2.2.2 spase://VMO/NumericalData/TWINS1/ENA/L1.PT15M TWINS 1 Neutral-atom L1 Images and Movies 2012-03-10T02:21:11Z TWINS 1 neutral-atom spectrometer level-1 magnetospheric images and image movies at full (9 energy steps and 15 minute) resolution. Images have been smoothed using a technique that provides approximately uniform statistics across the image. Each image has 4x4 degree angular resolution and includes 15 minutes of data. These images are derived on the ground from direct events measurements of the time of flight and detection location on the anode for individual ENAs. Each image has 4x4 degree angular resolution and includes 15 minutes of data. The first dimension of the image represents the scan angle in instrument coordinates. In this system the azimuthal attitude vector points to +90 degree scan angle. The second is the imaged angle, where 90 degrees is the central viewing angle of the instrument and the direction of the polar attitude vector. spase://SMWG/Person/David.J.McComas PrincipalInvestigator spase://SMWG/Person/Jan.Merka MetadataContact TWINS Home Page http://twins.swri.edu ? spase://VMO/NumericalData/TWINS1/Imager/L1.PT15M spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb Online Open FTP access to files at SPDF ftp://spdf.gsfc.nasa.gov/pub/data/twins/twins1/imager/ NASA/GSFC CDAWeb ftp access to the data. HTTP access to files at SPDF http://spdf.gsfc.nasa.gov/pub/data/twins/twins1/imager/ NASA/GSFC CDAWeb http access to the data. CDF None spase://SMWG/Repository/NASA/GSFC/SPDF Online Open CDAWeb http://cdaweb.gsfc.nasa.gov/sp_phys/ TWINS1_L1_IMAGER Level-1 Magnetospheric Images at full resolution with subset, plot, list functionalities from CDAWeb Text Please acknowledge the CDAWeb team at GSFC/SPDF. spase://SMWG/Instrument/TWINS1/ENA NeutralAtomImages 2007-04-18T00:01:38Z -P14D PT15M Earth.Magnetosphere Epoch Epoch Epoch 31-Dec-9999 23:59:59.999 Temporal satellite satellite Satellite ID number (1=twins1 or 2=twins2) 1.0 2.0 -1.0 Other smooth_image smooth_image TWINS smooth image of neutral atom flux for all energies (cm^2 sr s)^-1 9 90 22 Atom Differential NumberFlux 1 50 keV TWINS smooth image @ 1 keV (cm^2 sr s eV)^-1 smooth_image_e1 Statistically smoothed TWINS image of flux per energy at 1 keV energy, in units of (cm^2 sr s eV)^-1. (cm^2 sr s eV)^-1 90 22 Atom Differential NumberFlux 1 1 keV TWINS smooth image @ 4 keV (cm^2 sr s eV)^-1 smooth_image_e2 Statistically smoothed TWINS image of flux per energy at 4 keV energy, in units of (cm^2 sr s eV)^-1. (cm^2 sr s eV)^-1 90 22 Atom Differential NumberFlux 4 4 keV TWINS smooth image @ 8 keV (cm^2 sr s eV)^-1 smooth_image_e3 Statistically smoothed TWINS image of flux per energy at 8 keV energy, in units of (cm^2 sr s eV)^-1. (cm^2 sr s eV)^-1 90 22 Atom Differential NumberFlux 8 8 keV TWINS smooth image @ 12 keV (cm^2 sr s eV)^-1 smooth_image_e4 Statistically smoothed TWINS image of flux per energy at 12 keV energy, in units of (cm^2 sr s eV)^-1. (cm^2 sr s eV)^-1 90 22 Atom Differential NumberFlux 12 12 keV TWINS smooth image @ 16 keV (cm^2 sr s eV)^-1 smooth_image_e5 Statistically smoothed TWINS image of flux per energy at 16 keV energy, in units of (cm^2 sr s eV)^-1. (cm^2 sr s eV)^-1 90 22 Atom Differential NumberFlux 16 16 keV TWINS smooth image @ 20 keV (cm^2 sr s eV)^-1 smooth_image_e6 Statistically smoothed TWINS image of flux per energy at 20 keV energy, in units of (cm^2 sr s eV)^-1. (cm^2 sr s eV)^-1 90 22 Atom Differential NumberFlux 20 20 keV TWINS smooth image @ 25 keV (cm^2 sr s eV)^-1 smooth_image_e7 Statistically smoothed TWINS image of flux per energy at 25 keV energy, in units of (cm^2 sr s eV)^-1. (cm^2 sr s eV)^-1 90 22 Atom Differential NumberFlux 25 25 keV TWINS smooth image @ 30 keV (cm^2 sr s eV)^-1 smooth_image_e8 Statistically smoothed TWINS image of flux per energy at 30 keV energy, in units of (cm^2 sr s eV)^-1. (cm^2 sr s eV)^-1 90 22 Atom Differential NumberFlux 30 30 keV TWINS smooth image @ 50 keV (cm^2 sr s eV)^-1 smooth_image_e9 Statistically smoothed TWINS image of flux per energy at 50 keV energy, in units of (cm^2 sr s eV)^-1. (cm^2 sr s eV)^-1 90 22 Atom Differential NumberFlux 50 50 keV pixel_sweep_count pixel_sweep_count The per-pixel sweep count is the number of times a given pixel was sampled by the instrument during the time taken to make the image. This value is only a function of longitude (actuation angle), and so is the same for all latitude (imaged) pixels at a given scan (actuation) angle. The value is nominally the same for all pixels in an image, and is the same as the number of sweeps in the image. Differences from this value are due to errors in either actuator motion or transmission of data from agiven direction. 90 22 Other target value smooth_image_val Target value for the number of counts per pixel used in the smoothing algorithm. This value can vary by energy. 9 0.0 100.0 -1.0E31 Other energy smooth_image_energy_kev Array of energy values (in keV) for the smoothed images. Nominally 1, 4, 8, 12, 16, 20, 25, 30, and 50 keV. keV 9 0.0 1000.0 -1.0E31 Other smoothing algorithm version smooth_image_version [LIST ONLY] version of the smoothing algorithm used to create the TWINS_SMOOTH_IMAGE. Other units smooth_image_units [LIST ONLY] units of smoothed twins image 9 Other lon min lonmin_deg Longitude (deg) at the middle of the first pixel. For 4 deg pixel_size this is nominally -88 degrees. deg -90.0 270.0 -1.0E31 Other lon max lonmax_deg Longitude (deg) at the middle of the last pixel. For 4 deg pixel_size this is nominally -92 degrees. deg -90.0 270.0 -1.0E31 Other lat min latmin_deg Latitude (deg) at the middle of the first pixel. For 4 deg pixel_size this is nominally 4 degrees. deg 2.0 90.0 -1.0E31 Other lat max latmax_deg Latitude (deg) at the middle of the last pixel. For 4 deg pixel_size this is nominally 88 degrees. deg 2.0 90.0 -1.0E31 Other lat pixel bin size lat_pixelsize_deg The pixel size in the imaging (polar) direction. deg 0 10 -1 Other lon pixel bin size lon_pixelsize_deg The pixel size in the scan (longitudinal) direction. deg 0 10 -1 Other start/stop time of image time_YYMMDD Start time of the image and the stop time of the image 2 Start time 1 Stop time 2 Temporal start/stop time of image (MJD) time_MJD Start time of the image and the stop time of the image in Modified Julian Date (MJD) days 2 Start time 1 Stop time 2 -1.0E31 Temporal smooth_error_image smooth_error_image TWINS smoothed image error image for all energies. The error in the flux for each pixel is given by sqrt(counts) / counts using the counts included in each pixel of the image. (cm^2 sr s)^-1 9 90 22 Atom Uncertainty Differential NumberFlux 1 50 keV TWINS smooth Error_Image @ 1 keV (cm^2 sr s eV)^-1 smooth_error_image_e1 TWINS smoothed image error image at 1 keV energy. The error in the flux for each pixel is given by sqrt(counts) / counts using the counts included in each pixel of the image. (cm^2 sr s eV)^-1 90 22 Atom Uncertainty Differential NumberFlux 1 1 keV TWINS Smooth Error_Image @ 4 keV (cm^2 sr s eV)^-1 smooth_error_image_e2 TWINS smoothed image error image at 4 keV energy. The error in the flux for each pixel is given by sqrt(counts) / counts using the counts included in each pixel of the image. (cm^2 sr s eV)^-1 90 22 Atom Uncertainty Differential NumberFlux 4 4 keV TWINS Smooth Error_Image @ 8 keV (cm^2 sr s eV)^-1 smooth_error_image_e3 TWINS smoothed image error image at 8 keV energy. The error in the flux for each pixel is given by sqrt(counts) / counts using the counts included in each pixel of the image. (cm^2 sr s eV)^-1 90 22 Atom Uncertainty Differential NumberFlux 8 8 keV TWINS Smooth Error_Image @ 12 keV (cm^2 sr s eV)^-1 smooth_error_image_e4 TWINS smoothed image error image at 12 keV energy. The error in the flux for each pixel is given by sqrt(counts) / counts using the counts included in each pixel of the image. (cm^2 sr s eV)^-1 90 22 Atom Uncertainty Differential NumberFlux 12 12 keV TWINS Smooth Error_Image @ 16 keV (cm^2 sr s eV)^-1 smooth_error_image_e5 TWINS smoothed image error image at 16 keV energy. The error in the flux for each pixel is given by sqrt(counts) / counts using the counts included in each pixel of the image. (cm^2 sr s eV)^-1 90 22 Atom Uncertainty Differential NumberFlux 16 16 keV TWINS Smooth Error_Image @ 20 keV (cm^2 sr s eV)^-1 smooth_error_image_e6 TWINS smoothed image error image at 20 keV energy. The error in the flux for each pixel is given by sqrt(counts) / counts using the counts included in each pixel of the image. (cm^2 sr s eV)^-1 90 22 Atom Uncertainty Differential NumberFlux 20 20 keV TWINS Smooth Error_Image @ 25 keV (cm^2 sr s eV)^-1 smooth_error_image_e7 TWINS smoothed image error image at 25 keV energy. The error in the flux for each pixel is given by sqrt(counts) / counts using the counts included in each pixel of the image. (cm^2 sr s eV)^-1 90 22 Atom Uncertainty Differential NumberFlux 25 25 keV TWINS Smooth Error_Image @ 30 keV (cm^2 sr s eV)^-1 smooth_error_image_e8 TWINS smoothed image error image at 30 keV energy. The error in the flux for each pixel is given by sqrt(counts) / counts using the counts included in each pixel of the image. (cm^2 sr s eV)^-1 90 22 Atom Uncertainty Differential NumberFlux 30 30 keV TWINS Smooth Error_Image @ 50 keV (cm^2 sr s eV)^-1 smooth_error_image_e9 TWINS smoothed image error image at 50 keV energy. The error in the flux for each pixel is given by sqrt(counts) / counts using the counts included in each pixel of the image. (cm^2 sr s eV)^-1 90 22 Atom Uncertainty Differential NumberFlux 50 50 keV Attitude/Ephemeris flag no_orbit_data A flag that identifies when attitude and ephemeris information are available. A value of 0 indicates data are available; a value of 1 indicates that either attitude or ephemeris information is not available for a given time interval. 0 1 -1 Other attitude_delta_deg attitude_delta_deg The change (in degrees) of the spacecraft attitude vector over the time required to make the given image. deg 0.0 90.0 -1.0E31 Other spacecraft position sc_posv_re_eci The average spacecraft location vector over the time interval of the image in ECI coordinates (cartesian XYZ components). Earth Radii 6.380e6>m 3 X ECI Component.I 1 Y ECI Component.J 2 Z ECI Component.K 3 -10.0 10.0 -1.0E31 Vector Positional polar attitude spin_axis_eci The average polar pointing unit vector over the time interval of the image in ECI coordinates (Cartesian XYZ components). The polar attitude vector points to 90 degree instrument polar (imaged) angle. radians Cartesian GEI 3 -10.0 10.0 -1.0E31 Other azimuth attitude prime_meridian_eci The average azimuthal pointing unit vector over the time interval of the image in ECI coordinates (Cartesian XYZ components). The azimuthal pointing vector points to +90 degree instrument scan angle. Cartesian GEI 3 -10.0 10.0 -1.0E31 Other sun position sun_posv_eci The average Sun unit vector over the time interval of the image in ECI coordinates (Cartesian XYZ components). Cartesian GEI 3 -10.0 10.0 -1.0E31 Other magnetic dipole mag_eci The average geomagnetic dipole unit vector over the time interval of the image in ECI coordinates (Cartesian XYZ components). Cartesian GEI 3 -10.0 10.0 -1.0E31 Other spacecraft position sc_posv_re_sm The average spacecraft location vector over the time interval of the image in SM coordinates (Cartesian XYZ components). Earth Radii 6.380e6>m Cartesian SM 3 X SM Component.I 1 Y SM Component.J 2 Z SM Component.K 3 -10.0 10.0 -1.0E31 Vector Positional polar attitude spin_axis_sm The average polar pointing unit vector over the time interval of the image in SM coordinates (Cartesian XYZ components). The polar attitude vector points to 90 degree instrument polar (imaged) angle. Cartesian GEI 3 -10.0 10.0 -1.0E31 Other azimuth attitude prime_meridian_sm The average azimuthal pointing unit vector over the time interval of the image in SM coordinates (Cartesian XYZ components). The azimuthal pointing vector points to +90 degree instrument scan angle. Cartesian GEI 3 -10.0 10.0 -1.0E31 Other sun position sun_posv_sm The average Sun position unit vector over the time interval of the image in SM coordinates (Cartesian XYZ components). Cartesian GEI 3 -10.0 10.0 -1.0E31 Other magnetic dipole mag_sm The average geomagnetic dipole unit vector over the time interval of the image in SM coordinates (Cartesian XYZ components). Cartesian GEI 3 -10.0 10.0 -1.0E31 Other sat location radial_distance_re Spacecraft radial distance (in Earth radii) from the center of the Earth. Earth Radii 6.380e6>m Spherical SM -1000.0 1000.0 -1.0E31 Magnitude Positional lat latitude_deg Spacecraft latitude in SM coordinates deg Spherical SM -90.0 90.0 -1.0E31 DirectionAngle.ElevationAngle Positional lshell lshell_dip The McIlwain L-Shell at the spacecraft location assuming a dipole magnetic field model and using SM coordinates. deg -1000.0 1000.0 -1.0E31 Positional mlt mlt Spacecraft magnetic local time in SM coordinates. hours Spherical SM 0.0 24.0 -1.0E31 DirectionAngle.AzimuthAngle Positional energy energy_kev Array of energy values (in keV) for the images. Nominally 1, 4, 8, 12, 16, 20, 25, 30, and 50 keV. keV 9 0.0 1000.0 -1.0E31 Other image type all_energies 0 for a Differential Energy Flux image. 1 for an All Energies image 0 1 -1 Other saveset_version saveset_version saveset_version 0 99 -1 Other times/sweeps title [LIST ONLY] Start and stop times of the image, along with the selected number of sweeps. Other units units_of_twins_image [LIST ONLY] units of raw twins image 9 Other software version sw_version [LIST ONLY] Software version Other image creation time creation_time [LIST ONLY] Time image was created Other twins_raw_image twins_image TWINS raw image of flux for all energies (cm^2 sr s)^-1 9 90 22 Atom Differential NumberFlux 1 50 keV TWINS Raw Image @ 1 keV (cm^2 sr s eV)^-1 twins_image_e1 TWINS raw image at 1 keV energy, in units of (cm^2 sr s eV)^-1. (cm^2 sr s eV)^-1 90 22 Atom Differential NumberFlux 1 1 keV TWINS Raw Image @ 4 keV (cm^2 sr s eV)^-1 twins_image_e2 TWINS raw image at 4 keV energy, in the same format as the 1 keV image. (cm^2 sr s eV)^-1 90 22 Atom Differential NumberFlux 4 4 keV TWINS Raw Image @ 8 keV (cm^2 sr s eV)^-1 twins_image_e3 TWINS raw image at 8 keV energy, in the same format as the 1 keV image. (cm^2 sr s eV)^-1 90 22 Atom Differential NumberFlux 8 8 keV TWINS Raw Image @ 12 keV (cm^2 sr s eV)^-1 twins_image_e4 TWINS raw image at 12 keV energy, in the same format as the 1 keV image. (cm^2 sr s eV)^-1 90 22 Atom Differential NumberFlux 12 12 keV TWINS Raw Image @ 16 keV (cm^2 sr s eV)^-1 twins_image_e5 TWINS raw image at 16 keV energy, in the same format as the 1 keV image. (cm^2 sr s eV)^-1 90 22 Atom Differential NumberFlux 16 16 keV TWINS Raw Image @ 20 keV (cm^2 sr s eV)^-1 twins_image_e6 TWINS raw image at 20 keV energy, in the same format as the 1 keV image. (cm^2 sr s eV)^-1 90 22 Atom Differential NumberFlux 20 20 keV TWINS Raw Image @ 25 keV (cm^2 sr s eV)^-1 twins_image_e7 TWINS raw image at 25 keV energy, in the same format as the 1 keV image. (cm^2 sr s eV)^-1 90 22 Atom Differential NumberFlux 25 25 keV TWINS Raw Image @ 30 keV (cm^2 sr s eV)^-1 twins_image_e8 TWINS raw image at 30 keV energy, in the same format as the 1 keV image. (cm^2 sr s eV)^-1 90 22 Atom Differential NumberFlux 30 30 keV TWINS Raw Image @ 50 keV (cm^2 sr s eV)^-1 twins_image_e9 TWINS raw image at 50 keV energy, in the same format as the 1 keV image. (cm^2 sr s eV)^-1 90 22 Atom Differential NumberFlux 50 50 keV raw_error_image error_image TWINS error image for raw image at all energies. The error in the flux for each pixel is based on the error in the fit of flux vs energy used to determine the flux value given in the primary image. Fractional Error 9 90 22 Atom Uncertainty Differential NumberFlux 1 50 keV Raw Error Image @ 1 keV error_image_e1 TWINS error image for raw image at 1 keV energy. The error in the flux for each pixel is based on the error in the fit of flux vs energy used to determine the flux value given in the primary image. Fractional Error 90 22 Atom Uncertainty Differential NumberFlux 1 1 keV Raw Error Image @ 4 keV error_image_e2 TWINS error image for raw image at 4 keV energy. The error in the flux for each pixel is based on the error in the fit of flux vs energy used to determine the flux value given in the primary image. Fractional Error 90 22 Atom Uncertainty Differential NumberFlux 4 4 keV Raw Error Image @ 8 keV error_image_e3 TWINS error image for raw image at 8 keV energy. The error in the flux for each pixel is based on the error in the fit of flux vs energy used to determine the flux value given in the primary image. Fractional Error 90 22 Atom Uncertainty Differential NumberFlux 8 8 keV Raw Error Image @ 12 keV error_image_e4 TWINS error image for raw image at 12 keV energy. The error in the flux for each pixel is based on the error in the fit of flux vs energy used to determine the flux value given in the primary image. Fractional Error 90 22 Atom Uncertainty Differential NumberFlux 12 12 keV Raw Error Image @ 16 keV error_image_e5 TWINS error image for raw image at 16 keV energy. The error in the flux for each pixel is based on the error in the fit of flux vs energy used to determine the flux value given in the primary image. Fractional Error 90 22 Atom Uncertainty Differential NumberFlux 16 16 keV Raw Error Image @ 20 keV error_image_e6 TWINS error image for raw image at 20 keV energy. The error in the flux for each pixel is based on the error in the fit of flux vs energy used to determine the flux value given in the primary image. Fractional Error 90 22 Atom Uncertainty Differential NumberFlux 20 20 keV Raw Error Image @ 25 keV error_image_e7 TWINS error image for raw image at 25 keV energy. The error in the flux for each pixel is based on the error in the fit of flux vs energy used to determine the flux value given in the primary image. Fractional Error 90 22 Atom Uncertainty Differential NumberFlux 25 25 keV Raw Error Image @ 30 keV error_image_e8 TWINS error image for raw image at 30 keV energy. The error in the flux for each pixel is based on the error in the fit of flux vs energy used to determine the flux value given in the primary image. Fractional Error 90 22 Atom Uncertainty Differential NumberFlux 30 30 keV Raw Error Image @ 50 keV error_image_e9 TWINS error image for raw image at 50 keV energy. The error in the flux for each pixel is based on the error in the fit of flux vs energy used to determine the flux value given in the primary image. Fractional Error 90 22 Atom Uncertainty Differential NumberFlux 50 50 keV