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|
|Bandwidth||100 MHz to 1 GHz|
|Resolution||0.1 MHz to 1 MHz|
|Sensitivity||1 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
|Wavelengths||280 - 800 nm and 1,270 nm|
|Optical Resolution||1 nm|
|IR Resolution||10 nm|
|FOV||0.02° x 0.75°|