A5075290678- Ionosphere and magnetosphere dynamics
- Atmospheric Ozone and Climate
- Solar and Space Plasma Dynamics
- Atmospheric chemistry and aerosols
- Spectroscopy and Laser Applications
- Geophysics and Gravity Measurements
- Astro and Planetary Science
- Atmospheric and Environmental Gas Dynamics
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Advanced Battery Materials and Technologies
- GNSS positioning and interference
- Image and Signal Denoising Methods
- Advancements in Battery Materials
- Extraction and Separation Processes
- Advanced Battery Technologies Research
- Atomic and Subatomic Physics Research
- Astronomy and Astrophysical Research
- Atomic and Molecular Physics
- Earthquake Detection and Analysis
- Ionic liquids properties and applications
- Mathematical Analysis and Transform Methods
- Seismic Waves and Analysis
- Plant Genetic and Mutation Studies
- Calibration and Measurement Techniques
Karlsruhe Institute of Technology
2019-2024
University of Freiburg
2019-2021
Ohio Department of Natural Resources
2020
TU Bergakademie Freiberg
2019
Western University
1998-2014
Ludwig-Maximilians-Universität München
2006
Defence Research and Development Canada
1957
The S transform, which is introduced in the present correspondence, an extension of ideas continuous wavelet transform (CWT) and based on a moving scalable localizing Gaussian window. It shown to have some desirable characteristics that are absent transform. unique it provides frequency-dependent resolution while maintaining direct relationship with Fourier spectrum. These advantages due fact modulating sinusoids fixed respect time axis, whereas window dilates translates.
SCISAT‐1, also known as the Atmospheric Chemistry Experiment (ACE), is a Canadian satellite mission for remote sensing of Earth's atmosphere. It was launched into low Earth circular orbit (altitude 650 km, inclination 74°) on 12 Aug. 2003. The primary ACE instrument high spectral resolution (0.02 cm −1 ) Fourier Transform Spectrometer (FTS) operating from 2.2 to 13.3 μm (750–4400 ). features dual spectrophotometer MAESTRO with wavelength coverage 285–1030 nm and 1–2 nm. A pair filtered CMOS...
The WIND imaging interferometer (WINDII) was launched on the Upper Atmosphere Research Satellite (UARS) September 12, 1991. This joint project, sponsored by Canadian Space Agency and French Centre National d'Etudes Spatiales, in collaboration with NASA, has responsibility of measuring global wind pattern at top altitude range covered UARS. WINDII measures wind, temperature, emission rate over 80 to 300 km using visible region airglow from these altitudes as a target employing optical Doppler...
In recent times it has become increasingly clear that releases of trace gases from human activity have a potential for causing change in the upper atmosphere. However, our knowledge systematic changes and trends temperature mesosphere lower thermosphere is relatively limited compared to Earth's atmosphere, not much effort been made synthesize these results so far. this article, comprehensive review long‐term region 50 100 km on basis available up‐to‐date understanding measurements model...
The Wind Imaging Interferometer (WINDII) was launched on the NASA's Upper Atmosphere Research Satellite 12 September 1991 and operated until 2003. Its role in mission to measure vector winds Earth's atmosphere from 80 110 km, but its measurements extended nearly 300 km. approach employed Doppler shifts a suite of visible region airglow lines emitted over this altitude range. These included atomic oxygen O( 1 S) D) lines, as well OH Meinel (8,3) O 2 Atmospheric (0,0) bands. instrument...
During the ALOHA‐93 campaign coincident imaging and interferometric measurements of near infrared visible wavelength nightglow emissions were made from Haleakala Crater, Maui. On 10 October, 1993 a most unusual wave event was observed. This disturbance appeared as sharp “front” followed by several conspicuous crests which progressed rapidly through imager's field view (180°). As front passed overhead interferometer detected sudden jump in both OH intensity (>50%) its rotational...
Hydroxyl and oxygen greenline nightglow observations from the Wind Imaging Interferometer (WINDII) are used to examine local time–latitude variation of atomic in mesopause region. Individual hydroxyl emission profiles over 5 years data converted mixing ratio (or concentration) then binned into times, latitudes, seasons. The two derived each combined a single profile that spans significant portion region (80 115 km). A technique developed earlier addresses altitude variability is used. This...
Relative populations of the vibrational levels ν = 2 to 9 (except 5) hydroxyl radical have been determined from observations Δν and 3 sequences vibration–rotation bands in infrared night airglow spectrum using a Fourier transform spectrometer. The observed line intensities were corrected for water vapour absorption new technique. results indicate population upper which is as much factor two lower than that found other studies. distribution not consistent with atomic hydrogen ozone reaction...
Abstract. OH(6–2) Q1/P1 and R1/P1 airglow emission intensity ratios, for rotational states up to j' = 4.5, are measured be lower than implied by transition probabilities published various authors including Mies, Langhoff et al. Turnbull Lowe. Experimentally determined relative values of transitions yield temperatures 2 K al., 7 Mies 13 Lowe.Key words: Atmospheric composition structure (airglow aurora; pressure, density temperature)
WINDII, the Wind Imaging Interferometer on Upper Atmosphere Research Satellite, began atmospheric observations September 28, 1991 and since then has been collecting data winds, temperatures emissions rates from atomic, molecular ionized oxygen species, as well hydroxyl. The validation of winds is not yet complete, scientific interpretation barely begun, but dominant characteristic these so far remarkable structure in emission rate excited species produced by recombination atomic oxygen....
The WINDII instrument onboard the UARS satellite made many thousands of measurements apparent brightness hydroxyl airglow as a function tangent height during night. were mainly at latitudes between 42°S and 42°N. Most profiles volume emission rate indicate simple layer with peak 85 90 km. However, from 5 to 25% measured have more complex structure for profile, most frequently two peaks separated by 4 6 horizontal extent varies 200 several thousand kilometers, duration may be long 1½ hours....
Images of the variations OH nightglow intensities have been recorded by a three‐station network scanning radiometers in southwestern Ontario during period from May until September 1998. Each radiometer performs 16 point raster scan night sky every minute, turning itself on and off when solar depression angle is <6°. The horizontal phase velocity, wavelength, frequency internal gravity waves are derived intensity measurements using joint time‐frequency analysis techniques, including S...
Abstract. The OH(6-2) band was monitored during 1990 at Davis, Antarctica (68.6°S, 78.0°E) using a Czerny-Turner scanning spectrometer. Spectra obtained with 0.15-nm bandwidth and wavelength steps of 0.005 nm have been recorded in an attempt to isolate auroral features. This has enabled detailed study weak features the region λ837.5–855.5 nm. These can contribute apparent intensity P-branch lines background. Their presence is allowed for our calculation rotational temperature, but P1(3) line...
The use of satellite measurements the hydroxyl airglow volume emission rate profile to infer atomic oxygen mesopause region is complicated by uncertainties as collision de‐excitation mechanism and vibration transition probabilities that are needed for analysis. In this paper, we demonstrate shape derived profiles is, a large extent, independent choice these factors. We data from two nights observation Wind Imaging Interferometer (WINDII) instrument onboard Upper Atmospheric Research...
On October 9, 1993, observations were made from the National Center for Atmospheric Research Electra aircraft during a flight Maui, Hawaii, toward low‐pressure system NW of island, 7 hours in total. The leading edge (wall) bright airglow layer was observed 900 km Maui at 0815 UT, which traveling 75 m s −1 SE, reaching Haleakala, about 3.25 later [see Swenson and Espy , 1995]. An intriguing feature associated with event large increase mesospheric Na column density wall (∼180%). enhancement...
Observations made during the Airborne Lidar and of Hawaiian Airglow (ALOHA‐93) campaign October 1993 revealed presence persistent large perturbations temperature density in 80 to 100 km mesopause region. These perturbations, seen both by passive airglow active lidar techniques, were identified as due diurnal semidiurnal tides. results compared with predictions thermosphere/ionosphere/mesosphere electrodynamics general circulation model (TIME‐GCM). This was recently tuned agree observations...
view Abstract Citations (40) References (33) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Search for HeH + in NGC 7027 Moorhead, J. M. ; Lowe, R. P. Maillard, -P. Wehlau, W. H. Bernath, F. The 3.3-micron spectrum of the planetary nebula was searched R(0) line fundamental vibration-rotation band molecular ion HeH(+) without detecting it. upper limit detection is 3.7 x 10 to -14th ergs/sq cm per sec, an improvement excess 100 over previous published...