Table · dataset · 2025

THEMIS Ground-based All Sky Imager Keogram, Level-1

Listed in NASA Data Portal

THEMIS Ground All Sky Imager Keograms for all observatories.

Description

Keograms are composed of thin images slices taken down the middle of all-sky images and graphed against time. Keograms allow for substorm analysis without the need for full sized raw images.

The ASI stations each 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. Exposure control ranges from 5 s to 1 ms although the typical data rate is one image every 3 seconds.

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Silicone heaters keep the instrument within the nominal temperature range. During daylight hours a sun shades deploy to protect the CCD.

Topics

From keywords: Astronomy & Astrophysics · Earth & Environmental Science · Ocean & Atmospheric Science · Physics
Inferred from text: Image 75% · Imaging 75%

Provenance · 1 source records, 12 field assertions

Source	Key	Last seen	Raw
NASA Data Portal	c17f800e-9749-4415-928f-9c3042280a32	12 d ago	JSON v1

Field	Assertion	Extractor	Evidence
concepts[field].local:field:astronomy	mapping · data nasa gov	connector:data_nasa_gov@1.0.0
concepts[field].local:field:earth-environmental	mapping · data nasa gov	connector:data_nasa_gov@1.0.0
concepts[field].local:field:ocean-atmospheric	mapping · data nasa gov	connector:data_nasa_gov@1.0.0
concepts[field].local:field:physics	mapping · data nasa gov	connector:data_nasa_gov@1.0.0
concepts[modality].local:modality:image	enrichment · data nasa gov	keyword-concept-rules@1.0.0	title+description (75%)
concepts[modality].local:modality:imaging	enrichment · data nasa gov	keyword-concept-rules@1.0.0	title+description (75%)
created_date	source · data nasa gov	connector:data_nasa_gov@1.0.0
description	source · data nasa gov	connector:data_nasa_gov@1.0.0	/notes
license_text	source · data nasa gov	connector:data_nasa_gov@1.0.0
publication_date	source · data nasa gov	connector:data_nasa_gov@1.0.0
title	source · data nasa gov	connector:data_nasa_gov@1.0.0	/title
updated_date	source · data nasa gov	connector:data_nasa_gov@1.0.0

THEMIS Ground-based All Sky Imager Keogram, Level-1

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