Results 191 to 200 of about 2,790,834 (259)

Evolution of Organic Aerosols in the Atmosphere

Science, 2009
Framework for Change Organic aerosols make up 20 to 90% of the particulate mass of the troposphere and are important factors in both climate and human heath.
J. Jimenez, M. Canagaratna, N. Donahue, A. Prévôt, Q. Zhang, J. Kroll, P. DeCarlo, J. Allan, H. Coe, N. Ng, A. Aiken, K. Docherty, I. Ulbrich, A. Grieshop, A. Robinson, J. Duplissy, J. D. Smith, K. Wilson, V. Lanz, C. Hueglin, Y. Sun, J. Tian, A. Laaksonen, T. Raatikainen, J. Rautiainen, P. Vaattovaara, M. Ehn, M. Kulmala, J. Tomlinson, D. R. Collins, M. Cubison, J. Dunlea, J. A. Huffman, T. Onasch, M. Alfarra, P. Williams, K. Bower, Y. Kondo, J. Schneider, F. Drewnick, S. Borrmann, S. Weimer, K. Demerjian, D. Salcedo, L. Cottrell, R. Griffin, A. Takami, T. Miyoshi, S. Hatakeyama, A. Shimono, J. Y. Sun, Y. M. Zhang, K. Džepina, J. Kimmel, D. Sueper, J. Jayne, S. Herndon, A. Trimborn, L. Williams, E. Wood, A. Middlebrook, C. Kolb, U. Baltensperger, D. Worsnop   +63 more
semanticscholar   +1 more source

Loss of the Martian atmosphere to space: Present-day loss rates determined from MAVEN observations and integrated loss through time

Icarus (New York, N.Y. 1962), 2018
Observations of the Mars upper atmosphere made from the Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft have been used to determine the loss rates of gas from the upper atmosphere to space for a complete Mars year (16 Nov 2014 – 3 Oct 2016 ...
B. Jakosky, D. Brain, M. Chaffin, S. Curry, J. Deighan, J. Grebowsky, J. Halekas, F. Leblanc, R. Lillis, J. Luhmann, L. Andersson, N. André, D. Andrews, D. Baird, D. Baker, J. Bell, M. Benna, D. Bhattacharyya, S. Bougher, C. Bowers, P. Chamberlin, J. Chaufray, J. Clarke, G. Collinson, M. Combi, J. Connerney, K. Connour, J. Correira, K. Crabb, F. Crary, T. Cravens, M. Crismani, G. Delory, R. Dewey, G. DiBraccio, C. Dong, Yaxue Dong, P. Dunn, H. Egan, M. Elrod, S. England, F. Eparvier, R. Ergun, A. Eriksson, T. Esman, J. Espley, S. Evans, K. Fallows, X. Fang, M. Fillingim, C. Flynn, A. Fogle, C. Fowler, J. Fox, M. Fujimoto, P. Garnier, Z. Girazian, H. Groeller, J. Gruesbeck, O. Hamil, K. Hanley, T. Hara, Y. Harada, Jacobus Hermann, M. Holmberg, G. Holsclaw, S. Houston, S. Inui, S. Jain, R. Jolitz, A. Kotova, T. Kuroda, D. Larson, Yuni Lee, C. Lee, F. Lefévre, C. Lentz, D. Lo, R. Lugo, Yingjuan Ma, P. Mahaffy, M. Marquette, Y. Matsumoto, M. Mayyasi, C. Mazelle, W. McClintock, J. Mcfadden, A. Medvedev, M. Mendillo, K. Meziane, Z. Milby, D. Mitchell, R. Modolo, F. Montmessin, A. Nagy, H. Nakagawa, C. Narvaez, K. Olsen, D. Pawlowski, W.K. (Bill) Peterson, A. Rahmati, K. Roeten, N. Romanelli, S. Ruhunusiri, C. Russell, S. Sakai, N. Schneider, K. Seki, R. Sharrar, S. Shaver, D. Siskind, M. Slipski, Y. Soobiah, M. Steckiewicz, M. Stevens, I. Stewart, A. Stiepen, S. Stone, V. Tenishev, N. Terada, K. Terada, E. Thiemann, R. Tolson, G. Tóth, Jeffrey Trovato, M. Vogt, T. Weber, P. Withers, Shaosui Xu, R. Yelle, Erdal Yiğit, R. Zurek   +131 more
semanticscholar   +1 more source

Absence of a thick atmosphere on the terrestrial exoplanet LHS 3844b

Nature, 2019
Most known terrestrial planets orbit small stars with radii less than 60 per cent of that of the Sun1,2. Theoretical models predict that these planets are more vulnerable to atmospheric loss than their counterparts orbiting Sun-like stars3–6.
L. Kreidberg, D. Koll, C. Morley, R. Hu, L. Schaefer, D. Deming, K. Stevenson, J. Dittmann, A. Vanderburg, D. Berardo, Xueying Guo, K. Stassun, I. Crossfield, D. Charbonneau, D. Latham, A. Loeb, G. Ricker, S. Seager, R. Vanderspek   +18 more
semanticscholar   +1 more source

Sun Imaging though the Martian Atmosphere

2008 IEEE Aerospace Conference, 2008
This paper discusses the sun images acquired with the panoramic cameras (pancam) on the Mars exploration rovers. The mission goals, the camera design, the data processing and the results are discussed. Each of the two rovers has two cameras, one with a bandpass filter centered at 880 nm and one centered at 440 nm.
Carl Christian Liebe, James W. Alexander, Larry Scherr   +2 more
openaire   +1 more source

The Sun's immutable basal quiet atmosphere

Solar Physics, 2003
We employ limb darkening, spectral energy distribution (color), and center-disk spectrum line strength to investigate photospheric temporal variability. Current limb-darkening curves agree to 1% with past observations taken at different epochs extending back to 1975.
W. Livingston, L. Wallace
openaire   +1 more source

Turbulence in the Sun's Atmosphere

Nature, 1929
IT is well known that the density gradient in the solar chromosphere is vastly less than what it would be in ordinary gravitational equilibrium. This was a complete enigma until the advent of Milne's theory of selective radiation pressure in the case of ionised calcium.
openaire   +1 more source

Sun and Stellar Atmospheres

1992
Schwarzschild’s scientific contributions to the fields of solar physics and of the physics of stellar atmospheres were concentrated in two periods. The first began with his observation of the total solar eclipse of 1905 August 30 in Algeria, and covered the years 1905–1906. After several years break, he again became active in this field in 1913–1914.
openaire   +1 more source

Physics of the sun’s hot atmosphere

Journal of Astrophysics and Astronomy, 2006
This article briefly overviews the physics of the Sun’s hot atmosphere, using observations from recent solar spacecrafts: Yohkoh, SOHO, TRACE and RHESSI.
openaire   +1 more source

A sun glint heliostat for atmospheric spectroscopy

Review of Scientific Instruments, 1974
A simple arrangement based upon sun glint, the brilliant image of the sun behind a convex reflecting surface, is used to produce a nearly stationary image of the sun. Using a telescope mirror, this image is directed into a spectrometer and is spectrally analyzed for the purpose of remote sensing of trace species in our atmosphere.
A. E. S. Green, R. A. Sutherland, G. Ganguli   +2 more
openaire   +1 more source

The Sun and Its Atmosphere

2016
As a reminder, observing the Sun can be dangerous. Even extended naked eye observations can irritate the eye and possibly cause temporary sight impairment. The internationally recommended minimum safe protection level across the visible spectrum for extended exposure is ND3 (Neutral density #3). All the commercial white light solar filters available to
openaire   +1 more source