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Articles 1 - 2 of 2
Full-Text Articles in Physical Sciences and Mathematics
A Global Mhd Simulation Of An Event With A Quasi-Steady Northward Imf Component, V G. Merkin, J G. Lyon, B J. Anderson, H Korth, C C. Goodrich, K Papadopoulos
A Global Mhd Simulation Of An Event With A Quasi-Steady Northward Imf Component, V G. Merkin, J G. Lyon, B J. Anderson, H Korth, C C. Goodrich, K Papadopoulos
Dartmouth Scholarship
We show results of the Lyon-Fedder-Mobarry (LFM) global MHD simulations of an event previously ex- amined using Iridium spacecraft observations as well as DMSP and IMAGE FUV data. The event is chosen for the steady northward IMF sustained over a three-hour pe- riod during 16 July 2000. The Iridium observations showed very weak or absent Region 2 currents in the ionosphere, which makes the event favorable for global MHD model- ing. Here we are interested in examining the model’s per- formace during weak magnetospheric forcing, in particular, its ability to reproduce gross signatures of the ionospheric currents and convection pattern …
Impact Of Minimum Winter Temperatures On The Population Dynamics Of Dendroctonus Frontalis, J. KhảI TrầN, Tiina Ylioja, Ronald F. Billings, Jacques Régnière, Matthew P. Ayres
Impact Of Minimum Winter Temperatures On The Population Dynamics Of Dendroctonus Frontalis, J. KhảI TrầN, Tiina Ylioja, Ronald F. Billings, Jacques Régnière, Matthew P. Ayres
Dartmouth Scholarship
Predicting population dynamics is a fundamental problem in applied ecology. Temperature is a potential driver of short-term population dynamics, and temperature data are widely available, but we generally lack validated models to predict dynamics based upon temperatures. A generalized approach involves estimating the temperatures experienced by a population, characterizing the demographic consequences of physiological responses to temperature, and testing for predicted effects on abundance. We employed this approach to test whether minimum winter temperatures are a meaningful driver of pestilence from Dendroctonus frontalis (the southern pine beetle) across the southeastern United States. A distance-weighted interpolation model provided good, spatially explicit, …