2.7.1 https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions spase://NASA/NumericalData/THEMIS/Ground/Gillam/ASI/full_PT3S NASA NumericalData Gillam THEMIS Ground-based All Sky Imager; Full Resolution Images. THEMIS-Ground ASF https://doi.org/10.48322/vwqd-3e17 2025-12-04T13:31:52Z 2023-06-26T13:00:00Z Made changes requested by F. Frey, Updated version. Added contact and DOI info. 2023-08-07T13:00:00Z Added Emma Spanswick to contacts. 2025-08-05T13:12:40Z Added ObservedRegion(s). Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. Matched version number in schemaLocation attribute to value in Version tag. ZCB 2025-09-30T14:25:22Z Updated PublishedBy name to match ROR Registry. Added ResourceType and NamingAuthority. ZCB 2025-12-04T13:31:52Z Added MetadataRightsList. Updated to 2.7.1. ZCB THEMIS Ground All Sky Imager at Gillam (56.35 deg GLat, 265.34 deg GLong): 256 x 256 pixel full resolution images of auroral oval. The ASI stations monitor a 170 degree field of view imaging the auroral oval at kilometer resolution. The ASI is comprised of a fisheye lens and CCD in a stainless steel enclosure topped with a transparent acrylic dome. The CCD has a resolution of 256 x 256 pixels. Exposure control ranges from 5 s to 1 ms although the typical data rate is one image every 3 seconds. Silicone heaters keep the instrument within the nominal temperature range. During daylight hours a sun shades deploy to protect the CCD. We acknowledge NASA contract NAS5-02099 and V. Angelopoulos for use of data from the THEMIS Mission. Specifically: S. Mende and E. Donovan for use of the ASI data, and the CSA for logistical support in fielding and data retrieval from the GBO stations. Angelopoulos, V., Mende, S. B., Donovan, E., and Frey, H. U. 2023-01-01T00:00:00 Space Sciences Laboratory spase://SMWG/Person/Vassilis.Angelopoulos PrincipalInvestigator spase://SMWG/Person/Stephen.B.Mende CoInvestigator spase://SMWG/Person/Eric.Donovan CoInvestigator spase://SMWG/Person/Harald.U.Frey CoInvestigator spase://SMWG/Person/Emma.Louise.Spanswick CoInvestigator THEMIS Summary Plots http://themis.ssl.berkeley.edu/gbo/display.py?view_type=summary Summary plots containing ASI thumbnail images; useful for determining when ASI data exists. spase://VMO/NumericalData/THEMIS/Ground/CANMAG/GILL/ASI/full_PT3S spase://VSPO/NumericalData/THEMIS/Ground/Gillam/ASI/full_PT3S spase://SMWG/Repository/UCB/THEMIS Online Open THEMIS Web Data http://themis.ssl.berkeley.edu/data/themis/thg/l1/asi/gill/ CDF None spase://SMWG/Instrument/THEMIS/Ground/CANMAG/GILL/ASI ImageIntensity 2006-06-01T04:00:00 -P1Y PT3S Earth.NearSurface.Ionosphere Earth.Surface ASF data is retrieved by physically swapping hard drives at GBO site therefore the data is usually not available for at least 3-5 months. thg_asf_gill thg_asf_gill Full images of 256x256 pixels; saturation counts for each pixel. counts 256 256 Scalar Intensity thg_asf_gill_column thg_asf_gill_column Image column number; x-dimension, image width. 256 Other thg_asf_gill_row thg_asf_gill_row Image row number; y-dimension, image height. 256 Other thg_asf_gill_time thg_asf_gill_time Start of integration time, UTC, in seconds since 01-Jan-1970 00:00:00 Not including leap seconds s 0.0 5.0E9 NaN Temporal thg_asf_gill_tend thg_asf_gill_tend Integration end time, UTC, in seconds since 01-Jan-1970 00:00:00 Not including leap seconds s 0.0 5.0E9 NaN Temporal