Physikalisch-Metorologisches Observatorium Davos -- World Radiation Center pmod-wrc
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PICARD

Simultaneous measurements of the solar diameter, differential rotation,
solar constant and of their variabilities. Consequences for Earth climate and the internal structure of the Sun.



Scientific objectives:

>> Confirm diameter variations (and validate ground measurements and their accuracy)
>> Establish relation diameter/global irradiance/differential rotation
>> Study their variabilities and, if their amplitude allows, detect g-modes
>> Oblateness measure and solar shape to higher orders (dynamo and convection)
>> Provide Space Weather solar activity full Sun images with 1" resolution


Three instruments:

SODISM for the diameter measure (2 mas) and differential rotation

SOVAP for the solar constant (TSI)

PREMOS for flux monitoring in selected UV and visible spectral bands

PREMOS is being built by PMOD/WRC

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Dorfstrasse 33, CH-7260 Davos Dorf, Phone +41 58 467 51 11, Fax +41 58 467 51 00 www.pmodwrc.ch
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