In Situ Navigation of Spacecraft Formations in High-Altitude and Extraterrestrial Orbits

2008 ◽  
Vol 45 (2) ◽  
pp. 299-308 ◽  
Author(s):  
Greg N. Holt ◽  
E. G. Lightsey
Keyword(s):  
High Altitude ◽  
Spacecraft Formations

In situ ozone measurements within the 1987 Antarctic ozone hole from a high-altitude ER-2 aircraft

1989 ◽  
Vol 94 (D14) ◽  
pp. 16547 ◽  
Author(s):  
M. H. Proffitt ◽  
M. J. Steinkamp ◽  
J. A. Powell ◽  
R. J. McLaughlin ◽  
O. A. Mills ◽  
...  
Keyword(s):  
High Altitude ◽  
Ozone Hole ◽  
Antarctic Ozone ◽  
Antarctic Ozone Hole

Molecular characterization and in situ detection of bacterial communities associated with rhizosphere soil of high altitude native Poaceae from the Andean Puna region

2010 ◽  
Vol 74 (10) ◽  
pp. 1177-1185 ◽  
Author(s):  
Marcela A. Ferrero ◽  
Eugenia Menoyo ◽  
Mónica A. Lugo ◽  
María A. Negritto ◽  
María E. Farías ◽  
...  
Keyword(s):  
High Altitude ◽  
Molecular Characterization ◽  
Bacterial Communities ◽  
Rhizosphere Soil ◽  
In Situ Detection

scholarly journals QA/QC Procedures for <i>in-Situ</i> Calibration of a High Altitude Automatic Weather Station: The Case Study of the AWS Pyramid, 5050 m asl, Khumbu Valley, Nepal

2014 ◽  
Vol 04 (05) ◽  
pp. 796-802 ◽  
Author(s):  
Elisa Vuillermoz ◽  
Gian Pietro Verza ◽  
Paolo Cristofanelli ◽  
Paolo Bonasoni ◽  
Guido Roggero ◽  
...  
Keyword(s):  
High Altitude ◽  
Weather Station ◽  
Automatic Weather Station

scholarly journals Spatial heterodyne observations of water (SHOW) from a high-altitude airplane: characterization, performance, and first results

2019 ◽  
Vol 12 (1) ◽  
pp. 431-455 ◽  
Author(s):  
Jeffery Langille ◽  
Daniel Letros ◽  
Adam Bourassa ◽  
Brian Solheim ◽  
Doug Degenstein ◽  
...  
Keyword(s):  
High Altitude ◽  
Water Vapour ◽  
Horizontal Resolution ◽  
Low Earth Orbit ◽  
Maximum Speed ◽  
Spectral Window ◽  
Heterodyne Spectroscopy ◽  
Laboratory Characterization ◽  
First Results

Abstract. The Spatial Heterodyne Observations of Water instrument (SHOW) is a limb-sounding satellite prototype that utilizes the Spatial Heterodyne Spectroscopy (SHS) technique, operating in a limb-viewing configuration, to observe limb-scattered sunlight in a vibrational band of water vapour within a spectral window from 1363 to 1366 nm. The goal is to retrieve high vertical and horizontal resolution measurements of water vapour in the upper troposphere and lower stratosphere. The prototype instrument has been configured for observations from NASA's ER-2 high-altitude airborne remote science airplane. Flying at a maximum altitude of ∼21.34 km with a maximum speed of ∼760 km h−1, the ER-2 provides a stable platform to simulate observations from a low-earth orbit satellite. Demonstration flights were performed from the ER-2 during an observation campaign from 15 to 22 July 2017. In this paper, we present the laboratory characterization work and the level 0 to level 1 processing of flight data that were obtained during an engineering flight performed on 18 July 2017. Water vapour profile retrievals are presented and compared to in situ radiosonde measurements made of the same approximate column of air. These measurements are used to validate the SHOW measurement concept and examine the sensitivity of the technique.

Effect of high-altitude exposure on myopic laser in situ keratomileusis

2001 ◽  
Vol 27 (12) ◽  
pp. 1937-1941 ◽  
Author(s):  
David A Boes ◽  
Alexander K Omura ◽  
Michael J Hennessy
Keyword(s):  
High Altitude ◽  
Laser In Situ Keratomileusis ◽  
Altitude Exposure

In Situ Measurement of High Altitude Spread-F Characteristics by Three Different Plasma Density Probes

1997 ◽  
Author(s):  
P. Muralikrishna ◽  
M.A. Abdu ◽  
J.H.A. Sobral ◽  
M.G.S. Aquino ◽  
D.C. Santana ◽  
...  
Keyword(s):  
High Altitude ◽  
Plasma Density ◽  
In Situ Measurement ◽  
Spread F

scholarly journals Comparison of the aerosol optical properties and size distribution retrieved by sun photometer with in situ measurements at midlatitude

2016 ◽  
Vol 9 (9) ◽  
pp. 4569-4585 ◽  
Author(s):  
Aurélien Chauvigné ◽  
Karine Sellegri ◽  
Maxime Hervo ◽  
Nadège Montoux ◽  
Patrick Freville ◽  
...  
Keyword(s):  
Remote Sensing ◽  
High Altitude ◽  
In Situ Measurements ◽  
Aerosol Extinction ◽  
The Sun ◽  
Near Surface ◽  
Atmospheric Column ◽  
Fine Mode ◽  
Sun Photometer

Abstract. Aerosols influence the Earth radiative budget through scattering and absorption of solar radiation. Several methods are used to investigate aerosol properties and thus quantify their direct and indirect impacts on climate. At the Puy de Dôme station, continuous high-altitude near-surface in situ measurements and low-altitude ground-based remote sensing atmospheric column measurements give the opportunity to compare the aerosol extinction measured with both methods over a 1-year period. To our knowledge, it is the first time that such a comparison is realised with continuous measurements of a high-altitude site during a long-term period. This comparison addresses to which extent near-surface in situ measurements are representative of the whole atmospheric column, the aerosol mixing layer (ML) or the free troposphere (FT). In particular, the impact of multi-aerosol layers events detected using lidar backscatter profiles is analysed. A good correlation between in situ aerosol extinction coefficient and aerosol optical depth (AOD) measured by the Aerosol Robotic Network (AERONET) sun photometer is observed with a correlation coefficient around 0.80, indicating that the in situ measurements station is representative of the overall atmospheric column. After filtering for multilayer cases and correcting for each layer optical contribution (ML and FT), the atmospheric structure seems to be the main factor influencing the comparison between the two measurement techniques. When the site lies in the ML, the in situ extinction represents 45 % of the sun photometer ML extinction while when the site lies within the FT, the in situ extinction is more than 2 times higher than the FT sun photometer extinction. Moreover, the assumption of a decreasing linear vertical aerosol profile in the whole atmosphere has been tested, significantly improving the instrumental agreement. Remote sensing retrievals of the aerosol particle size distributions (PSDs) from the sun photometer observations are then compared to the near-surface in situ measurements, at dry and at ambient relative humidities. When in situ measurements are considered at dry state, the in situ fine mode diameters are 44 % higher than the sun-photometer-retrieved diameters and in situ volume concentrations are 20 % lower than those of the sun-photometer-retrieved fine mode concentration. Using a parameterised hygroscopic growth factor applied to aerosol diameters, the difference between in situ and retrieved diameters grows larger. Coarse mode in situ diameters and concentrations show a good correlation with retrieved PSDs from remote sensing.

scholarly journals Maïdo observatory: a new high-altitude station facility at Reunion Island (21° S, 55° E) for long-term atmospheric remote sensing and in situ measurements

2013 ◽  
Vol 6 (10) ◽  
pp. 2865-2877 ◽  
Author(s):  
J.-L. Baray ◽  
Y. Courcoux ◽  
P. Keckhut ◽  
T. Portafaix ◽  
P. Tulet ◽  
...  
Keyword(s):  
High Altitude ◽  
Southern Hemisphere ◽  
Marine Boundary Layer ◽  
In Situ Measurements ◽  
Atmospheric Composition ◽  
Reunion Island ◽  
Atmospheric Measurements ◽  
Atmospheric Remote Sensing ◽  
Réunion Island

Abstract. Since the nineties, atmospheric measurement systems have been deployed at Reunion Island, mainly for monitoring the atmospheric composition in the framework of NDSC/NDACC (Network for the Detection of Stratospheric Change/Network for the Detection of Atmospheric Composition Change). The location of Reunion Island presents a great interest because there are very few multi-instrumented stations in the tropics and particularly in the southern hemisphere. In 2012, a new observatory was commissioned in Maïdo at 2200 m above sea level: it hosts various instruments for atmospheric measurements, including lidar systems, spectro-radiometers and in situ gas and aerosol measurements. This new high-altitude Maïdo station provides an opportunity: 1. to improve the performance of the optical instruments above the marine boundary layer, and to open new perspectives on upper troposphere and lower stratosphere studies; 2. to develop in situ measurements of the atmospheric composition for climate change surveys, in a reference site in the tropical/subtropical region of the southern hemisphere; 3. to offer trans-national access to host experiments or measurement campaigns for focused process studies.

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