The role of zonal winds in the production of a pre-reversal enhancement in the vertical ion drift in the low latitude ionosphere

2012 ◽  
Vol 117 (A8) ◽  
pp. n/a-n/a ◽  
Author(s):  
R. A. Heelis ◽  
G. Crowley ◽  
F. Rodrigues ◽  
A. Reynolds ◽  
R. Wilder ◽  
...  
Keyword(s):  
Low Latitude ◽  
Ion Drift ◽  
Zonal Winds ◽  
Low Latitude Ionosphere

scholarly journals Distinct responses of the low-latitude ionosphere to CME and HSSWS: The role of the IMF Bz oscillation frequency

2016 ◽  
Vol 121 (11) ◽  
pp. 11,528-11,548 ◽  
Author(s):  
J. Rodríguez-Zuluaga ◽  
S. M. Radicella ◽  
B. Nava ◽  
C. Amory-Mazaudier ◽  
H. Mora-Páez ◽  
...  
Keyword(s):  
Oscillation Frequency ◽  
Low Latitude ◽  
Low Latitude Ionosphere ◽  
The Imf

VLF/LF (Very Low Frequency/Low Frequency) Reflection Properties of the Low Latitude Ionosphere

1988 ◽  
Author(s):  
Wayne I. Klemetti ◽  
Paul A. Kossey ◽  
John E. Rasmussen ◽  
Maria Sueli Da Silveira Macedo Moura
Keyword(s):  
Low Frequency ◽  
Low Latitude ◽  
Very Low Frequency ◽  
Low Latitude Ionosphere

scholarly journals An investigation of the ionospheric F region near the EIA crest in India using OI 777.4 and 630.0 nm nightglow observations

2018 ◽  
Vol 36 (3) ◽  
pp. 809-823 ◽  
Author(s):  
Navin Parihar ◽  
Sandro Maria Radicella ◽  
Bruno Nava ◽  
Yenca Olivia Migoya-Orue ◽  
Prabhakar Tiwari ◽  
...  
Keyword(s):  
Electron Density ◽  
Gravity Waves ◽  
Satellite Mission ◽  
Low Latitude ◽  
Density Maximum ◽  
Density Profiles ◽  
F Region ◽  
Equatorial Ionization Anomaly ◽  
Low Latitude Ionosphere ◽  
Electron Density Profiles

Abstract. Simultaneous observations of OI 777.4 and OI 630.0 nm nightglow emissions were carried at a low-latitude station, Allahabad (25.5° N, 81.9° E; geomag. lat.  ∼  16.30° N), located near the crest of the Appleton anomaly in India during September–December 2009. This report attempts to study the F region of ionosphere using airglow-derived parameters. Using an empirical approach put forward by Makela et al. (2001), firstly, we propose a novel technique to calibrate OI 777.4 and 630.0 nm emission intensities using Constellation Observing System for Meteorology, Ionosphere, and Climate/Formosa Satellite Mission 3 (COSMIC/FORMOSAT-3) electron density profiles. Next, the electron density maximum (Nm) and its height (hmF2) of the F layer have been derived from the information of two calibrated intensities. Nocturnal variation of Nm showed the signatures of the retreat of the equatorial ionization anomaly (EIA) and the midnight temperature maximum (MTM) phenomenon that are usually observed in the equatorial and low-latitude ionosphere. Signatures of gravity waves with time periods in the range of 0.7–3.0 h were also seen in Nm and hmF2 variations. Sample Nm and hmF2 maps have also been generated to show the usefulness of this technique in studying ionospheric processes.

scholarly journals Middle‐ and low‐latitude ionosphere response to 2015 St. Patrick's Day geomagnetic storm

2016 ◽  
Vol 121 (4) ◽  
pp. 3421-3438 ◽  
Author(s):  
B. Nava ◽  
J. Rodríguez‐Zuluaga ◽  
K. Alazo‐Cuartas ◽  
A. Kashcheyev ◽  
Y. Migoya‐Orué ◽  
...  
Keyword(s):  
Geomagnetic Storm ◽  
Low Latitude ◽  
Low Latitude Ionosphere

Examining and comparing observed and simulated daytime neutral wind and ionospheric drift variations

2021 ◽  
Author(s):  
Astrid Maute ◽  
Brian Harding ◽  
Joanne Wu ◽  
Colin Triplett ◽  
Rodrick Heelis ◽  
...  
Keyword(s):  
Climate Model ◽  
Middle Latitude ◽  
General Context ◽  
Neutral Wind ◽  
Contributing Factors ◽  
Low Latitude ◽  
Large Variability ◽  
Ion Drift ◽  
Plasma Drift ◽  
Ionospheric Drift

<p>The neutral wind dynamo plays an important role in generating low-latitude ionospheric variability and space weather. The characteristic equatorial ionization anomaly is generated by the daytime equatorial upward drift, which has imprinted on it the variation from upward propagating tides and waves. Observations and modeling studies have indicated large variability of the plasma drift on time scales from days to seasons associated with the wind dynamo at low and middle latitudes. The relationship of the ionospheric drift variability to the neutral wind variations is still not fully understood. The Ionospheric Connection explorer (ICON) mission is designed to focus on the low to middle latitude region and measures key parameters, such as the plasma drift and density and neutral temperatures and winds, to address the question of vertical coupling.</p><p>In this presentation, we will focus on the ICON observations and compare to Whole Atmosphere Community Climate Model-Extended (WACCM-X) simulations to examine the daytime low latitude ion drift and neutral wind variations. We investigate the day-to-day and longitudinal variation between concurrent ion drift and neutral wind variations over short time periods to quantify the contribution of the neutral wind in generating the ionospheric drift variations. Employing WACCM-X simulations, we investigate the importance of contributing factors, such as ionospheric conductivities, the geomagnetic main field, magnetosphere-ionosphere coupling, and the neutral wind, in generating the observed ionospheric drift variations. While we focus in this study on field line integrated ionospheric current density due to electric field/drift and neutral wind, we conclude by discussing our results in a more general context.</p>

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