Segev BenZvi
(University of Wisconsin--Madison)
9/13/10, 9:00 AM
Intro
Prof.
Christopher Stubbs
(Harvard University)
9/13/10, 9:30 AM
Astronomical Monitoring I
I will provide an overview of the motivation for direct determination of atmospheric transmission, from the standpoint of broadband photometric measurements. The primary sources of variability (or unpredictability) in transmission are clouds, aerosols and water vapor. I will review our approach to date, and the results we have obtained from initial prototype instruments.
Peter Zimmer
(University of New Mexico)
9/13/10, 10:45 AM
Astronomical Monitoring II
Ground-Based Telescopes supported by lidar and calibrated spectrophotometry can attain levels of precision for all-sky photometry previously only attainable from space-based instruments, with uncertainties dominated by fundamental photon counting statistics and detector noise. Earth’s atmosphere is a wavelength-, directionally- and time-dependent turbid refractive element for every...
John Woodward
(NIST)
9/13/10, 11:15 AM
Astronomical Monitoring II
NIST has undertaken a campaign to spectrophotometrically calibrate a suite of standard stars for top-of-the-atmosphere flux to a precision of better than 1%. We will describe our experimental approach and show some preliminary results. In addition to high quality spectrophotometric measurements, this project requires precise measurements of the atmospheric transmission in both the horizontal...
Ralf Bennartz
(UW-Madison)
9/13/10, 2:00 PM
Atmospheric Profiles and Transmission
This talk will cover cover three areas potentially of interest to the workshop:
* Numerical Weather Forecasting Models estimates of temperature/water vapor profiles from satellite
* Remote sensing of temperature/water vapor profiles from satellite.
* Broad-band and monochromatic transmittance calculations and radiative transfer in the visible and near-infrared with special...
Bianca Keilhauer
(KIT)
9/13/10, 2:45 PM
Atmospheric Profiles and Transmission
B. Keilhauer, D. Epperlein, M. Will for the Pierre Auger Collaboration
For the reconstruction of extensive air showers, the atmospheric conditions at the site of the observatory have to be known quite well. This is particularly true for reconstructions based on data obtained by the fluorescence technique. For these data not only the weather conditions near ground are relevant, most...
Gary Swenson
(U of Illinois - Champaign Urbana)
9/13/10, 4:15 PM
Lidar Techniques and Measurements
The Remote Sensing and Space Science group at the U of I has developed an upper atmospheric observatory on Cerro Pachon, beginning operation in Sep, 2009. Passive instrumentation includes mesospheric airglow allsky imagers of OH (including 16 micron), airglow photometers, a meteor radar, and an Na resonance lidar.
Emmanuel Fokitis
(Nat Tech Athens)
9/13/10, 4:45 PM
Lidar Measurements in UV
P. Fetfatzis, E. Fokitis, V. Gika, G.Koutelieris, G.Koutsourakis, H. Koubli, S. Maltezos, N. Maragos, A. Aravantinos,, M. Kompitsas
This work describes the HSRL activity at NTUA and the possibility to receive simultaneously data with a RAMAN lidar operating at NTUA campus. We believe that such a preliminary study would be a useful study as the hardware for RAMAN LIDAR is already available...
Georges Vasileiadis
(LPTA/CNRS)
9/13/10, 5:15 PM
Lidar Measurements in UV
Maria Monasor
9/14/10, 9:00 AM
Atmospheric Light Production
The fluorescence yield -- the number of photons produced per unit of deposited energy by nitrogen fluorescence as air shower particles move through air -- is a crucial ingredient in the reconstruction of air shower parameters using the fluorescence technique. Several values of the absolute fluorescence yield, as well as the parameters which determine its dependence on atmospheric conditions...
Lawrence Wiencke
9/14/10, 9:30 AM
Atmospheric Monitoring Programs I
The Pierre Auger Observatory uses the atmosphere as a giant calorimeter to measure extensive air showers produced by the highest energy particles known to exist. The Southern hemisphere site is operational and includes an array of instruments that monitor the troposphere above the 3000 km^2 site. A Northern hemisphere site of 20,000 km^2 is planned. This talk will review the atmospheric...
Cameron Rulten
9/14/10, 10:00 AM
Atmospheric Monitoring Programs I
A short talk on the atmospheric monitoring efforts undertaken at the H.E.S.S. site in Namibia and how the data is used in this ground-based gamma-ray astronomy experiment. Particular focus will be given toward single scattering lidars and the extinction of Cherenkov light due to low-level aerosol populations.
Sam Nolan
9/14/10, 10:50 AM
Atmospheric Monitoring Programs II
The Cherenkov Telescope Array (CTA) is the next generation instrument in ground-based gamma-ray astronomy. It is just coming to the end of a 3 year design study, and in this talk we will discuss the detailed simulation studies performed to assess the need for atmospheric monitoring and the methods by which correction for atmospheric variation may be achieved.
Alicia Lopez Oramas
9/14/10, 11:20 AM
Atmospheric Monitoring Programs II
The use of a Raman LIDAR together with Image Air Cherenkov Telescopes (IACT) would allow to improve the duty cycle and reduce systematical uncertainties of the latter. The Raman LIDARs allow the monitoring of the atmospheric transmission probability with a quite good accuracy but the altitude range needed by the IACT is challenging, 20 km. A Raman LIDAR is being developed at IFAE for CTA by...
Martin Will
9/14/10, 11:50 AM
Atmospheric Monitoring Programs II
M. Will, S. BenZvi, B. Keilhauer, M. Prouza and A. Tonachini for the Pierre Auger Collaboration
The Pierre Auger Observatory measures extensive air showers from interactions of cosmic rays with Earth's atmosphere. More than 1600 Surface Detectors (SD) sample the secondary shower particles that reach the ground while 27 Fluorescence Detectors (FD) constantly scan the night sky for faint...
David Starbuck
9/14/10, 12:20 PM
Atmospheric Monitoring Programs II
Laura Valore
9/14/10, 2:00 PM
Aerosol Properties
Maria Isabel Micheletti
9/14/10, 2:30 PM
Aerosol Properties
Micheletti, María Isabel, Freire, Martín, Coco, Michael, Wiencke, Lawrence, Piacentini, Rubén
We performed the first aerosol concentration measurements at the Auger North site at Lamar, Colorado, during summer 2010, with the Grimm 1.109 spectrometer. We evaluate the time evolution –along the hours of the days and the days of the measurement period– of the concentrations and their mean and...
Karim Louedec
9/14/10, 3:00 PM
Aerosol Properties
In the Pierre Auger Observatory, the Central Laser Facility (or CLF) emits all along the night laser shots in the field of view of the four fluorescence buildings. The goal of this talk is to show how it is possible to monitor the aerosols during the night. Two obtained quantities should be present: the Aerosol Phase Function (linked to the probability density function of the scattering...
Johana Chirinos
9/14/10, 4:00 PM
Cloud Identification and Monitoring
We describe a new method of identifying clouds over the Pierre Auger Observatory using infrared data from the Imager instrument on the GOES-12 satellite. For the pixel covering the Central Laser Facility(CLF) we compare cloud identifications with this method to those made with the Fluorescence Detector observations of CLF vertical laser events. The methods agree. We develop cloud probability...
Jacques Sebag
9/14/10, 4:30 PM
Cloud Identification and Monitoring
