A dataset provided by the European Space Agency

URL ftp://npsa01.esac.esa.int/pub/mirror/VENUS-EXPRESS/ASPERA4/VEX-V-SW-ASPERA-2-EXT4-NPI-V1.0
DOI https://doi.org/10.5270/esa-t4sk5op
Abstract This data set contains Venus Express ASPERA-4 Neutral Particle Imager (NPI) data that have been acquired during the extended mission phase 4. The data are provided in raw units of counts/accumulation.
Description Data Set Overview: This data set contains data collected by the Neutral Particle Imager (NPI) flown onboard the VENUS EXPRESS satellite during the extended mission phase 4. 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. 2 types of data are present, one for each selected operation mode (normal mode and deflection stepping mode). The tables related to the science data contain particle number counts measured by the active sectors within each sampling time. For those records where sample or anode data values are missing, the field is padded on the right with missing constant values ensuring a 32*32 blank separated value table object per record all along the mission. An NPI header, specific to each mode of observation, is added before the data collection. Instrument Description: = The Neutral Particle Imager (NPI) measures integral ENA fluxes in the energy range 100 eV to 60 keV to help satisfy the following scientific objectives: 1. Determine the instantaneous global distributions of plasma and neutral gas near Venus 2. Energy deposition from the solar wind to the ionosphere In addition, there are 32 sectors for measuring simulteaneously the whole azimuthal range (over 2pi). General notes regarding fields of the data tables: * Strings appear in quotes * Integers, reals and PDS times do not require quotes * If a field is unknown, UNK may be entered * If a field is not applicable, N/A may be entered Data Products: Both data, scientific and housekeeping, are collected in this data set. Processing Science data are uncalibrated, level-stamped as level CODMAC 2, and housekeeping d...
Instrument ASPERA4
Temporal Coverage 2013-01-01T01:49:29Z/2014-05-14T23:59:59Z
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 [ESA2005; HUNTER2004]. Details about the mission launch sequence and timeline can be obtained from the Mission Calendar [DAUVIN2005] and from the Consolidated Report on Mission Analysis (CREMA) [SANCHEZ&RODRIGU2005]. 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. The pre-routine mission phase, which are: - the pre-launch phase - the launch and early orbit phase - the near earth commissioning phase - the interplanetary cruise phase - the venus orbit insertion phase - the venus orbit commissioning phase, the nominal mission phase and the extended mission phases phase are detailed below. PRELAUNCH ---...
Creator Contact EMMANUEL PENOU
Date Published 2011-03-18
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2011-03-18, VEX-V-SW-ASPERA-2-EXT4-NPI, V1.0. https://doi.org/10.5270/esa-t4sk5op