This description file gives the definition for the OBSERVATION_TYPE keyword values. Version 1.0 21/07/2006, Written by Maud Barthelemy 24/03/2008, Modified by Maud Barthelemy The possible values for OBSERVATION_TYPE keyword are: AD001A, AD001B, AD001C, AD002A, AD003A, AD004A, AD004B, AD005A, AD006A, AD007A, AD008A, AD009A, AD010A, AD011A, AD012A, AD013A, AD014A, AD014B, AS001A, AS001B, AS001C, AS001D, AS002A, AS003A, AS003B, AS004A, AS004B, AC001A, AC001B, AC001C, AC002A, AC002B, AC003A, AC003B, AC004A, AC004B, AC005A, AC005B, AC006A, AC006B, AC007A, AC007B, AC008A, AC008B, AC009A, CL001A, CL002A, CL003A, CL004A, CL004B, CL004C, CL005A, RB001A, RB002A, RB003A, RB004A, SF001A, SF002A, SF003A, SF004A, SF005A, PE001A, PE001B, PE002A, PE003A, PE004A, PE004B, PE005A. I. ATMOSPHERIC DYNAMICS 1) Dynamics of the upper atmosphere sco. Temperature and wind distribution AD001A Solar occulation (SPICAV/SOIR) AD001B Stellar occultation (SPICAV) AD001C Mapping airglows of trace gases (SPICAV) 2) Dynamics of the middle atmosphere sco. Global circulation AD002A Tracking of UV features at the cloud top (VIRTIS) AD003A Temperature sounding in 15 um and 4.3 um CO2 bands (pfs, virtis) Radio occultations (VeRa) AD004A Mapping the airglow in nadir geometry (VIRTIS,VMC) AD004B Mapping the airglow in limb geometry (VIRTIS,VMC) sco. Small scale dynamics and wave phenomena AD005A High spatial resolution imaging of the cloud tops and hazes in nadir geometry (SPICAV,VIRTIS, VMC) AD006A High spatial resolution imaging of the cloud tops and hazes in limb geometry (SPICAV,VIRTIS, VMC) AD007A Radio occultations (VeRa) AD008A Spectro-imaging of the non thermal emissions (VIRTIS) sco. Polar phenomena AD009A High spatial resolution imaging of the cloud tops and hazes in nadir geometry (SPICAV,VIRTIS, VMC) AD010A High spatial resolution imaging of the cloud tops and hazes in limb geometry (SPICAV,VIRTIS, VMC) AD011A Radio occultations (VeRa) 3) Dynamics of the lower atmosphere sco. Global circulation AD012A Tracking cloud features in the near-IR (VIRTIS,VMC) AD013A Spectroscopy in the near-IR transparency windows (PFS,SPICAV,VIRTIS,VMC) sco. Temperature structure and atmospheric stability AD014A Radio occultations >40km (VeRa) AD014B Observations in 1 um window on the slopes 0...8km (PFS,SPICAV,VIRTIS,VMC) II.ATMOSPHERIC STRUCTURE 1) Structure of the upper atmosphere sco. Thermal/pressure structure AS001A Solar occultation 80-180km (SPICAV/SOIR) AS001B Stellar occultation 80-180km (SPICAV) AS001C Radio occultation ~100km (VeRa) AS001D Accelerometry 150-200km (Spacecraft) sco. Structure of the ionosphere AS002A Radio occultation 150-600km (VeRa) 2) Structure of the middle atmosphere sco. Temperature structure AS003A Temperature sounding in 15um and 4.3um CO2 bands (PFS,VIRTIS) AS003B Radio occultation (VeRa) 3) Structure of the lower atmosphere sco. Temperature structure and stability parameter AS004A Radio occultation >40km (VeRa) AS004B Surface thermal mapping at 1um along the slopes 0-8km (PFS,SPICAV,VIRTIS,VMC) III. ATMOSPHERIC COMPOSITION AND CHEMISTRY 1) Composition and chemistry of the upper atmosphere sco. Density and composition of the neutral atmosphere AC001A Solar occultation 80-100km (SPICAV/SOIR) AC001B Stellar occultation 80-100km (SPICAV) AC001C Mapping airglows in limb geometry (VIRTIS,VMC) AC002A Mapping airglows in nadir geometry (VIRTIS,VMC) AC002B In situ measurements of energetic neutral atoms (ASPERA) sco Density and composition of the ionosphere AC003A Radio occultation 100-600km (VeRa) AC003B In situ measurements of electrons and ions (ASPERA) 2) Composition and chemistry of the middle atmosphere sco. Composition of the mesosphere AC004A Solar occultation 80-100km (SPICAV/SOIR) AC004B Stellar occulation 80-100km (SPICAV/SOIR) AC005A Nadir spectroscopy/imaging spectroscopy (PFS,SPICAV,VIRTIS,VMC) AC005B Limb measurement (PFS) sco. Cloud formation and gas-cloud interaction AC006A Solar occultation 80-100km (SPICAV/SOIR) AC006B Stellar occultation 80-100km (SPICAV/SOIR) AC007A Mapping spatial distribution of trace gases at the cloud top (PFS,SPICAV, VIRTIS,VMC) AC007B Cloud morphology (PFS,VIRTIS,VMC) 3) Compopsition and chemistry of the lower atmosphere sco. Composition of the lower atmosphere AC008A Spectroscopy in the near-IR "windows" on the nightside (PFS,SPICAV,VIRTIS,VMC) AC008B Radio occultation (VeRa) sco. global circulation AC009A Imaging and spectroscopy in the near-IR "windows" on the nightside (PFS,SPICAV,VIRTIS,VMC) IV. CLOUD LAYER AND HAZES 1)Optical properties and morphology sco. Optical properties, composition and nature of the cloud layer CL001A Imaging and spectroscopy in the near-IR "windows" on the nightside (VIRTIS,VMC) CL002A Spectroscopy and imaging on the dayside (PFS,SPICAV,VIRTIS) CL003A Imaging on the dayside (VIRTIS,VMC) sco. Optical properties, composition and nature of the hazes CL004A Solar occultation (SPICAV/SOIR) CL004B Stellar occultation (SPICAV) CL004CImaging of the limb (VIRTIS,VMC) sco. Search for lighting CL005A Imaging from the nightside (VIRTIS,VMC) V. RADIATIVE BALANCE 1) Global balance sco. Planetary energy balance RB001A Spectroscopy and imaging (PFS,VIRTIS) measurements of radiative fluxes escaping the planet RB002A Spectroscopy and imaging (PFS,VIRTIS) Measurements of temperature and aerosol structure of the mesosphere and at cloud top 2) Greenhouse effect sco. Role of trace gases and cloud opacity RB003A Spectroscopy and imaging in the near-IR "windows" on the nightside (PFS,SPICAV,VIRTIS,VMC) Measurements of the abundance of trace gases in the lower atmosphere RB004A Spectroscopy and imaging in the near-IR "windows" on the nightside (PFS,SPICAV,VIRTIS,VMC) Measurements of cloud total opacity and its variations VI. SURFACE PROPERTIES AND GEOLOGY 1) Surface properties sco. Surface properties SF001A Bi-static radio sounding (VeRa) SF002A Mapping in the near-IR windows at the nightside (PFS,SPICAV,VIRTIS,VMC) sco. Search for active volcanism SF003A Mapping in the near-IR windows at the nightside (PFS,SPICAV,VIRTIS,VMC) SF004A Spectroscopy (PFS,SPICAV,VIRTIS) sco. Search for Venusquakes SF005A Mapping the non-thermal emmissions (VIRTIS) VII. PLASMA ENVIRONMENT AND ESCAPE PROCESSES 1) Plasma and escape sco Plasma evironment and interactions with the solar wind PE001A In situ measurements of neutrals and plasma (ASPERA) PE001B Radio Sounding of the ionosphere (VeRa) PE002A In situ magnetic field measurements (MAG) sco. Solar corona PE003A Radio sounding of the solar corona (VeRa) sco. Escape processes PE004A In situ measurements of neutrals and plasma (ASPERA) PE004B Radio sounding of the ionosphere (VeRa) PE005A Solar occultation Spectroscopy of the upper atmosphere (SPICAV/SOIR)