February 27, 2017

Payload

The payload comprises a Sub-Millimeter wave Radiometer (SMR) and an optical spectrometer with an ultraviolet near infrared spectroscopy capability (OSIRIS).

The radiometer was fed by a 1.1 m radio telescope and was used for both the astronomy and aeronomy parts of the mission.

By designing the radiometer with a frequency coverage of approximately 118.25 - 119.25 GHz, 486 - 504 GHz and 541 - 580 GHz it can fulfil the requirements of both scientific disciplines. The receiver was equipped with an acousto-optical spectrometer (AOS) and two hybrid correlator spectrometers (CA1 and CA2).
The maximum instantaneous banswidth is 1 Ghz. There will be two selectable frequency resolutions, 1 Mhz and 150 Khz, respectively.

SMR main characteristics

Frequencies  118.25 - 119.25 GHz, 486.1 - 503.9 GHz, 541.0 - 580.4 GHz
Bandwidth100 MHz to 1 GHz
Resolution0.1 MHz to 1 MHz
Sensitivity1 K in 1 MHz with S/N = 5 after 15 mn

The OSIRIS ultraviolet-near infrared spectrometer was only used for aeronomy observations. The design assumes as a goal a wavelength coverage between 200 - 800 nm, 1.19 - 1.39 µm and 1.43 - 1.60 µm. The resolving power is assumed to be between 55 and 900.

OSIRIS main characteristics

Wavelengths280 - 800 nm and 1,270 nm
Optical Resolution  1 nm
IR Resolution10 nm
Aperture10 cm²
FOV0.02° x 0.75°