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Your search keyword '"Jansma, T"' showing total 4 results
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4 results on '"Jansma, T"'

1. Ultrafast Magnetoelastic Probing of Surface Acoustic Transients

Author

Janušonis, J., Chang, C. L., Jansma, T., Gatilova, A., Lomonosov, A. M., Shalagatskyi, V., Vlasov, V. S., Temnov, V. V., and Tobey, R. I.

Subjects
Condensed Matter - Materials Science
Abstract

We generate in-plane magnetoelastic waves in nickel films using the all-optical transient grating technique. When performed on amorphous glass substrates, two dominant magnetoelastic excitations can be resonantly driven by the underlying elastic distortions, the Rayleigh Surface Acoustic Wave and the Surface Skimming Longitudinal Wave. An applied field, oriented in the sample plane, selectively tunes the coupling between magnetic precession and one of the elastic waves, thus demonstrating selective excitation of coexisting, large amplitude magnetoelastic waves. Analytical calculations based on the Green's function approach corroborate the generation of the non-equilibrium surface acoustic transients.

Published
2016
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4. A global long-term daily reanalysis of reference evapotranspiration for drought and food-security monitoring.

Author

Hobbins M, Jansma T, Sarmiento DP, McNally A, Magadzire T, Jayanthi H, Turner W, Hoell A, Husak G, Senay G, Boiko O, Budde M, Mogane P, and Dewes CF

Subjects
Agriculture, Climate Change, Plant Transpiration, Crops, Agricultural, Droughts
Abstract

NOAA has developed a global reference evapotranspiration (ET 0 ) reanalysis using the UN Food and Agriculture Organization formulation (FAO-56) of the Penman-Monteith equation forced by MERRA phase 2 (MERRA2) meteorological and radiative drivers. The NOAA ET 0 reanalysis is provided daily from January 1, 1980 to the near-present at a resolution of 0.5° latitude × 0.625° longitude. The reanalysis is verified against station data across southern Africa, a region presenting both significant challenges regarding hydroclimatic variability and observational quantity and quality and significant potential benefits to food-insecure populations. These data are generated from observations from the Southern African Science Service Centre for Climate Change and Adaptive Land Management (SASSCAL) network. We further verified globally against spatially distributed ET 0 derived from two reanalyses-the Global Data Assimilation System (GDAS) and Princeton Global Forcing (PGF)-and these verifications produced similar results, yet demonstrated wide regional and seasonal differences. We also present cases that verify the operational applicability of the reanalysis in long-established drought, famine, crop- and pastoral-stress metrics, and in predictability assessments of drought forecasts., (© 2023. The Author(s).)

Published
2023
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