Wind and Temperature Intermediate Data from the Wind and Temperature Spectrometer (WATS) Experiment on Dynamics Explorer-2

Federal Geographic Data Committee (FGDC) Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: NASA
Publication_Date: Unknown
Title: Wind and Temperature Intermediate Data from the Wind and Temperature Spectrometer (WATS) Experiment on Dynamics Explorer-2
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Online_Linkage: http://nssdc.gsfc.nasa.gov/
Description:
Abstract:
The Wind and Temperature (WATS) experiment on the Dynamics Explorer-2 (DE-2) spacecraft consists of a closed source neutral mass spectrometer with two rectangular baffles which are swept across the incoming neutral beam. The modulation of the neutral flux by the baffles allows measurement of the temperature and gas velocity. The mass was commandable and was usually selected to be N2 or O. The data set consists of neutral density temperature and vertical and zonal winds for atomic mass number 28 and 16 (measured as 32). One or two of these masses may be measured at the same time, but any differences in the temperature or wind is thought to be due to experimental error with the greatest error in the mass 16 measurements. The data are called 'intermediate' because there are corrections that need to be applied in order to produce a final data set. The corrections are not fully understood at this time and new corrections may sometimes be necessary. The value of the intermediate data set is that it contains the original data without any loss of resolution and it may be used, as is, for spectral analysis and by other investigators who have already included in their programs some of the correction factors. When new correction factors are calculated they are sent to investigators instead of sending a new data set. Each record in the data set consists of 11 4-byte words in binary format as follows: WORD TYPE CONTENTS 1 integer julian date 2 integer time in milliseconds 3 integer mode (3 or 4)=horizontal (5 or 6)=vertical 4 integer out/in flag 1=baffle going out 2=baffle going in 5 integer mass in amu - usually 28 or 32 6 real number density (number/cc) 7 real temperature (deg k) 8 real velocity (m/s) spacecraft coordinates 9 binary engineering bits 10 binary engineering bits 11 real velocity (m/s) geographic coordinates The resolution is 2 4 6 or 8 seconds depending upon how many of the two second measurements are repeated in the eight second measurement cycle. A routine mode was two horizontal and two vertical measurements which would give a time spacing of 2 6 2 6 2 6 .... seconds for the velocity and a resolution of 2 seconds for the temperature which is obtained from both baffles. For higher time resolution in density and composition information the DE-2 NACS measurements should be used. The error in the temperature is about 3% at an altitude of 250 km and it increases with altitude proportional to the inverse of the square root of the density of the mass being measured. Since the error increases as the atmospheric density of the measured gas decreases, the mass was usually selected to be the dominant species. The error in the velocities is about 10 meters/second at 250 km with the same altitude dependence as in the temperature. In addition to this statistical error, there is an uncertainty of about 24 meters/second in the velocity due to errors in angle sensing of the baffle arm. The original version consists of data in the DE Sigma-9 tape library with the velocity in spacecraft coordinates. A data tape contains one file per satellite pass and is unsorted in time. The version described here contains velocities in geographical coordinates and is sorted in time. For more information, background and access to data, see: http://nssdc.gsfc.nasa.gov/space/ The three PI-generated WATS data tapes are available from NSSDC (81-070B-04C). In addition NSSDC distributes the DE-2 Unified Abstract (UA) tape which includes data from the NACS, WATS, LANG, FPI, RPA and IDM instruments at 16 second time resolution (81-070B-04D). The orbit/attitude files and associated software are included on the UA tape, but not on the MAF tapes. The variability of thermospheric and ionospheric parameters measured by NACS, WATS and LANG is illustrated in a computer generated movie that is available from NSSDC on video tape (81-070B-04A) or on 16mm film (81-070B-04B). See: http://nssdc.gsfc.nasa.gov/
Purpose:
Not Available
Supplemental_Information:
REFERENCE: Spencer, N.W., L. E. Wharton, H. B. Niemann, A. E. Hedin, G. R. Carignan, and J. C. Maurer, The Dynamics Explorer wind and temperature spectrometer, Space Science Instrumentation, 5, 417-428, 1981.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19810805
Ending_Date: 19830218
Currentness_Reference:Unknown
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: -180.0
East_Bounding_Coordinate: 180.0
North_Bounding_Coordinate: 90.0
South_Bounding_Coordinate: -90.0
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword_Thesaurus: GCMD PLATFORM
Theme_Keyword_Thesaurus: GCMD INSTRUMENT
Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS
Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY
Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY > TRACE GASES/TRACE SPECIES
Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WINDS > UPPER LEVEL WINDS
Theme_Keyword: EARTH SCIENCE > SPECTRAL/ENGINEERING > PLATFORM CHARACTERISTICS > ATTITUDE CHARACTERISTICS
Theme_Keyword: EARTH SCIENCE > SPECTRAL/ENGINEERING > PLATFORM CHARACTERISTICS > ORBITAL CHARACTERISTICS
Theme_Keyword: EARTH SCIENCE > SUN-EARTH INTERACTIONS > SOLAR ENERGETIC PARTICLE PROPERTIES > PARTICLE DENSITY
Theme_Keyword: EARTH SCIENCE > SUN-EARTH INTERACTIONS > SOLAR ENERGETIC PARTICLE PROPERTIES > PARTICLE SPEED
Theme_Keyword: EARTH SCIENCE > SUN-EARTH INTERACTIONS > SOLAR ENERGETIC PARTICLE PROPERTIES > PARTICLE TEMPERATURE
Theme_Keyword: EARTH SCIENCE > SUN-EARTH INTERACTIONS > SOLAR ENERGETIC PARTICLE FLUX > NEUTRAL PARTICLE FLUX
Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY > NITROGEN COMPOUNDS > MOLECULAR NITROGEN
Theme_Keyword: EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY > OXYGEN COMPOUNDS > MOLECULAR OXYGEN
Theme_Keyword: DE-2 > DYNAMICS EXPLORER-2
Theme_Keyword: SPECTROMETERS
Theme_Keyword: WATS > WIND AND TEMPERATURE SPECTROMETER
Theme_Keyword: Ionospheric Science
Theme_Keyword: Space Physics
Theme_Keyword: Thermospheric Studies
Theme_Keyword: CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
Theme_Keyword: GEOSCIENTIFIC INFORMATION
Place:
Place_Keyword_Thesaurus: GCMD
Place_Keyword: GEOGRAPHIC REGION > GLOBAL
Place_Keyword: VERTICAL LOCATION > IONOSPHERE
Place_Keyword: VERTICAL LOCATION > THERMOSPHERE
Access_Constraints: Not Available
Use_Constraints:
Not Available
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: DIETER BILITZA
Contact_Position: TECHNICAL CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: NASA
Address: Goddard Space Flight Center
Address: Mailstop 672.0
City: Greenbelt
State_or_Province: MD
Postal_Code: 20771
Country: USA
Contact_Voice_Telephone: 301-286-0190
Contact_Facsimile_Telephone: 301-286-1771
Contact_Electronic_Mail_Address: Dieter.Bilitza-1@nasa.gov
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Not Available
Logical_Consistency_Report:
Not Available
Completeness_Report:
Not Available
Lineage:
Process_Step:
Process_Description:
Not Available
Process_Date: Unknown
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Spatial_Reference_Information:
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NASA/GSFC/SSDOO/NSSDC > National Space Science Data Center, Space Science Data Operation Office, Goddard Space Flight Center, NASA
Contact_Person: DIETER BILITZA
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: NASA
Address: Goddard Space Flight Center
Address: Mailstop 672.0
City: Greenbelt
State_or_Province: MD
Postal_Code: 20771
Country: USA
Contact_Voice_Telephone: 301-286-0190
Contact_Facsimile_Telephone: 301-286-1771
Contact_Electronic_Mail_Address: Dieter.Bilitza-1@nasa.gov
Resource_Description: 81-070B-04A,B,C,D
Distribution_Liability:
Not Available
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Not Available
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://nssdc.gsfc.nasa.gov/
Access_Instructions:
DATA CENTER URL
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://ftpbrowser.gsfc.nasa.gov/ae_de2_s.html
Access_Instructions:
Access to WATS and other Dynamics Explorer Data
Fees: Not Available
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Metadata_Reference_Information:
Metadata_Date:
Metadata_Review_Date: 20080528
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: GCMD User Support Office
Contact_Organization: NASA Global Change Master Directory
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Not Available
City: Lanham
State_or_Province: MD
Postal_Code: 20706
Country: USA
Contact_Voice_Telephone: Not Available
Contact_Electronic_Mail_Address: gcmduso@gcmd.gsfc.nasa.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
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