The equatorial and low-latitude ionosphere within the context of global modeling |
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| Authors: | Michael Mendillo Joei Wroten Raymond Roble Henry Rishbeth |
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| Institution: | 1. Center for Space Physics, Boston University, 725 Commonwealth Avenue, Boston, MA 02215, USA;2. High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO 80307, USA;3. School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, UK;1. Center for Atmospheric Research, National Space Research and Development Agency, Nigeria;2. Indian Institute of Geomagnetism, Navi Mumbai, India;3. Department of Physics, University of Port Harcourt, Nigeria;4. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China;5. Abdus Salam International Center for Theoretical Physics, Trieste, Italy;6. Department of Mathematics and Science, University of Rwanda, Kayonza, Rwanda;1. Hematology and Medical Oncology Fellowship Program, The University of Texas MD Anderson Cancer Center, Houston, TX, USA;2. Department of Diagnostic Radiology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA;3. Internal Medicine Residency Program, The University of Texas Medical School at Houston, Houston, TX, USA;4. Division of Quantitative Sciences, The University of Texas MD Anderson Cancer Center, Houston, TX, USA;5. Clinical Pharmacy Programs, The University of Texas MD Anderson Cancer Center, Houston, TX, USA;6. Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA;7. Essential Health Cancer Center, Duluth, MN, USA;1. Department of Industrial Physics, Landmark University, P.M.B. 1001, Omu-Aran, Kwara State, Nigeria;2. Department of Physics, University of Ilorin, Ilorin, Nigeria;3. Lowell Digisonde International, LLC, 175 Cabot Street, Suite 200, Lowell, MA 01854, USA;1. Istituto Nazionale di Geofisica e Vulcanologia, 00143 Roma, Italy;2. Università di Bologna, Alma Mater Studiorum, 40126 Bologna, Italy;1. Frederick Research Center, Nicosia, Cyprus;2. Department of Physics, University of Crete, Heraklion, Crete, Greece;3. Institute of Space and Atmospheric Studies, University of Saskatchewan, Saskatoon, Canada;1. Dipartimento di Fisica, Università di Roma “La Sapienza”, 00185 Rome, Italy;2. Istituto Nazionale di Geofisica e Vulcanologia, 00143 Rome, Italy |
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| Abstract: | The thermosphere–ionosphere–mesosphere-electrodynamics coupled model TIME-GCM, coupled to NCEP lower atmosphere data, is used to simulate the noontime ionospheric peak electron density NmF2 at low latitudes for year 2002. Model output are compared with observations a three ionosonde stations: Jicamarca, Ascension Island and Darwin, stations at geomagnetic latitudes of 3°S, 10°S and 22°S, respectively. The modeled electron density at the peak of the F2-layer (NmF2) matches the general trend of the data fairly well at noon throughout the year. The shapes of the diurnal curves of NmF2 vs. local time are not well produced in the model, and particularly so at the two stations away from the geomagnetic equator. At all sites the day-to-day variability of NmF2, assessed using the percent standard deviation about the monthly mean, is about twice the modeled variability. Possible sources of this shortfall in the model may be due to the under-representation of coupling from below and/or from auroral sources. |
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