Heelis, Roderick A.
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Roderick Heelis holds the Distinguished Chair in Natural Sciences and Mathematics and is the Director of the William B. Hanson Center for Space Sciences. Dr. Heelis’s research interests focus on understanding the interaction of planetary environments with the Sun. For the Earth this interaction is influenced by the atmosphere and the magnetic field and directly affects the successful operation of space-based communication and navigation systems.
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Recent Submissions
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Temporal Characteristic of the Mesoscale Plasma Flow Perturbations in the High-Latitude Ionosphere
(Amer Geophysical Union, 2019-01-03)Spatial and temporal characteristics of flow perturbations in the high-latitude ionosphere are important considerations for energy deposition from the magnetosphere. In this study, we examine the temporal characteristics ... -
Motions of the Convection Reversal Boundary and Local Plasma in the High-Latitude Ionosphere
We present results from a systematic study of multisatellite samplings from the Defense Meteorological Satellite Program F13, F15, F16, F17, and F18 satellites over the period from 2007 to 2015 that describe the motion of ... -
Plasma Dynamics Associated with Equatorial Ionospheric Irregularities
The Communication/Navigation Outage Forecasting System satellite was operational from 2008, a period of deep solar minimum, to 2015, a period of moderate solar conditions. The behavior of the vertical plasma drift and the ... -
The Ion/Electron Temperature Characteristics of Polar Cap Classical and Hot Patches and their Influence on Ion Upflow
The term of “polar cap hot patch” is a newly identified high-density plasma irregularity at high latitudes, which is associated with high electron temperature and particle precipitation, while a classical polar cap patch ... -
Mesoscale Plasma Convection Perturbations In The High-latitude Ionosphere
An investigation of flow perturbations with spatial scale sizes between 100 and 500 km in the high-latitude ionosphere is presented. These localized flow perturbations are deviations from the large-scale background convection, ... -
Coordinated Satellite Observations of the Very Low Frequency Transmission through the Ionospheric D Layer at Low Latitudes, Using Broadband Radio Emissions from Lightning
Both ray theory and full-wave models of very low frequency transmission through the ionospheric D layer predict that the transmission is greatly suppressed near the geomagnetic equator. We use data from the low-inclination ... -
Effects of Electric Field Methods on Modeling the Midlatitude Ionospheric Electrodynamics and Inner Magnetosphere Dynamics
(Amer Geophysical Union, 2017-05-22)We report a self-consistent electric field coupling between the midlatitude ionospheric electrodynamics and inner magnetosphere dynamics represented in a kinetic ring current model. This implementation in the model features ... -
Daytime Zonal Drifts in the Ionospheric 150km and E Regions Estimated Using Ear Observations
(Amer Geophysical Union, 2017-08-31)Multibeam observations of the 150km echoes made using the Equatorial Atmosphere Radar (EAR), located at Kototabang, Indonesia, provide unique opportunity to study both vertical and zonal ExB plasma drifts in the equatorial ... -
Modeling the Daytime Energy Balance of the Topside Ionosphere at Middle Latitudes
(Amer Geophysical Union, 2018-08-20)Recently reported measurements from the Defense Meteorological Satellite Program (DMSP) indicate that the O⁺ temperature in the topside ionosphere is dependent on the fractional H⁺ density. This finding indicates that the ... -
Duskside Enhancement of Equatorial Zonal Electric Field Response to Convection Electric Fields During the St. Patrick's Day Storm on 17 March 2015
(Blackwell Publishing Ltd, 2016-01-11)The equatorial zonal electric field responses to prompt penetration of eastward convection electric fields (PPEF) were compared at closely spaced longitudinal intervals at dusk to premidnight sectors during the intense ... -
Identifying Equatorial Ionospheric Irregularities using In Situ Ion Drifts
(Copernicus Gesellschaft Mbh, 2014-04-15)Previous climatological investigations of ionospheric irregularity occurrence in the equatorial ionosphere have utilized in situ measurements of plasma density to identify the presence of an irregularity. Here we use the ... -
Topside Equatorial Zonal Ion Velocities Measured by C/NOFS During Rising Solar Activity
(Copernicus Gesellschaft Mbh, 2014-02-04)The Ion Velocity Meter (IVM), a part of the Coupled Ion Neutral Dynamic Investigation (CINDI) instrument package on the Communication/Navigation Outage Forecast System (C/NOFS) spacecraft, has made over 5 yr of in situ ... -
Response of Low-Latitude Ionosphere to Medium-Term Changes of Solar and Geomagnetic Activity
(2012-08-28)The paper presents the medium-term quasi periodic (∼9-27 day) response of middle and low-latitude ionosphere to solar F10.7) and geomagnetic (Kp-index) forcing. The ionospheric response is examined by wavelet analysis of ... -
Changes in Thermospheric Temperature Induced by High-Speed Solar Wind Streams
(American Geophysical Union, 2012-12-08)During high-speed stream (HSS) events the solar wind speed increases, and the cross polar cap potential increases, leading to increased Joule heating at high latitudes. The heat input at high latitudes heats the polar ...
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