SA022
The Ionospheric Valley Region: Ionization from Above, Forcing from Below, and its Importance to Space Weather
Session ID#: 78698
Session Description:
The low and mid-latitude ionospheric valley region extends upward from the daytime E-region electron density peak to the bottom of the F-region, typically between 110 and 200 km. This region has important impacts on the space environment and space weather. At low magnetic latitudes, it is the source region for Spread-F plumes and the region where radars use 150-km echoes to monitor the vertical motions of the atmosphere. Despite this importance, this region remains poorly understood because of a lack of observations and the complexity of the ionization processes. As a result, researchers still do not understand the mechanisms that lead to the plasma irregularities observed by radars, nor do they understand the modulations caused by neutral tides and waves that come from below. This session will gather researchers with expertise in neutral winds, ionospheric dynamics and remote sensing to develop a better understanding of the valley region.
Index Terms:
6929 Ionospheric physics [RADIO SCIENCE]
6969 Remote sensing [RADIO SCIENCE]
7815 Electrostatic structures [SPACE PLASMA PHYSICS]
7944 Ionospheric effects on radio waves [SPACE WEATHER]
Primary Convener: Meers M Oppenheim, Boston University, Center for Space Physics, Boston, MA, United States
Conveners: Jorge Luis Chau, Leibniz Institute of Atmospheric Physics, Radar Remote Sensing, Kühlungsborn, Germany and Dr Claudia Stolle, GFZ German Research Centre for Geosciences, Potsdam, Germany
Primary Liaison: Nicholas M Pedatella, National Center for Atmospheric Research, Boulder, CO, United States
Height variation of gaps in 150-km echoes and Whole Atmosphere Community Climate Model electron densities (489998)
Gerald A Lehmacher1, Haonan Wu1, Erhan Kudeki2, Pablo Reyes3, David L Hysell4 and Marco A Milla2, (1)Clemson University, Clemson, SC, United States, (2)University of Illinois at Urbana Champaign, Electrical and Computer Engineering, Urbana, IL, United States, (3)SRI International Menlo Park, Menlo Park, CA, United States, (4)Cornell University, Ithaca, NY, United States
Seasonal variation and solar activity dependence of two distinct types of 150-km echoes from JULIA observations (503795)
Gabrielle Guttormsen, Boston University, Boston, MA, United States, Meers M Oppenheim, Boston University, Center for Space Physics, Boston, MA, United States and Marco A Milla, University of Illinois at Urbana Champaign, Electrical and Computer Engineering, Urbana, IL, United States
Lower E region second-order statistics and wind-field measurements at low latitudes and their connection to equatorial valley radar echoes (505345)
Jorge Luis Chau1, Juha Vierinen2, Brian Joseph Harding3, Juan Miguel Urco1, Marco A Milla4, Ralph Latteck1, Juan Federico Conte1 and J. Salvador5, (1)Leibniz Institute of Atmospheric Physics, Radar Remote Sensing, Kühlungsborn, Germany, (2)Univrsity of Tromsø, Tromso, Norway, (3)University of California, Berkeley, Space Sciences Laboratory, Berkeley, CA, United States, (4)Instituto Geofísico del Perú, Jicamarca Radio Observatory, Lima, Peru, (5)CEILAP, CITEDEF, CONICET, Buenos Aires, Argentina
Solar Flare Effects on 150-km Echoes Observed Over Jicamarca: WACCM-X Simulations (518628)
Nicholas M Pedatella, National Center for Atmospheric Research, Boulder, CO, United States, Jorge Luis Chau, Leibniz Institute of Atmospheric Physics, Radar Remote Sensing, Kühlungsborn, Germany, Juha Vierinen, Univrsity of Tromsø, Tromso, Norway, Liying Qian, NCAR, HAO, Boulder, CO, United States, Pablo M Reyes, SRI International Menlo Park, Menlo Park, CA, United States, Erhan Kudeki, University of Illinois at Urbana Champaign, Electrical and Computer Engineering, Urbana, IL, United States, Gerald A Lehmacher, Clemson University, Clemson, SC, United States and Meers M Oppenheim, Boston University, Center for Space Physics, Boston, MA, United States
VIPIR and 50 MHz radar observations of gravity wave signatures in 150-km echoes at Jicamarca (529265)
Pablo Reyes1, Erhan Kudeki2, Gerald A Lehmacher3, Marco A Milla2 and Jorge Luis Chau4, (1)SRI International Menlo Park, Menlo Park, CA, United States, (2)University of Illinois at Urbana Champaign, Electrical and Computer Engineering, Urbana, IL, United States, (3)Clemson University, Clemson, SC, United States, (4)Leibniz Institute of Atmospheric Physics, Radar Remote Sensing, Kühlungsborn, Germany
Occurrence of metal ions in the descending layers over Arecibo (530903)
Shikha Raizada1, Mike Sulzer1, John A Smith2, Phil Perillat1, John D Mathews3 and Nestor Aponte1, (1)Arecibo Observatory, Arecibo, PR, United States, (2)NASA Langley Research Ceneter, Hampton, CO, United States, (3)Pennsylvania State Univ, University Park, PA, United States
Kinetic theory for photoelectron driven instabilities: Applications to 150 km echoes (543919)
William Longley1, Meers M Oppenheim2, Yakov S Dimant2 and Nicholas M Pedatella3, (1)Rice University, Department of Physics and Astronomy, Houston, TX, United States, (2)Boston University, Center for Space Physics, Boston, MA, United States, (3)National Center for Atmospheric Research, Boulder, CO, United States
Equatorial valley region incoherent and coherent scatter measurements at Jicamarca (Invited) (552367)
Erhan Kudeki1, Pablo Reyes2, Marco A Milla1,3 and Lin Le1, (1)University of Illinois at Urbana Champaign, Electrical and Computer Engineering, Urbana, IL, United States, (2)SRI International Menlo Park, Menlo Park, CA, United States, (3)Instituto Geofísico del Perú, Jicamarca Radio Observatory, Lima, Peru
Kinetic Simulations of Photoelectron Driven Instabilities Applied to 150 Km Echoes with Improved Collision Models (552372)
Meers M Oppenheim1, Yakov S Dimant1, William James Longley2 and Glenn Sugar3, (1)Boston University, Center for Space Physics, Boston, MA, United States, (2)Rice Univ, Houston, TX, United States, (3)Stanford University, Stanford, CA, United States
Investigation of valley region composition and dynamics using GOLD satellite mission: A data assimilation approach (584759)
Pallamraju Duggirala, Physical Research Laboratory, Ahmedabad, India, Fazlul Islam Laskar, University of Colorado at Boulder, Laboratory for Atmospheric and Space Physics, Boulder, CO, United States, Nicholas M Pedatella, National Center for Atmospheric Research, Boulder, CO, United States, Mihail Codrescu, SWPC/NOAA, Boulder, CO, United States and Richard Eastes, University of Colorado, Laboratory for Atmospheric and Space Physics, Boulder, CO, United States
