLASS_SPEC = 'ANGLES' INS-144126_FOV_REF_VECTOR = ( 0.000, 1.000, 0.000 ) INS-144126_FOV_REF_ANGLE = ( 21.500 ) INS-144126_FOV_ANGLE_UNITS = 'DEGREES' \begintext Platform ID ----------------------------------------------------------------------------- This number is the NAIF instrument ID of the platform on which the channels are mounted. For all channels this platform is the spacecraft. \begindata INS-144500_PLATFORM_ID = ( -144000 ) \begintext End of IK file.