The Venus Express (VEx) Analyzer of Space Plasmas and EneRgetic Atoms, 4th
edition (ASPERA-4) ELectron Spectrometer (ELS) Background data bundle.
This bundle was produced with funding from NASA Planetary Data Archiving,
Restoration and Tools (PDART) 2016, grant #NNX17AL04G.
This bundle contains several collections, each of which is briefly described
below:
document: Documents that should be considered required reading
for this bundle. There are three documents in this collection:
VEX_ASPERA-4_ELS_Spec - This is the Software Interface Specification
(SIS) document. It describes the archive contents and structure,
including file naming conventions, LID formulation, standards
used, and details of the data products and their formats.
VEX_ASPERA-4_ELS_Background_Data_Examples - This document explains
background and gives an example of a background data file and
the affect of background correction in analysis.
VEX_ASPERA-4_ELS_Description - This document describes and gives
full explanation of the ELS background - how the background is
determined and how to apply background corrections. In addition,
this document gives a full description of how to convert from
the differential number flux units of the data in this archive
to other physical quantities.
data_derived: This collection contains the VEx ELS derived data products,
which includes the following:
ELS05BK - The 5-minute averages and standard deviations of the ELS
background per sector (16 sectors total) and the 5-minute
average and standard deviation of the ELS anode (all sectors).
This data product is organized as an ASCII table with 34 columns,
16 sector averages + 16 sector standard deviations + anode
average + anode standard deviation.
ELSHRBCNF - The ELS High Range Background Corrected differential Number
Flux data per sector (16 sectors total). The High Range refers to
the ELS high energy levels given in eV. This data product is in
ASCII Comma Separated Values (CSV) where there are 16 rows (one for
each sector) per time period (or sweep). Nothing written between
commas (e.g. ",,") represents a fill value.
ELSLRBCNF - The ELS Low Range Background Corrected differential Number
Flux data per sector (16 sectors total). The Low Range refers to
the ELS low energy levels given in eV. This data product is in
ASCII Comma Separated Values (CSV) where there are 16 rows (one for
each sector) per time period (or sweep). Nothing written between
commas (e.g. ",,") represents a fill value.
ELSHRTHR - The ELS High Range THReshold data per sector (16 sectors
total). This is the 1-count differential number flux threshold
necessary to reconstruct the background corrected differential
number flux spectrum. The High Range refers to the ELS high energy
levels given in eV. This data product is in ASCII Comma Separated
Values (CSV) where there are 16 rows (one for each sector) per
time period (or sweep). Nothing written between commas (e.g. ",,")
represents a fill value.
ELSLRTHR - The ELS Low Range THReshold data per sector (16 sectors
total). This is the 1-count differential number flux threshold
necessary to reconstruct the background corrected differential
number flux spectrum. The Low Range refers to the ELS low energy
levels given in eV. This data product is in ASCII Comma Separated
Values (CSV) where there are 16 rows (one for each sector) per
time period (or sweep). Nothing written between commas (e.g. ",,")
represents a fill value.
data_raw: This collection contains the VEx ELS raw data products, which
includes the following:
ELSHRCNTS - The ELS High Range raw CouNTS data per sector (16 sectors
total). The High Range refers to the ELS high energy levels given
in eV. This data product is in ASCII Comma Separated Values (CSV)
where there are 16 rows (one for each sector) per time period (or
sweep). Nothing written between commas (e.g. ",,") represents a
fill value.
ELSLRCNTS - The ELS Low Range raw CouNTS data per sector (16 sectors
total). The Low Range refers to the ELS low energy levels given
in eV. This data product is in ASCII Comma Separated Values (CSV)
where there are 16 rows (one for each sector) per time period (or
sweep). Nothing written between commas (e.g. ",,") represents a
fill value.
data_eng: This collection contains the VEx ELS engineering data products
needed for science analysis, which includes the following:
ELSHRSTPS - The ELS High Range energy STePS in eV for each ELS sector
(16 sectors total). These are the center energy steps (in electron
volts, eV) at which each data value is measured per ELS sector and
map directly to the science data (both derived and raw). This data
product is in ASCII Comma Separated Values (CSV) where there are
16 rows (one for each sector) per time period.
ELSLRSTPS - The ELS Low Range energy STePS in eV for each ELS sector
(16 sectors total). These are the center energy steps (in electron
volts, eV) at which each data value is measured per ELS sector and
map directly to the science data (both derived and raw). This data
product is in ASCII Comma Separated Values (CSV) where there are
16 rows (one for each sector) per time period.
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