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Gakona THEMIS Ground-based All Sky Imager; Full Resolution Images.

(2023). Gakona THEMIS Ground-based All Sky Imager; Full Resolution Images. [Data set]. University of California, Berkeley. https://doi.org/10.48322/vpb7-yq61. Accessed on .

Note: Proper references, including those in BibTex or other formats, should include the "Accessed on date" as shown above to identify the version of the resource being cited in a given publication.

ResourceID
spase://NASA/NumericalData/THEMIS/Ground/Gakona/ASI/full_PT3S

Description

THEMIS Ground All Sky Imager at Gakona (62.39 deg GLat, 214.87 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.

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Details

Version:2.5.0

NumericalData

ResourceID
spase://NASA/NumericalData/THEMIS/Ground/Gakona/ASI/full_PT3S
ResourceHeader
ResourceName
Gakona THEMIS Ground-based All Sky Imager; Full Resolution Images.
AlternateName
THEMIS-Ground ASF
DOI
https://doi.org/10.48322/vpb7-yq61
ReleaseDate
2023-08-07 13:00:00Z
RevisionHistory
RevisionEvent
ReleaseDate
2023-06-28 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.
Description

THEMIS Ground All Sky Imager at Gakona (62.39 deg GLat, 214.87 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.

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 00:00:00
PublishedBy
University of California, Berkeley
Contacts
RolePersonStartDateStopDateNote
1.PrincipalInvestigatorspase://SMWG/Person/Vassilis.Angelopoulos
2.CoInvestigatorspase://SMWG/Person/Stephen.B.Mende
3.CoInvestigatorspase://SMWG/Person/Eric.Donovan
4.CoInvestigatorspase://SMWG/Person/Harald.U.Frey
5.CoInvestigatorspase://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.

PriorIDs
spase://VMO/NumericalData/THEMIS/Ground/CANMAG/GAKO/ASI/full_PT3S
spase://VSPO/NumericalData/THEMIS/Ground/Gakona/ASI/full_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/gako/
Format
CDF
Encoding
None
InstrumentIDs
spase://SMWG/Instrument/THEMIS/Ground/UCLA-GBO/GAKO/ASI
MeasurementType
ImageIntensity
TemporalDescription
TimeSpan
StartDate
2006-09-12 05:00:00
RelativeStopDate
-P1Y
Cadence
PT3S
Caveats
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.
Parameter #1
Name
thg_asf_gako
ParameterKey
thg_asf_gako
Description

Full images of 256x256 pixels; saturation counts for each pixel.

Units
counts
Structure
Size
256 256
Wave
Qualifier
Scalar
WaveQuantity
Intensity
Parameter #2
Name
thg_asf_gako_column
ParameterKey
thg_asf_gako_column
Description

Image column number; x-dimension, image width.

Structure
Size
256
Support
SupportQuantity
Other
Parameter #3
Name
thg_asf_gako_row
ParameterKey
thg_asf_gako_row
Description

Image row number; y-dimension, image height.

Structure
Size
256
Support
SupportQuantity
Other
Parameter #4
Name
thg_asf_gako_time
ParameterKey
thg_asf_gako_time
Description

Start of integration 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
Parameter #5
Name
thg_asf_gako_tend
ParameterKey
thg_asf_gako_tend
Description

Integration end 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