CHAIN

the Canadian High Arctic Ionospheric Network

Data Download

All CHAIN data is available via anonymous FTP or via Open Access Web requests.

FTP Access

• Access is by anonymous ftp ONLY
• Use server name: ftp.chain-project.net
• Username: ftp
• Password: Your email address.
  Preferably, your institutional email address.
  Invalid email addresses will be blocked.

Open Access Web Access

• URL is: http://www.chain-project.net/data
• No username or password is required.

Notes

• Previous accounts will continue to work until at least 2022-02-28
• Secure HTTP (https) and secure FTP (ftps) will be available in the near future.

GPS Data

All data is available from either the FTP site as described above or from the website http://www-chain-project.net/data as decribed above

Daily 30-second RINEX v2.11 observation files are in gps/data/daily/YYYY/DDD/YYo/ or gps/data/daily/YYYY/DDD/YYd/ for Hatanaka compressed files

Highrate 1-second RINEX v2.11 observation files are in gps/data/highrate/YYYY/DDD/

The binary GPS receiver files are archived below gps/data/raw/SSSS where:
- YYYY is the four-digit year
- SSSS is the 4-letter marker name
- DDD is the three-digit day of year
- YYo is the 2-digit year followed by the letter "o"
- YYd is the 2-digit year followed by the letter "d"
- MM is the 2-digit month
- DD is the 2-digit day of month
- HH is the 2-digit hour
- MM and SS which represent the minutes and seconds are typically 00 and 00

GISTM Data

In addition to the standard GNSS observables (pseduorange, phase, doppler and SNR) collected at 1 Hz, our receivers also operate as GNSS Ionospheric TEC and Scintiallation Monitors (GISTM) and collect (phase and amplitude) at 50Hz (occasionally 100Hz).

50Hz phase and amplitude are often summarized by using the scintillation indices, sigma_phi and S4 on a 1-miute interval.

ISMR files are available which contain sigma_phi and S4 along with other summary data available from gps/ismr

Access to the 50Hz phase and amplitude is only available via the binary receiver files. See above under GPS Data

Ionosonde (CADI) Data

The md1 and md2 CADI files are archived below /cadi/ST" where:
- ST is the 2-letter station abbreviation
- YYYY is the four-digit year
- YY is the 2-digit year
- MM is the 2-digit month
- DD is the 2-digit day of month

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