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Submm & THz Masatoshi Ohishi NAOJ. June 4, 2010IUCAF Summer School 20102 Low  absorption  High O2O2O2O2 H2OH2OH2OH2O O2O2O2O2 H2OH2OH2OH2O.

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Presentation on theme: "Submm & THz Masatoshi Ohishi NAOJ. June 4, 2010IUCAF Summer School 20102 Low  absorption  High O2O2O2O2 H2OH2OH2OH2O O2O2O2O2 H2OH2OH2OH2O."— Presentation transcript:

1 Submm & THz Masatoshi Ohishi NAOJ

2 June 4, 2010IUCAF Summer School 20102 Low  absorption  High O2O2O2O2 H2OH2OH2OH2O O2O2O2O2 H2OH2OH2OH2O

3 June 4, 2010IUCAF Summer School 20103

4 June 4, 2010IUCAF Summer School 20104

5 June 4, 2010IUCAF Summer School 20105 Rec ITU-R RA. 314 List of most important lines among observed 3,000/ possible 10,000 lines Frequency bands for Continuum observations Recommends to protect these bands Bands not listed in the Rec are also important for RAS

6 June 4, 2010IUCAF Summer School 20106

7 June 4, 2010IUCAF Summer School 20107 RA bands above 71 GHz

8 June 4, 2010IUCAF Summer School 20108 RR 2.1

9 June 4, 2010IUCAF Summer School 20109 Transmission in Submm Transmission measurement: Matsushita, S. et al., PASJ, 51, 603 (1999)

10 June 4, 2010IUCAF Summer School 201010 ALMA Project © NAOJ

11 11 5.565 The frequency band 275-1000 GHz may be used by administrations for experimentation with, and development of, various active and passive services. In this band a need has been identified for the following spectral line measurements for passive services: – radio astronomy service: 275 ‑ 323 GHz, 327 ‑ 371 GHz, 388 ‑ 424 GHz, 426 ‑ 442 GHz, 453 ‑ 510 GHz, 623 ‑ 711 GHz, 795 ‑ 909 GHz and 926-945 GHz; – Earth exploration-satellite service (passive) and space research service (passive): 275-277 GHz, 294 ‑ 306 GHz, 316 ‑ 334 GHz, 342 ‑ 349 GHz, 363 ‑ 365 GHz, 371 ‑ 389 GHz, 416 ‑ 434 GHz, 442 ‑ 444 GHz, 496 ‑ 506 GHz, 546 ‑ 568 GHz, 624 ‑ 629 GHz, 634 ‑ 654 GHz, 659 ‑ 661 GHz, 684 ‑ 692 GHz, 730 ‑ 732 GHz, 851 ‑ 853 GHz and 951 ‑ 956 GHz. Future research in this largely unexplored spectral region may yield additional spectral lines and continuum bands of interest to the passive services. Administrations are urged to take all practicable steps to protect these passive services from harmful interference until the date when the allocation Table is established in the above-mentioned frequency band. (WRC ‑ 2000)

12 June 4, 2010IUCAF Summer School 201012 Allocation > 275 GHz No allocation at present (only footnote 5.565) Agenda Item for WRC-2012 >AI 1.6 – to review RR 5.565 (Res. 950) >No Allocations >Rec ITU-R RA.1860 Preferred frequency bands for radio astronomical measurements in the range 1-3 THz  input from IAU Div.X through IUCAF

13 June 4, 2010IUCAF Summer School 201013 Use of submm / THz regions Radio astronomers actually observe in submm In submm region no com. company plans to introduce its service High atmospheric attenuation  easier to share bands PDN Rep. RA[THz-share]

14 June 4, 2010IUCAF Summer School 201014 The Earth at Night (optical)

15 June 4, 2010IUCAF Summer School 201015

16 June 4, 2010IUCAF Summer School 201016

17 June 4, 2010IUCAF Summer School 201017 Above 10 THz End of RR

18 June 4, 2010IUCAF Summer School 201018 Relevant Articles RR 1.5radio waves or hertzian waves: Electromagnetic waves of frequencies arbitrarily lower than 3 000 GHz, propagated in space without artificial guide. ITU Constitution, Article 12, 78 …. – by carrying out studies without limit of frequency range and adopting recommendations on radiocommunication matters.

19 June 4, 2010IUCAF Summer School 201019 Optical Communication Laser Communication by using f > 10 THz is under study (USA, Japan)  Interference at Optical/IR regions in near future ?

20 June 4, 2010IUCAF Summer School 201020 Usage GSO/GSO, GSO/non-GSO crosslinks Non-GSO/non-GSO crosslinks GSO-ground links See Rec. ITU-R S.1590 Technical and operational characteristics of satellites operating in the range 20-375 THz

21 June 4, 2010IUCAF Summer School 201021 bands

22 June 4, 2010IUCAF Summer School 201022 OIECTS by JAXA, Japan

23 June 4, 2010IUCAF Summer School 201023 RAS side Rec. ITU-R RA.1630 Technical and operational characteristics of ground-based astronomy systems for use in sharing studies with active services between 10 THz and 1 000 THz Lists major optical/IR astronomical observatories

24 Adaptive Optics June 4, 2010IUCAF Summer School 201024 = 589 nm (Na D2) = 589 nm (Na D2)

25 June 4, 2010IUCAF Summer School 201025 Collaboration with Optical/IR astronomers IAU GA in Sydney Com. 50 had a session with optical/IR people Several people agreed to work with Silence since then

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