In-orbit performance of<i>Herschel</i>-HIFI

Roelfsema, Peter; Helmich, Frank; Teyssier, D.; Ossenkopf, V.; Morris, P.; Olberg, M.; Shipman, R.; Risacher, C.; Akyilmaz, M.; Assendorp, R.; Avruch, I. M.; Beintema, D. A.; Biver, Nicolás; Boogert, A. C. A.; Borys, C.; Braine, J.; Caris, M.; Caux, E.; Cernicharo, J.; Cœur-Joly, O.; Comito, C.; Lange, Gert de; Delforge, B.; Dieleman, P.; Dubbeldam, L.; Graauw, Th. de; Edwards, K.; Fich, M.; Flederus, F.; Gal, C.; Giorgio, A. Di; Herpin, Fabrice; Higgins, Daniel Ronan; Hoac, A.; Huisman, R.; Jarchow, Christopher; Jellema, Willem; Jonge, A. de; Kester, D. J. M.; Klein, T.; Kooi, J.; Krämer, C.; Laauwen, W. M.; Larsson, Bengt; Leinz, C.; Lord, S. D.; Lorenzani, A.; Luinge, W.; Marston, A. P.; Martı́n-Pintado, J.; McCoey, C.; Melchior, M.; Michalska, Małgorzata; Moreno, R.; Müller, H. S. P.; Nowosielski, W.; Okada, Yoko; Orleański, P.; Phillips, T. G.; Pearson, J. C.; Rabois, D.; Ravera, Laurent; Rector, John; Rengel, Miriam; Sagawa, Hideo; Salomons, W.; Sánchez-Suárez, E.; Schieder, R.; Schlöder, F.; Schmülling, F.; Soldati, Mauro; Stützki, J.; Thomas, Brian C.; Tielens, A. G. G. M.; Vastel, C.; Wildeman, K.; Xie, Qingsheng; Xilouris, E. M.; Wafelbakker, C. K.; Whyborn, N.; Zaal, P.; Bell, T. A.; Bjerkeli, P.; Beck, E. De; Cavalié, T.; Crockett, N. R.; Hily-Blant, Pierre; Kama, M.; Kamiński, T.; Leflóch, B.; Lombaert, R.; Luca, Massimo De; Makai, Z.; Marseille, M.; Nagy, Z.; Pacheco, S.; Wiel, M. H. D. van der; Wang, S.; Yıldız, U. A.

doi:10.1051/0004-6361/201015120

Cited by 212 publications

(53 citation statements)

References 11 publications

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“…12 All intensities reported here have been corrected for the HIFI main beam efficiency of 75% and 74% at 550 and 980 GHz, respectively (Roelfsema et al 2012). The FWHM beam size at the two frequencies is 38 and 22 .…”

Section: Observations and Resultsmentioning

confidence: 99%

A HERSCHEL STUDY OF D/H IN WATER IN THE JUPITER-FAMILY COMET 45P/HONDA-MRKOS-PAJDUŠÁKOVÁ AND PROSPECTS FOR D/H MEASUREMENTS WITH CCAT

Lis

Biver

Bockelée‐Morvan

et al. 2013

ApJ

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We present Herschel observations of water isotopologues in the atmosphere of the Jupiter-family comet 45P/Honda-Mrkos-Pajdušáková. No HDO emission is detected, with a 3σ upper limit of 2.0 × 10 −4 for the D/H ratio. This value is consistent with the earlier Herschel measurement in the Jupiter-family comet 103P/Hartley 2. The canonical value of 3 × 10 −4 measured pre-Herschel in a sample of Oort-cloud comets can be excluded at a 4.5σ level. The observations presented here further confirm that a diversity of D/H ratios exists in the comet population and emphasize the need for additional measurements with future ground-based facilities, such as CCAT, in the post-Herschel era.

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Section: Observations and Resultsmentioning

confidence: 99%

A HERSCHEL STUDY OF D/H IN WATER IN THE JUPITER-FAMILY COMET 45P/HONDA-MRKOS-PAJDUŠÁKOVÁ AND PROSPECTS FOR D/H MEASUREMENTS WITH CCAT

Lis

Biver

Bockelée‐Morvan

et al. 2013

ApJ

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“…The Cassini Radio and Plasma Wave Science (RPWS/LP) measurements have reported an electronic temperature of 500 K (Ågren et al 2009;Galand et al 2010) over 950-1100 km. Such a value is surprisingly high, because electronic temperatures closer to the ∼150 K gas temperature are expected below ∼1050 km (Richards et al 2011). We therefore considered both T e = 150 K and T e = 500 K, giving k 1a = k 1b = 1.5 × 10 −7 cm 3 s −1 and 6.90 × 10 −8 cm 3 s −1 , respectively (Semaniak et al 2001).…”

Section: Discussionmentioning

confidence: 99%

First detection of hydrogen isocyanide (HNC) in Titan’s atmosphere

Moreno

Lellouch

Lara

et al. 2011

A&A

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We report on the first identification of hydrogen isocyanide (HNC) in Titan's atmosphere, from observations using the HIFI instrument on the Herschel Space Observatory. An emission line from the HNC J = 6 → 5 rotational transition at 543.897 GHz was measured in Titan on June 14 and December 31, 2010. Radiative transfer modeling indicates that the bulk of HNC is located above 400 km, with a column density in the range (0.6−1.5) × 10 13 cm −2 , but the observations cannot establish its vertical profile. In particular HNC could be restricted to the upper thermosphere (∼1000 km), in which case its local abundance relative to HCN could be as high as ∼0.3. HNC is probably formed mostly at ionospheric levels (950-1150 km) from dissociative recombination of HCNH + and possibly other heavier nitrile ions. Ionospheric loss of HNC occurs by protonation with XH + ions. Additional formation (e.g. from N( 4 S) + 3 CH 2 ) and loss routes (e.g. from isomerization to HCN) in the neutral atmosphere remain to be investigated.

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“…The 3.5 meter satellite optics are patterned to match the Herschel Space Observatory [12] and the 12-m ground aperture matches a single element of the ALMA telescope [13].…”

Section: E Aperture and Transceiver Parametersmentioning

confidence: 99%

Modeling of Terabit Geostationary Terahertz Satellite Links From Globally Dry Locations

Suen

Fang

Denny

et al. 2015

IEEE Trans. THz Sci. Technol.

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Abstract-While terahertz (THz) communication systems, operating from 100 GHz to 1 THz, have the potential to exploit wide swaths of unused spectrum for ultra-high bitrate communication, there are significant challenges. Particularly, the strong absorption of water vapor can result in very high atmospheric attenuation. We modeled a ground to geostationary satellite link and found that using large aperture THz stations, patterned after the 12.5 m Atacama Large Microwave Array dish and the 3.5 m Herschel Space Observatory optics, worst 10th percentile data rates in excess of one terabit per second in the THz bands are possible. The key is to site ground stations in dry regions. We locate these by coupling our link model, which selects optimum modulation and carrier bandwidth, with global, high-resolution satellite water vapor measurements. We present detailed maps showing modeled link performance over the surface of the Earth. Smaller apertures on aircraft and balloons are also able to exceed 1 terabit/second due to their location above nearly all water vapor. Compared to free-space optical links, evidence suggests THz systems are superior where fog, cloud cover and clear-air turbulence are of concern.

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In-orbit performance ofHerschel-HIFI

Cited by 212 publications

References 11 publications

A HERSCHEL STUDY OF D/H IN WATER IN THE JUPITER-FAMILY COMET 45P/HONDA-MRKOS-PAJDUŠÁKOVÁ AND PROSPECTS FOR D/H MEASUREMENTS WITH CCAT

A HERSCHEL STUDY OF D/H IN WATER IN THE JUPITER-FAMILY COMET 45P/HONDA-MRKOS-PAJDUŠÁKOVÁ AND PROSPECTS FOR D/H MEASUREMENTS WITH CCAT

First detection of hydrogen isocyanide (HNC) in Titan’s atmosphere

Modeling of Terabit Geostationary Terahertz Satellite Links From Globally Dry Locations

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