A dataset provided by the European Space Agency

URL ftp://npsa01.esac.esa.int/pub/mirror/VENUS-EXPRESS/ASPERA4/VEX-V-SW-ASPERA-2-EXT2-IMA-V1.0
DOI https://doi.org/10.5270/esa-wzpde9s
Abstract This data set contains Venus Express ASPERA-4 Ion Mass Analyzer (IMA) data that have been acquired during the extended mission phase 2. The data are provided in raw units of counts/accumulation.
Description Data Set Overview: This data set contains data collected by the Ion Mass Analyzer (IMA) flown onboard the VENUS EXPRESS satellite during the extended mission phase 2. The data are stored in ascending time order with respect to the sequential in-flight data acquisition. The data (science and HK) in this archive are in standard PDS format and are both organized into fixed-width tabular objects, an ASCII format with data store in rows and columns. Mainly 27 modes are physically producing science data during nominal mission. Depending upon the science mode selected, data information may be reduced aboard the spacecraft by integrations in the measured parametric space azimuth x mass x energy x polar-angles. The resulting size of the data table objects may therefore vary with respect to the applicable mode. To maintain the fixed-width table structure, science data records of a same type of sampling are grouped into a same data product, and formatted and stored as row vectors within a data table object. Each row of the storage table consists of a series of particle counts that are collected and compressed while scanning the entire parametric space of one complete cycle of measurements. The size of the table width is strictly tied to the science mode selected. Thus 27 types of data are present, one for each selected operation mode. An additional IMA header, common to all IMA modes, is inserted before each data cycle-dependent collection. Instrument Description: = The Ion Mass Analyzer (IMA) provides in situ ion measurements in a selectable energy range 10 eV to 30 keV/q for the main ion components (1, 2, 4, 16 amu/q) and the group of molecular ions (20 - 80 amu/q) to help satisfy the following scientific objectives: 1. Determine the instantaneous global distributions of plasma and neutral gas near Venus by providing undisturbed solar wind parameters 2. Define the local characteristics...
Instrument ASPERA4
Temporal Coverage 2009-06-01T00:26:41Z/2009-09-01T04:17:51Z
Version V1.0
Mission Description Mission Overview Venus Express is ESA's first mission to Venus. It reuses the design of the Mars Express spacecraft. Many of the instruments are simply upgraded versions of those developed for ESA's Mars Express and Rosetta missions. The scientific objectives of the mission is to study the atmosphere, the plasma environment, and the surface of Venus in great detail. Venus Express was launched by a Soyuz-Fregat launcher from the Baikonour Cosmodrome on 9 November 2005. After separation, Venus Express, of mass 1244 kg,was placed into an interplanetary transfer orbit during approximately 150 days. After a 153 day cruise to Venus the spacecraft entered Venusian orbit on 11 april 2006. The first capture orbit was an eccentric polar and lasted 9 days. Several manoeuvres over the period 15 April-6 May 2006 lowered the spacecraft into its operational orbit: a 24-hour elliptical, quasi-polar orbit. The pericentre altitude is 250 kms and the apocentre altitude is 66000 kms. Pericentre altitude 250 km Apocentre altitude 66000 km Period 24 h Inclination ~90 deg Pericentre latitude 80 deg The mission has been described in many papers [ESABUL2005; HUNTER2004]. Details about the mission launch sequence and timeline can be obtained from the Mission Calendar [VEX-ESC-TN-5002] and from the Consolidated Report on Mission Analysis (CREMA)[VEX-ESC-RP-5500]. Mission Phases The mission timeline defines the different spacecraft and payload operations required per phase to prepare the spacecraft for Venus operational orbit acquisition, science data acquisition and transmission. Six nominal mission phases plus the pre-launch phase are defined for achieving the scientific mission objectives. They are detailed below. PRELAUNCH --------- Pre-launch operations started approximately 6 months before the launch and covered the period from delivery of the spacecraft to the launch site until L-8 hrs in the launch countd...
Creator Contact EMMANUEL PENOU
Date Published 2010-12-10
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2010-12-10, VEX-V-SW-ASPERA-2-EXT2-IMA, V1.0. https://doi.org/10.5270/esa-wzpde9s