Results 41 to 50 of about 406,860 (186)
Re-defining the Empirical ZZ Ceti Instability Strip [PDF]
, 2004 We use the new ZZ Ceti stars (hydrogen atmosphere white dwarf variables; DAVs) discovered within the Sloan Digital Sky Survey (Mukadam et al. 2004) to re-define the empirical ZZ Ceti instability strip.
A. F. M. Costa +8 more
core +2 more sources
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2023 As an essential vegetation biophysical trait that determines the plant's structure and photosynthetic capacity, characterizing of leaf area index (LAI) is important for vegetation growth and health monitoring.
Yuanheng Sun, Binyu Wang, Zhaoxu Zhang
doaj +1 more source
Hybrid gamma Doradus/delta Scuti Stars: Comparison Between Observations and Theory [PDF]
, 2009 Gamma Doradus are F-type stars pulsating with high order g-modes. Their instability strip (IS) overlaps the red edge of the delta Scuti one. This observation has led to search for objects in this region of the HR diagram showing p and g-modes ...
Bouabid, M-P +6 more
core +1 more source
The vegetation red edge spectroscopic feature as a surface biomarker [PDF]
, 2005 Astrophysics of Life conference proceedings, STScI May 2002, 9 ...
Seager, S., Ford, E. B.
openaire +2 more sources
The Vegetation Red Edge Biosignature Through Time on Earth and Exoplanets [PDF]
Astrobiology, 2018 The high reflection of land vegetation in the near-infrared, the vegetation red edge (VRE), is often cited as a spectral biosignature for surface vegetation on exoplanets. The VRE is only a few percent change in reflectivity for a disk-integrated observation of present-day Earth. Here we show that the strength of Earth's VRE has increased over the past
O'Malley-James, Jack T. +1 more
openaire +3 more sources
Observational Proof of the ZZ Ceti Red Edge [PDF]
International Astronomical Union Colloquium, 2000 With a time-series CCD photometry survey, we have demonstrated clearly that the observed red edge for the ZZ Ceti stars instability strip at 11,000 K is not an observational selection effect. Previous surveys for variability among hydrogen atmosphere white dwarfs at around 11,000 K have been carried out using high speed photometry which suffers from ...
A. Kanaan +3 more
openaire +1 more source
Vegetation's Red Edge: A Possible Spectroscopic Biosignature of Extraterrestrial Plants [PDF]
Astrobiology, 2005 19 pages, 6 figures, to appear in ...
Seager, Sara +3 more
openaire +3 more sources
Grass Chlorophyll and the Reflectance Red Edge
International Journal of Remote Sensing, 1996 The point of maximum slope in the reflectance spectra of leaves occurs around 690-740nm and is termed the 'red edge'. Strong correlations have been found between the red edge of leaves and the chlorophyll concentration of those leaves. Imaging spectrometers can record the red edge of canopies and strong correlations have been observed between
Pınar, A., Curran, P. J.
openaire +2 more sources
Multi-Crop Green LAI Estimation with a New Simple Sentinel-2 LAI Index (SeLI)
Sensors, 2019 The spatial quantification of green leaf area index (LAIgreen), the total green photosynthetically active leaf area per ground area, is a crucial biophysical variable for agroecosystem monitoring.
Nieves Pasqualotto +4 more
doaj +1 more source
Remote Sensing, 2020 Nondestructive and accurate estimating of the forage nitrogen–phosphorus (N:P) ratio is conducive to the real-time diagnosis of nutrient limitation and the formulation of a management scheme during the growth and development of forage.
Jinlong Gao +7 more
doaj +1 more source