Dr. Antonia Maria Varela Perez Profile

Dr. Antonia Maria Varela Perez

at Instituto de Astrofísica de Canarias

SPIE Involvement:

Author

Publications (8)

Proceedings Article | 18 July 2016 Paper

Precipitable Water Vapour at the Canarian Observatories (Teide and Roque de los Muchachos) from routine GPS

Julio Castro-Almazán, Casiana Muñoz-Tuñón, Begoña García-Lorenzo, Gabriel Pérez-Jordán, Antonia Varela, Ignacio Romero

Proceedings Volume 9910, 99100P (2016) https://doi.org/10.1117/12.2232646

KEYWORDS: Global Positioning System, Observatories, Antennas, Calibration, Observatories, Telescopes, Astronomy, Astronomical telescopes, Receivers, Opacity, Stars

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Proceedings Article | 25 October 2007 Paper

Use of satellite data for astronomical site characterization

A. Varela, C. Bertolin, C. Muñoz-Tuñón, J. Fuensalida, S. Ortolani

Proceedings Volume 6745, 674508 (2007) https://doi.org/10.1117/12.737346

KEYWORDS: Aerosols, Satellites, Clouds, Atmospheric particles, Astronomy, Spatial resolution, Observatories, MODIS, Artificial intelligence, Mass attenuation coefficient

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Proceedings Article | 23 June 2006 Paper

Tropospheric wind regimes and site topography effects: importance for site characterization

Antonia Varela, Casiana Muñoz-Tuñón, Begoña García-Lorenzo, Jesús Fuensalida

Proceedings Volume 6267, 62671X (2006) https://doi.org/10.1117/12.671387

KEYWORDS: Observatories, Databases, Lanthanum, Meteorology, Atmospheric turbulence, Climatology, Astronomy, Image quality, Telescopes, Environmental sensing

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Proceedings Article | 30 November 2004 Paper

Non-correlation between atmospheric extinction coefficient and TOMS aerosol index at the Canarian Observatories

Antonia Varela, Jesús Fuensalida, Casiana Munoz-Tunon, Jose Rodriguez Espinosa, Begona Garcia-Lorenzo, Emilio Cuevas

Proceedings Volume 5571, (2004) https://doi.org/10.1117/12.565490

KEYWORDS: Aerosols, Artificial intelligence, Atmospheric particles, Observatories, Mass attenuation coefficient, Astronomy, Satellites, Spatial resolution, Clouds, Earth's atmosphere

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Proceedings Article | 11 November 2004 Paper

Climate diagnostic archives: an approach to ELT site selection

Begona Garcia-Lorenzo, Jesus Fuensalida, Esteban Mendizabal, Casiana Munoz-Tunon, Antonia Varela

Proceedings Volume 5572, (2004) https://doi.org/10.1117/12.565513

KEYWORDS: Climatology, Diagnostics, Lanthanum, Data archive systems, Databases, Astronomy, Turbulence, Data modeling, Meteorology, Adaptive optics

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Proceedings Article | 28 September 2004 Paper

Climatological databases as a tool for the ELT site selection

Begona Garcia-Lorenzo, Jesus Fuensalida, Esteban Mendizabal, Casiana Munoz-Tunon, Antonia Varela

Proceedings Volume 5489, (2004) https://doi.org/10.1117/12.553775

KEYWORDS: Climatology, Lanthanum, Diagnostics, Databases, Data archive systems, Astronomy, Data modeling, Meteorology, Adaptive optics, Turbulence

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Proceedings Article | 28 September 2004 Paper

Comparison of the aerosol index from satellites and the atmospheric extinction coefficient above the Canarian Observatories

Antonia Varela, Jesus Fuensalida, Casiana Munoz-Tunon, Jose Rodriguez Espinosa, Begona Garcia-Lorenzo, Emilio Cuevas

Proceedings Volume 5489, (2004) https://doi.org/10.1117/12.555854

KEYWORDS: Aerosols, Atmospheric particles, Observatories, Artificial intelligence, Mass attenuation coefficient, Satellites, Astronomy, Atmospheric optics, Clouds, Spatial resolution

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Satellite data measuring aerosols over the Canary Islands need to be correctly interpreted in accordance with the spatial resolution and spectroscopic channels used. In situ data are still a necessary reference for calibrating and interpreting the aerosol index provided by different spectrometers onboard satellites. Most of the airmass flux component arriving at the Canarian Archipelago comes from the North Atlantic Ocean and consists of sea aerosols, i.e. absorbent chloride in the UV which does not affect the extinction in the visible range. African dust intrusions affect the western and eastern Canary Islands differently. Moreover, the presence of a stable inversion layer and the sharp orography of the western islands (La Palma at Tenerife) produce different mass flux patterns in the low (mixing) layers closer to the sea and in the median-upper (or free) troposphere layer. The aerosol index provided by the TOMS (Total Ozone Mapping Spectrometer) is one of the most widely accepted products to detect the daily aerosol content. On the other hand, several techniques have been developed in situ to characterize the presence of dust locally at the Canarian Observatories. In particular, a parameter related to sky transparency, the atmospheric extinction coefficient, has been measured at the Roque de los Muchachos Observatory (ORM) on La Palma since 1984 by the Carslberg Automatic Meridian Circle Telescope (CAMC). In situ aerosols are also available for the Teide Observatory (OT) on Tenerife, from 1986 onwards. In this work we compare aerosol index data of TOMS/Earth Probe observations and atmospheric optical extinction coefficient from CAMC in the period 1996-2004. A preliminary comparison of both techniques (in situ and remote) is discussed in this paper, showing there is no linear correlation between the aerosol index and the extinction coefficient. Here, we present an interpretation of different situations arising and discuss critically the correct interpretation of the aerosol index and images provided by the TOMS in accordance with the dust presence over the Observatories.

Proceedings Article | 7 July 2004 Paper

The influence of spot saturation on DIMM seeing measurements

Antonia Varela, Casiana Munoz-Tunon, Jean Vernin

Proceedings Volume 5382, (2004) https://doi.org/10.1117/12.566376

KEYWORDS: Error analysis, Telescopes, Sensors, Stars, Prototyping, CCD cameras, Data modeling, Astrophysics, Optical instrument design, Electronics

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Showing 5 of 8 publications

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