Ionosphere images from Alouette satellites Designed and assembled in Canada, Alouette-1 was the first satellite built by a nation other than the United States or the Soviet Union. It was constructed at a time when most satellites had a useful lifespan of a few months. Although Alouette-1 was as complex as any previously launched satellite, rapidly advancing technology and the extreme care exercised in all phases of the Alouette-1 development had led the Canadian builders to expect that their satellite would operate for at least 1 year. However, Alouette-1 operated for 10 years in its first 3 months of operation, Alouette-1 produced some of the most exciting data obtained during the entire 50-year history of ionospheric research, and it continued to provide valuable information until its tenth birthday. Alouette-1 is best known for its swept-frequency topside sounder experiment. The other experiments (VLF, cosmic noise, and energetic particle measurements) were, however, equally successful and they also remained operational for 10 years. The Alouette-1 mission resulted in over 300 publications in refereed scientific journals. About 80 percent of the Alouette-1 publications were based on the ionograms obtained from the topside sounder experiment. In its first 3 years of operation, Alouette-1 obtained over a million ionograms, each equivalent to a snapshot of the ionosphere from the Alouette-1 altitude of 1000 km down to an altitude of about 300 km. These ionograms have provided data at all geomagnetic latitudes and at geographic latitudes ranging from 80° N to 80° S. After 10 years, Alouette-1 had produced two million ionograms. The great majority of these ionograms are still archived on 35 mm negative film rolls, a format which is not very convenient for research. As a special project, the Canadian Space Agency has recently started to digitize some of these films. Although this data dates back from the ‘60s, there is still a significant scientific interest in analyzing this data to better understand the ionosphere. The first sets of data already available will be enhanced in the near future. 2017-04-25 2017-10-27 Canadian Space Agency asc.gouvernementouvert-opengovernment.csa@canada.ca Science and TechnologyAlouetteSatelliteIonogramsIonosphere Ionosphere images from Alouette satellites - DatasetPNG ftp://ftp.asc-csa.gc.ca/users/OpenData_DonneesOuvertes/pub/AlouetteData/ Data specifications Alouette-IDOCX ftp://ftp.asc-csa.gc.ca/users/OpenData_DonneesOuvertes/pub/AlouetteData/Data%20specifications%20Alouette-I%20.docx Data specifications Alouette-IDOCX ftp://ftp.asc-csa.gc.ca/users/OpenData_DonneesOuvertes/pub/AlouetteData/Data specifications Alouette-I_FR.docx Alouette 1 data restorationDOCX ftp://ftp.asc-csa.gc.ca/users/OpenData_DonneesOuvertes/pub/AlouetteData/Alouette 1 data restoration_EN.docx Alouette 1 data restorationDOCX ftp://ftp.asc-csa.gc.ca/users/OpenData_DonneesOuvertes/pub/AlouetteData/Restauration des donnees Alouette1_FR.docx Reference SheetXLSX ftp://ftp.asc-csa.gc.ca/users/OpenData_DonneesOuvertes/pub/AlouetteData/Reference Sheet.xlsx Reference SheetCSV ftp://ftp.asc-csa.gc.ca/users/OpenData_DonneesOuvertes/pub/AlouetteData/Reference Sheet_fixed_Alouette.csv MicrofichesJPG ftp://ftp.asc-csa.gc.ca/users/OpenData_DonneesOuvertes/pub/AlouetteData/Microfiches/

Ionosphere images from Alouette satellites

Designed and assembled in Canada, Alouette-1 was the first satellite built by a nation other than the United States or the Soviet Union. It was constructed at a time when most satellites had a useful lifespan of a few months. Although Alouette-1 was as complex as any previously launched satellite, rapidly advancing technology and the extreme care exercised in all phases of the Alouette-1 development had led the Canadian builders to expect that their satellite would operate for at least 1 year. However, Alouette-1 operated for 10 years in its first 3 months of operation, Alouette-1 produced some of the most exciting data obtained during the entire 50-year history of ionospheric research, and it continued to provide valuable information until its tenth birthday. Alouette-1 is best known for its swept-frequency topside sounder experiment. The other experiments (VLF, cosmic noise, and energetic particle measurements) were, however, equally successful and they also remained operational for 10 years. The Alouette-1 mission resulted in over 300 publications in refereed scientific journals. About 80 percent of the Alouette-1 publications were based on the ionograms obtained from the topside sounder experiment. In its first 3 years of operation, Alouette-1 obtained over a million ionograms, each equivalent to a snapshot of the ionosphere from the Alouette-1 altitude of 1000 km down to an altitude of about 300 km. These ionograms have provided data at all geomagnetic latitudes and at geographic latitudes ranging from 80° N to 80° S. After 10 years, Alouette-1 had produced two million ionograms.

The great majority of these ionograms are still archived on 35 mm negative film rolls, a format which is not very convenient for research. As a special project, the Canadian Space Agency has recently started to digitize some of these films. Although this data dates back from the ‘60s, there is still a significant scientific interest in analyzing this data to better understand the ionosphere. The first sets of data already available will be enhanced in the near future.

Resources

Resource Name Resource Type Format Language Links
Ionosphere images from Alouette satellites - Dataset Dataset PNG No linguistic content; Not applicable Access
Data specifications Alouette-I Guide DOCX English Access
Data specifications Alouette-I Guide DOCX French Access
Alouette 1 data restoration Guide DOCX English Access
Alouette 1 data restoration Guide DOCX French Access
Reference Sheet Dataset XLSX No linguistic content; Not applicable Access
Reference Sheet Dataset CSV No linguistic content; Not applicable Access
Microfiches Dataset JPG No linguistic content; Not applicable Access

Comments (3)

Pour quand est du la prochaine update des datas?

Bonjour Jean-Sebastien, Nous tenons à vous remercier de nous avoir fait parvenir votre demande par courriel. Votre message a été envoyé au ministère à qui appartient les données. Nous communiquerons avec vous de nouveau dès que nous aurons de leurs nouvelles. Nous vous prions d’agréer l’expression de nos sentiments les meilleurs.

Bonjour Jean-Sébastien, L’Agence spatiale canadienne a mis à jour pour le jeu de données Alouette-I avec plus de 150 000 images sur le 9 septembre 2017. D’autres mises à jour seront fournis aux utilisateurs de données au cours des prochains mois.