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13 results on '"Achterberg, R. K"'

1. Titan's Atmospheric Temperatures, Winds, and Composition

Author

Flasar, F. M., Achterberg, R. K., Conrath, B. J., Gierasch, P. J., Kunde, V. G., Nixon, C. A., Bjoraker, G. L., Jennings, D. E., Romani, P. N., Simon-Miller, A. A., Bézard, B., Coustenis, A., Irwin, P. G. J., Teanby, N. A., Brasunas, J., Pearl, J. C., Segura, M. E., Carlson, R. C., Mamoutkine, A., Schinder, P. J., Barucci, A., Courtin, R., Fouchet, T., Gautier, D., Lellouch, E., Marten, A., Prangé, R., Vinatier, S., Strobel, D. F., Calcutt, S. B., Read, P. L., Taylor, F. W., Bowles, N., Samuelson, R. E., Orton, G. S., Spilker, L. J., Owen, T. C., Spencer, J. R., Showalter, M. R., Ferrari, C., Abbas, M. M., Raulin, F., Edgington, S., Ade, P., and Wishnow, E. H.

Published
2005

2. Temperatures, Winds, and Composition in the Saturnian System

Author

Flasar, F. M., Achterberg, R. K., Conrath, B. J., Pearl, J. C., Bjoraker, G. L., Jennings, D. E., Romani, P. N., Simon-Miller, A. A., Kunde, V. G., Nixon, C. A., Bézard, B., Orton, G. S., Spilker, L. J., Spencer, J. R., Irwin, P. G. J., Teanby, N. A., Owen, T. C., Brasunas, J., Segura, M. E., Carlson, R. C., Mamoutkine, A., Gierasch, P. J., Schinder, P. J., Showalter, M. R., Ferrari, C., Barucci, A., Courtin, R., Coustenis, A., Fouchet, T., Gautier, D., Lellouch, E., Marten, A., Prangé, R., Strobel, D. F., Calcutt, S. B., Read, P. L., Taylor, F. W., Bowles, N., Samuelson, R. E., Abbas, M. M., Raulin, F., Ade, P., Edgington, S., Pilorz, S., Wallis, B., and Wishnow, E. H.

Published
2005

3. Jupiter's Atmospheric Composition from the Cassini Thermal Infrared Spectroscopy Experiment

Author

Kunde, V. G., Flasar, F. M., Jennings, D. E., Bézard, B., Strobel, D. F., Conrath, B. J., Nixon, C. A., Bjoraker, G. L., Romani, P. N., Achterberg, R. K., Simon-Miller, A. A., Irwin, P., Brasunas, J. C., Pearl, J. C., Smith, M. D., Orton, G. S., Gierasch, P. J., Spilker, L. J., Carbon, R. C., Mamoutkine, A. A., Calcutt, S. B., Read, P. L., Taylor, F. W., Fouchet, T., Parrish, P., Barucci, A., Courtin, R., Coustenis, A., Gautier, D., Lellouch, E., Marten, A., Prangé, R., Biraud, Y., Ferrari, C., Owen, T. C., Abbas, M. M., Samuelson, R. E., Raulin, F., Ade, P., Césarsky, C. J., Grossman, K. U., and Coradini, A.

Published
2004

4. Less absorbed solar energy and more internal heat for Jupiter

Author

Li, Liming, Jiang, X., West, R. A., Gierasch, P. J., Perez-Hoyos, S., Sanchez-Lavega, A., Fletcher, L. N., Fortney, J. J., Knowles, B., Porco, C. C., Baines, K. H., Fry, P. M., Mallama, A., Achterberg, R. K., Simon, A. A., Nixon, C. A., Orton, G. S., Dyudina, U. A., Ewald, S. P., and Schmude, Jr., R. W.

Published
2018
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8. Exploring The Saturn System In The Thermal Infrared: The Composite Infrared Spectrometer

Author

Flasar, F. M., Kunde, V. G., Abbas, M. M., Achterberg, R. K., Ade, P., Barucci, A., B’ezard, B., Bjoraker, G. L., Brasunas, J. C., Calcutt, S., Carlson, R., C’esarsky, C. J., Conrath, B. J., Coradini, A., Courtin, R., Coustenis, A., Edberg, S., Edgington, S., Ferrari, C., Fouchet, T., Gautier, D., Gierasch, P. J., Grossman, K., Irwin, P., Jennings, D. E., Lellouch, E., Mamoutkine, A. A., Marten, A., Meyer, J. P., Nixon, C. A., Orton, G. S., Owen, T. C., Pearl, J. C., Prang’e, R., Raulin, F., Read, P. L., Romani, P. N., Samuelson, R. E., Segura, M. E., SHOWALTER, M. R., Simon-Miller, A. A., Smith, M. D., Spencer, J. R., Spilker, L. J., and Taylor, F. W.

Published
2004
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9. An intense stratospheric jet on Jupiter

Author

Flasar, F. M., Kunde, V. G., Achterberg, R. K., Conrath, B. J., Simon-Miller, A. A., Nixon, C. A., Gierasch, P. J., Romani, P. N., Bezard, B., Irwin, P., Bjoraker, G. L., Brasunas, J. C., Jennings, D. E., Pearl, J. C., Smith, M. D., Orton, G. S., Spilker, L. J., Carlson, R., Calcutt, S. B., Read, P. L., Taylor, F. W., Parrish, P., Barucci, A., Courtin, R., Coustenis, A., Gautier, D., Lellouch, E., Marten, A., Prange, R., Biraud, Y., Fouchet, T., Ferrari, C., Owen, T. C., Abbas, M. M., Samuelson, R. E., Raulin, F., Ade, P., Cesarsky, C. J., Grossman, K. U., and Coradini, A.

Subjects
Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Author(s): F. M. Flasar (corresponding author) [1]; V. G. Kunde [2]; R. K. Achterberg [3]; B. J. Conrath [4]; A. A. Simon-Miller [1]; C. A. Nixon [2]; P. J. Gierasch [...]

Published
2004
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10. Advanced Net Flux Radiometer for the Ice Giants.

Author

Aslam, S., Achterberg, R. K., Calcutt, S. B., Cottini, V., Gorius, N. J., Hewagama, T., Irwin, P. G., Nixon, C. A., Quilligan, G., Roos-Serote, M., Simon, A. A., Tran, D., and Villanueva, G.

Subjects
*FIELD programmable gate arrays, *APPLICATION-specific integrated circuits, *FLUX (Energy), *RADIOMETERS, *BANDPASS filters
Abstract

The design of an advanced Net Flux Radiometer (NFR), for inclusion as a payload on a future Ice Giants probe mission, is given. The Ice Giants NFR (IG-NFR) will measure the upward and downward radiation flux (hence net radiation flux), in seven spectral bands, spanning the range from solar to far infra-red wavelengths, each with a 5 ∘ Field-Of-View (FOV) and in five sequential view angles (± 80 ∘ , ± 45 ∘ , and 0 ∘ ) as a function of altitude. IG-NFR measurements within either Uranus or Neptune's atmospheres, using dedicated spectral filter bands will help derive radiative heating and cooling profiles, and will significantly contribute to our understanding of the planet's atmospheric heat balance and structure, tropospheric 3-D flow, and compositions and opacities of the cloud layers. The IG-NFR uses an array of non-imaging Winston cones integrated to a matched thermopile detector Focal Plane Assembly (FPA), with individual bandpass filters, housed in a diamond windowed vacuum micro-vessel. The FPA thermopile detector signals are read out in parallel mode, amplified and processed by a multi-channel digitizer application specific integrated circuit (MCD ASIC) under field programmable gate array (FPGA) control. The vacuum micro-vessel rotates providing chopping between FOV's of upward and downward radiation fluxes. This unique design allows for small net flux measurements in the presence of large ambient fluxes and rapidly changing ambient temperatures during the probe descent to ≥ 10 bar pressure. [ABSTRACT FROM AUTHOR]

Published
2020
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11. Thermal Emission From Saturn's Polar Cyclones.

Author

Achterberg, R. K., Flasar, F. M., Bjoraker, G. L., Hesman, B. E., Gorius, N. J. P., Mamoutkine, A. A., Fletcher, L. N., Segura, M. E., Edgington, S. G., and Brooks, S. M.

Abstract

Abstract: We have used data from the Cassini Composite Infrared Spectrometer to map the temperatures in Saturn's polar cyclones at the highest spatial resolution obtained during the Cassini mission. We find temperature contrasts of 7 K in the upper troposphere within 1.4° of both poles, roughly 50 percent larger than earlier measurements at lower spatial resolution. The polar hot spots weaken with depth, disappearing near 500 mbar. In the stratosphere, the polar hot spot becomes broader, extending 4° from the poles, and weakens with altitude disappearing near 1 mbar. A thermal relaxation model shows that the tropospheric hot spot is consistent with adiabatic heating from subsidence with a vertical velocity of about −0.05 mm/s above 500 mbar. The observed temperature gradients imply that the winds in the polar cyclone decay with increasing altitude over roughly three pressure scale heights above the 200‐mbar level. [ABSTRACT FROM AUTHOR]

Published
2018
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13. Temperature and Composition of Saturn's Polar Hot Spots and Hexagon.

Author

Ftetcher, L. N., Irwin, P. G. J., Orton, G. S., Teanby, N. A., Achterberg, R. K., Bjoraker, G. L., Read, P. L., Simon-Miller, A. A., Howett, C., de Kok, R., Bowtes, N., Calcutt, S. B., Hesman, B., and Flasar, F. M.

Subjects
*HOT spots (Astronomy), *HEXAGONS, *POLAR vortex, *SOLAR flares, *PHOSPHINE, *TROPOSPHERIC chemistry, *STRATOSPHERIC chemistry, *RADIO sources (Astronomy), *SATURN (Planet)
Abstract

Saturn's poles exhibit an unexpected symmetry in hot, cyclonic polar vortices, despite huge seasonal differences in solar flux. The cores of both vortices are depleted in phosphine gas, probably resulting from subsidence of air into the troposphere. The warm cores are present throughout the upper troposphere and stratosphere at both poles. The thermal structure associated with the marked hexagonal polar jet at 77°N has been observed for the first time. Both the warm cyclonic belt at 79°N and the cold anticyclonic zone at 75°N exhibit the hexagonal structure. [ABSTRACT FROM AUTHOR]

Published
2008
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