FTS Measurements of Submillimeter-Wave Atmospheric Opacity at Pampa la Bola

Publications of the Astronomical Society of Japan

Matsushita, Satoki¹  Sakamoto, Akihiro²  Matsuo, Hiroshi² 

[1] Department of Astronomical Science, The Graduate University for Advanced Studies, Nobeyama Radio Observatory, Minamimaki, Minamisaku, Nagano 384-1305;Nobeyama Radio Observatory, Minamimaki, Minamisaku, Nagano 384-1305

关键词: "Earth: atmosphere";    Instruments;    Spectroscopy;    "Submillimeter-wave: opacities";   

DOI  :  10.1093/pasj/50.3.359

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

Thefirstmeasurementsofsubmillimeter-waveatmosphericopacityspectraatthePampalaBolasite(NorthernChile,Atacama,4800maltitude)havebeenperformedduringthewinterseasonusingaFouriertransformspectrometer(FTS).Atmosphericemissionspectra,asafunctionofairmass,weremeasuredundervariousweatherconditions.Atmosphericopacitywasevaluatedfromskytemperatureatthezenithaswellasfromtippingmeasurements,whichareindependentmeasuresbutgiveconsistentresults.Correlationdiagramsbetween220GHzand345GHz,410GHz,492GHz,675GHz,691GHz,809GHz,875GHzareshown.Correlationsbetweenmillimeter-waveandsubmillimeter-waveopacitiesgetworsewhen220GHzopacityislargerthan0.1.Deviationsfromtheopacitycorrelationateachfrequencyshowgoodcorrelationsthemselves,buthavedifferentrelativevariationsateachfrequency.Thisindicatesthatatmospherictransparencycannotbecharacterizedonlybymillimeter-waveopacity,butrequiressimultaneousopacitymeasurementsatmillimeterandsubmillimeter-wavelengths.

【 授权许可】

Unknown