Jacques Claas

Jacques Claas
Koninklijk Nederlands Meteorologisch Instituut | KNMI · Department of Climate Observations

PhD

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11
Publications
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2,550
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Publications

Publications (11)
Article
The ESA (European Space Agency) Sentinel-5 Precursor (S-5 P) is a low Earth orbit polar satellite to provide information and services on air quality, climate and the ozone layer in the timeframe 2015–2022. The S-5 P mission is part of the Global Monitoring of the Environment and Security (GMES) Space Component Programme. The payload of the mission...
Article
Full-text available
We present an improved tropospheric nitrogen dioxide column retrieval algorithm (DOMINO v2.0) for OMI based on better air mass factors (AMFs) and a correction for across-track stripes resulting from calibration errors in the OMI backscattered reflectances. Since October 2004, NO2 retrievals from the Ozone Monitoring Instrument (OMI), a UV/Vis nadir...
Article
Full-text available
The Ozone Monitoring Instrument (OMI) was launched on July 15, 2004 on the National Aeronautics and Space Administration's Earth Observing System Aura satellite. OMI is an ultraviolet-visible imaging spectrograph providing daily global coverage with high spatial resolution. This paper discusses the ground data processing software used for Level 0 t...
Chapter
EXOSAT X-ray data of the supernova remnant G292.0+1.8 reveal a two temperature structure if the data are fitted with a collisional-ionization-equilibrium model: kTlow=0.5 keV and kThigh=2.0 keV. This two temperature structure indicates the possible existence of non-equilibrium-ionization effects. There is a small indication (2 % statistical signifi...
Chapter
Recent data in several wavebands on the peculiar galactic object G70.7+1 .2 is reviewed. A new VLA map clearly shows the radio shell. Possible interpretations of the object include supernova remnant, nova shell, and nebula resulting from mass loss from a giant or supergiant, although each of these interpretations has its own difficulties.
Article
Full-text available
X-ray images show that the SNR RCW 86 consists of two emission regions. The electron temperature of both two regions is 3.4 keV. The low-energy flux (0.2-2 keV) is strongly enhanced compared to a simple thermal bremsstrahlung spectrum with Te = 3.4 keV fitted to the 2-10 keV data. This enhancement is most likely caused by nonequilibrium ionization...
Article
Full-text available
The paper presents a set of various data ranging from radio to X-ray wavelengths, including optical spectroscopy and infrared spectrophotometry, of the galactic source G70.7 + 1.2 whose nature has recently been assessed contradictorily. The observations definitely confirm the presence of a spherical shock wave expanding in a very dense environment....
Article
The Exosat observatory has detected the nucleus of NGC 1360 in four photometric energy bands. The data rules out that the emission is from blackbody origin. Initial fits made with LTE model atmosphere spectra require the presence of highly ionized oxygen and neon in the stellar atmosphere.
Article
A small, stable and low cost acousto-optical spectrometers for millimeter wave observations has been designed at the Astronomical Institute of Utrecht. The instrument has 2048 frequency channels in two bands with resolutions of 900 kHz and 125 kHz in overall bandwidths of 500 MHz and 50 MHz, respectively. The spectrometer fits in a 19 inch rack and...
Article
By using non ionization models, the analysis of EXOSAT low energy X-ray data (0.4 - 2 keV) of the supernova remnant RCW 86 reveals the following properties: a shell-like structure, consisting of two separate parts, producing relatively hard and soft X-rays respectively. The soft X-rays come from C-K and O-K emission lines which implies a low NH &la...

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