Version:2.4.0
NumericalData
ResourceID
spase://CNES/NumericalData/CDPP-Archive/VEX/ASPERA4/VEX_ASPERA4_IMA
ResourceHeader
ResourceName
VENUS EXPRESS: ASPERA-4 IMA Ion Mass Analyzer Science Data (CDF)
DOI
https://doi.org/10.24400/802406/tmk4-m7ch
ReleaseDate
2022-06-06 17:35:00Z
Description
This data set contains Particles (counts/accumulation) counted in the current azimuth, mass, energy and polar angle sector. Within the azimuth mass energy polar-angle matrix, particle counts are displayed as acquired with the first index varying fastest and depends on the operational mode.
Acknowledgement
Please acknowledge the Principal Investigator(s) as well as the ESA Planetary Science Archive and the CDPP (Centre des Données de la Physique des Plasmas) when making a publication using the data you are going to download.
Principal Investigator(s): S. Barabash (IRF, Kiruna, Sweden)
Contacts
AccessInformation
RepositoryID
Availability
Online
AccessURL
Name
REGARDS
URL
Description
Access via CNES Data Archive for CDPP
Format
CDF
InstrumentIDs
MeasurementType
EnergeticParticles
TemporalDescription
TimeSpan
StartDate
2005-12-09 00:00:00Z
StopDate
2014-11-27 00:00:00Z
ObservedRegion
Venus.Magnetosphere
Parameter #1
Name
Synchronization words for new Experiment
Description
The 3 bytes 0xE3 0x31 0xCA mark the start of anew Experiment Data Format. A search for this is required as the EDF s floats in the TM data stream.
Support
SupportQuantity
InstrumentMode
Parameter #2
Name
Experiment unit
Description
This parameter defines the experiment unit.The field takes one of the following values: 0 (undefined) 1 (ICA) 2 (IMA MEX) 3 (IMA VEX).
Support
SupportQuantity
InstrumentMode
Parameter #3
Name
Reduction Mode Index
Description
This is the data reduction mode index used for the data in this EDF. The field takes one of the following values: 0, 2, 4, 5, or any values included in the range 8 to 35.
Support
SupportQuantity
InstrumentMode
Parameter #4
Name
Experiment Data Format Counter
Description
This is an running counter incremented by 1 for each released EDF. It swaps over to 0 after 255.
Support
SupportQuantity
InstrumentMode
Parameter #5
Name
Number of sets in minimun mode
Description
This parameter gives the number of sets in this EDF for the minimum modes.
Support
SupportQuantity
InstrumentMode
Parameter #6
Name
Checksum 1 failure
Description
This flag will set if the checksum 1 fails during RAM booting. Sets from both PROM and EEPROM booting
Support
SupportQuantity
InstrumentMode
Parameter #7
Name
Checksum 0 failure
Description
This flag will set if the checksum 0 fails during RAM booting. Sets from both PROM and EEPROM booting
Support
SupportQuantity
InstrumentMode
Parameter #8
Name
Tm Fifo Emptied
Description
This bit will set if the TM FIFO is emptied before the start of this EDF. Always forced to and from special EDF s.
Support
SupportQuantity
InstrumentMode
Parameter #9
Name
HV ramping in progress
Description
This flag will set if HV ramping has been performed during the data taking for this EDF.
Support
SupportQuantity
InstrumentMode
Parameter #10
Name
Test Pattern
Description
For testing purposes a number of imager test patterns can be commanded. This parameter gives the actual test pattern number used. Ensure it is 0 for real scientific data.
Support
SupportQuantity
InstrumentMode
Parameter #11
Name
Post acceleration level
Description
This flag gives the post acceleration level used for this format. The field takes one of the following values: 0 = Low 1 = High
Support
SupportQuantity
InstrumentMode
Parameter #12
Name
Post acceleration mode
Description
This flag indicates the post acceleration mode. If set (1) it is alternating else it is fixed.
Support
SupportQuantity
InstrumentMode
Parameter #13
Name
Post-acceleration high level reference value
Description
This parameter gives the post-acceleration high level reference value. It is retrieved from the accompanied PAHLR.asc file in the time range where applicable, if not it is set by default to 6.0. The post-acceleration index can be any value between 0 to 7. But calibration information exists only for post-acceleration index = 0, 3, 6. The calibrated values are: 0 : 39 Volts 3 : 1902 Volts 6 : 3615 Volts
Support
SupportQuantity
InstrumentMode
Parameter #14
Name
Automatic Data Reduction Switch
Description
This flag indicates whether automatic data reduction change is enabled or not. 0 = Disabled 1 = Enabled
Support
SupportQuantity
InstrumentMode
Parameter #15
Name
Data compression flag
Description
This flag indicates whether data compression is enabled or not. 0 = Disabled 1 = Enabled
Support
SupportQuantity
InstrumentMode
Parameter #16
Name
Number of link packets
Description
This gives the approximate number of 1355 link packets in the TM FIFO. To convert to words, unpack the F8 code and multiply by 3.
Support
SupportQuantity
InstrumentMode
Parameter #17
Name
Program Code in RAM
Description
This parameter gives the program code currently loaded and running in RAM. It is coded as: 0 = PROM 1-16 = EEPROM section 0-15
Support
SupportQuantity
InstrumentMode
Parameter #18
Name
Sample Processing Overrun flag
Description
This flag is set if a process overruns, i.e. the current data processing is not finished when a new is requested.
Support
SupportQuantity
InstrumentMode
Parameter #19
Name
Sweep Processing Overrun flag
Description
This flag is set if a process overruns, i.e. the current data processing is not finished when a new is requested.
Support
SupportQuantity
InstrumentMode
Parameter #20
Name
Post Processing Overrun flag
Description
This flag is set if a process overruns, i.e. the current data processing is not finished when a new is requested.
Support
SupportQuantity
InstrumentMode
Parameter #21
Name
Energy start index
Description
This parameter gives the energy start index when in the 32 level energy mode.
Support
SupportQuantity
InstrumentMode
Parameter #22
Name
Reset Error flag
Description
This flag will set if the experiment has rebooted due to watchdog or machine error reset.
Support
SupportQuantity
InstrumentMode
Parameter #23
Name
Format start time
Description
This parameter is the starting time of the EDF. Note that more significant bits must be taken from the ESA packet time. Some attention should be paid close in time when this 3 bytes counter swaps around. That happens at about once per 6 days.
Support
SupportQuantity
InstrumentMode
Parameter #24
Name
Format length
Description
This parameter gives the total length of the format (EDF) in words.
Support
SupportQuantity
InstrumentMode
Parameter #25
Name
Shadow masking switch flag
Description
This flag indicates if imager data is masked (set to zero) or not for angles that are regarded as obscured by other S/C items. 0 = Disabled 1 = Enabled.
Support
SupportQuantity
InstrumentMode
Parameter #26
Name
HV Masking Switch flag
Description
This bit indicates if imager data is masked (set to zero) or not for angles/energies that can not be reached due to insufficient or too inaccurate HV. 0 = Disabled 1 = Enabled.
Support
SupportQuantity
InstrumentMode
Parameter #27
Name
Decompression error flag
Description
Error during data decompression process
If this parameter is not equal to 0, the data decompression process is invalid.
Support
SupportQuantity
InstrumentMode
Parameter #28
Name
Mission phase
Description
The CRUISE sub-phase corresponds to data collected before the VOI (VENUS Orbit Injection), including the Near Earth Verification (NEV) and Interplanetary Cruise (IC) sub-phases. After the VOI, the nominal mission is divided into different VENUS mission sub-phases defined by the VENUS EXPRESS mission planning.
Support
Parameter #29
Name
Orbit number
Description
Orbit number
Support
Parameter #30
Name
Orbital Eccentricity
Description
Orbital Eccentricity
Support
Parameter #31
Name
Orbital Inclination
Description
Orbital Inclination
Support
Parameter #32
Name
Orbital Semimajor Axis
Description
Orbital Semimajor Axis
Support
Parameter #33
Name
Periapsis Altitude
Description
Periapsis Altitude
Support
Parameter #34
Name
Periapsis Argument Angle
Description
Periapsis Argument Angle
Units
°
UnitsConversion
0.0174532925>rad
Support
Parameter #35
Name
Periapsis Time in milliseconds
Description
Periapsis Time in milliseconds.
The time of periapsis passage is the time when the satellite reaches periapsis.
Time base: J2000
Time scale: Terrestrial Time
Units
ms
UnitsConversion
1.0e-3>s
Support
Parameter #36
Name
Spacecraft Orientation
Description
The SPACECRAFT_ORIENTATION element defines the Venus Express direction of flight with respect to its spacecraft reference frame. The direction of flight is given as a 3-tuple (x,y,z). The paragraph below describes how to derive the (x,y,z) values. When the spacecraft is in nadir pointing mode, the +Z axis points towards the centre of Venus and the +X axis is perpendicular to the ground track. Unlike Mars Express, the speed vector of the spacecraft can be tilted from the +Y axis direction at an angle a. The 3-tuple (x, y, z) defines the coordinates of the normalised spacecraft speed vector. As a consequence, we have: x = sin a y = cos a
Support
SupportQuantity
Orientation
Parameter #37
Name
VEX ASPERA4/IMA Azimuth
Description
VEX ASPERA4/IMA azimuth table
Units
°
UnitsConversion
0.0174532925>rad
Support
Parameter #38
Name
VEX ASPERA4/IMA Mass
Description
VEX ASPERA4/IMA Mass table
Support
Parameter #39
Name
VEX ASPERA4/IMA Ion Energy
Description
VEX ASPERA4/IMA Ion Energy table
Units
eV
UnitsConversion
1.160445e4>K
Support
Parameter #40
Name
VEX ASPERA4/IMA Elevation
Description
VEX ASPERA4/IMA elevation table
Units
°
UnitsConversion
0.0174532925>rad
Support
Parameter #41
Name
VEX ASPERA4/IMA Particles counts
Description
VEX ASPERA4/IMA Particles (counts/accumulation) counted in the current azimuth, mass, energy and polar angle sector.
Particle
ParticleType
Ion
ParticleQuantity
Counts
EnergyRange
Low
10
High
36000
Units
eV
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