A dataset provided by the European Space Agency

URL ftp://npsa01.esac.esa.int/pub/mirror/VENUS-EXPRESS/ASPERA4/VEX-V-SW-ASPERA-2-ELS-V1.0
DOI https://doi.org/10.5270/esa-mv88j95
Abstract This data set contains Venus Express ASPERA-4 Electron Spectrometer (ELS) data that have been acquired for the nominal mission phase between launch (November 9, 2005) and the October 2, 2007. The data are provided in raw units of counts/accumulation.
Description Data Set Overview: This data set contains data collected by the Electron Spectrometer (ELS) flown onboard the VENUS EXPRESS satellite during the nominal mission phase. 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 2 types of science data are present, one for each selected operation mode (engineer and sciences mode). One data product is designed for containing engineering data, while the data from the science mode are splitted and stored into appropriate electron counting data files according to the data acquisition mode and the operating sample size (the number of energy bins and angular sectors) of the instrument, in order to maintain fixed width table structure within each data product. The number of rows within the tables is variable and depends roughly on the number of records contained in the associated telemetry packet. An ELS header, for both engineering and electron counting modes, is added before each data mode-dependent collection. Instrument Description: = The Electron Spectrometer (ELS) provides in situ electron measurements in the energy range 10 eV to 20 keV 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 of the main plasma regions 3. Complement the ENA images In addition, there are 16 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 fiel...
Instrument ASPERA4
Temporal Coverage 2005-12-09T13:00:00Z/2006-09-01T15:12:09Z
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 2010-06-07
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2010-06-07, VEX-V-SW-ASPERA-2-ELS, V1.0. https://doi.org/10.5270/esa-mv88j95