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Data Access
THEMIS Web Data
THEMIS GBO All Sky Imager at Fort Simpson, NT, Canada. ASI Thumbnails Data.
var authors='Angelopoulos, V., Mende, S. B., Donovan, E., and Frey, H. U.';
document.write(authors);
(2023).
THEMIS GBO All Sky Imager at Fort Simpson, NT, Canada. ASI Thumbnails Data..
[Data set].
Space Sciences Laboratory.
https://doi.org/10.48322/j9mz-n391. Accessed on document.write(currentDateStr);.
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ResourceID
spase://NASA/NumericalData/THEMIS/Ground/Fort.Simpson/ASI/thumb_PT3S
Description
THEMIS Ground All Sky Imager at Fort Simpson (61.76 deg GLat, 238.77 deg GLong): 32 x 32 pixel thumbnails for full ASI images. 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 sun shades deploy to protect the CCD.
Metadata Rights
CC0-1.0:
Creative Commons Zero v1.0 Universal
Note
CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions. The actual data/software may be subject to a different license.
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Details
Version:2.7.1
NumericalData
ResourceID
spase://NASA/NumericalData/THEMIS/Ground/Fort.Simpson/ASI/thumb_PT3S
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
THEMIS GBO All Sky Imager at Fort Simpson, NT, Canada. ASI Thumbnails Data.
AlternateName
THEMIS-Ground AST
DOI
https://doi.org/10.48322/j9mz-n391
ReleaseDate
2026-07-21 12:07:46Z
RevisionHistory
RevisionEvent
ReleaseDate
2023-06-30 13:00:00Z
Note
Made changes requested by F. Frey, Updated version. Added contact and DOI info.
RevisionEvent
ReleaseDate
2023-08-07 13:00:00Z
Note
Added Emma Spanswick to contacts.
RevisionEvent
ReleaseDate
2025-08-05 13:12:39Z
Note
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
RevisionEvent
ReleaseDate
2025-09-30 14:25:21Z
Note
Updated PublishedBy name to match ROR Registry. Added ResourceType and NamingAuthority. ZCB
RevisionEvent
ReleaseDate
2025-12-04 13:31:51Z
Note
Added MetadataRightsList. Updated to 2.7.1. ZCB
RevisionEvent
ReleaseDate
2026-06-26 13:29:12Z
Note
Add 'Z' to PublicationDate, TemporalDescription:TimeSpan:StartDate. ZCB
RevisionEvent
ReleaseDate
2026-07-21 12:07:46Z
Note
Added HelioData InformationURL. JWL
Description
THEMIS Ground All Sky Imager at Fort Simpson (61.76 deg GLat, 238.77 deg GLong): 32 x 32 pixel thumbnails for full ASI images. 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 sun shades deploy to protect the CCD.
Acknowledgement
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.
PublicationInfo
Authors
Angelopoulos, V., Mende, S. B., Donovan, E., and Frey, H. U.
PublicationDate
2023-01-01 00:00:00Z
PublishedBy
Space Sciences Laboratory
Contacts
Role
Person
StartDate
StopDate
Note
1.
PrincipalInvestigator
spase://SMWG/Person/Vassilis.Angelopoulos
2.
CoInvestigator
spase://SMWG/Person/Stephen.B.Mende
3.
CoInvestigator
spase://SMWG/Person/Eric.Donovan
4.
CoInvestigator
spase://SMWG/Person/Harald.U.Frey
5.
CoInvestigator
spase://SMWG/Person/Emma.Louise.Spanswick
InformationURL
Name
THEMIS Summary Plots
URL
http://themis.ssl.berkeley.edu/gbo/display.py?view_type=summary
Description
Summary plots containing ASI thumbnail images; useful for determining when ASI data exists.
InformationURL
Name
HelioData
URL
https://helio.data.nasa.gov/dataset/THEMIS_Ground_Fort.Simpson_ASI_thumb_PT3S
Description
The HelioData dataset page provides an overview of the dataset with access links, associated variables, and more.
PriorIDs
spase://VMO/NumericalData/THEMIS/Ground/CANMAG/FSIM/ASI/thumb_PT3S
spase://VSPO/NumericalData/THEMIS/Ground/Fort.Simpson/ASI/thumb_PT3S
AccessInformation
RepositoryID
spase://SMWG/Repository/UCB/THEMIS
Availability
Online
AccessRights
Open
AccessURL
Name
THEMIS Web Data
URL
http://themis.ssl.berkeley.edu/data/themis/thg/l1/asi/fsim/
Format
CDF
Encoding
None
InstrumentIDs
spase://SMWG/Instrument/THEMIS/Ground/CANMAG/FSIM/ASI
MeasurementType
ImageIntensity
TemporalDescription
TimeSpan
StartDate
2006-11-11 04:00:00Z
RelativeStopDate
-P7D
Cadence
PT3S
ObservedRegion
Earth.NearSurface.Ionosphere
ObservedRegion
Earth.Surface
Parameter #1
Name
thg_ast_fsim
ParameterKey
thg_ast_fsim
Description
Thumbnail images of 32x32 pixels; saturation counts for each pixel.
Units
counts
Structure
Size
32 32
Wave
Qualifier
Scalar
WaveQuantity
Intensity
Parameter #2
Name
thg_ast_fsim_column
ParameterKey
thg_ast_fsim_column
Description
Image column number; x-dimension, image width.
Structure
Size
32
Support
SupportQuantity
Other
Parameter #3
Name
thg_ast_fsim_row
ParameterKey
thg_ast_fsim_row
Description
Image row number; y-dimension, image height.
Structure
Size
32
Support
SupportQuantity
Other
Parameter #4
Name
thg_ast_fsim_time
ParameterKey
thg_ast_fsim_time
Description
thg_ast_fsim_time, UTC, in seconds since 01-Jan-1970 00:00:00
Caveats
Not including leap seconds
Units
s
ValidMin
0.0
ValidMax
5.0E9
FillValue
NaN
Support
SupportQuantity
Temporal