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Found 16 entries in the Bibliography.

Showing entries from 1 through 16

2021

Auroral ionospheric E region parameters obtained from satellite- based far-ultraviolet and ground-based ionosonde observations – effects of proton precipitation

\textlessp\textgreater\textlessstrong class="journal-contentHeaderColor"\textgreaterAbstract.\textless/strong\textgreater Coincident auroral far-ultraviolet (FUV) and ground-based ionosonde observations are compared for the purpose of determining whether auroral FUV remote sensing algorithms that assume pure electron precipitation are biased in the presence of proton precipitation. Auroral particle transport and optical emission models, such as the Boltzmann 3-Constituent (B3C) model, predict that maximum E region electron density (NmE) values derived from auroral Lyman–Birge–Hopfield (LBH) emissions, assuming electron precipitation, will be biased by up to \textlessspan class="inline-formula"\textgreater∼20\textless/span\textgreater \% (high) for pure proton aurora, while comparisons between LBH radiances and radiances derived from in situ particle flux observations (i.e., Knight et al., 2008, 2012) indicate that the bias associated with proton aurora should be much larger. Surprisingly, in the comparisons with ionosonde observations described here, no bias associated with proton aurora is found in FUV-derived auroral NmE, which means that auroral FUV remote sensing methods for NmE are more accurate in the presence of proton precipitation than was suggested in the aforementioned earlier works. Possible explanations for the discrepancy with the earlier results are discussed.\textless/p\textgreater

Knight, Harold;

Published by: Annales Geophysicae Published on: jan

YEAR: 2021 DOI: 10.5194/angeo-39-105-2021

Auroral ionospheric E region parameters obtained from satellite-based far-ultraviolet and ground-based ionosonde observations—effects of proton precipitation

At the nadir, there are ∼57.5 pixels per averaging area for GUVI and ∼28.5 for SSUSI. Only 0.030 counts per R per averaging area for GUVI, F16 SSUSI, and F18 SSUSI, respectively.

Knight, Harold;

Published by: Published on:

YEAR: 2021 DOI: 10.5194/angeo-39-105-2021

2018

Auroral Ionospheric E Region Parameters Obtained From Satellite-Based Far Ultraviolet and Ground-Based Ionosonde Observations: Data, Methods, and Comparisons

A large number (~1,000) of coincident auroral far ultraviolet (FUV) and ground-based ionosonde observations are compared. This is the largest study to date of coincident satellite-based FUV and ground-based observations of the auroral E region. FUV radiance values from the NASA Thermosphere, Ionosphere, Mesosphere Energetics and Dynamics Global Ultraviolet Imager and the Defense Meteorological Satellite Program F16 and F18 Special Sensor Ultraviolet Spectrographic Imager are included in the study. A method is described for deriving auroral ionospheric E region maximum electron density (NmE) and height of maximum electron density (hmE) from N₂ Lyman-Birge-Hopfield radiances given in two channels using lookup tables generated with the Boltzmann 3-Constituent (B3C) auroral particle transport and optical emission model. Our rules for scaling (i.e., extracting ionospheric parameters from) ionograms to obtain auroral NmE and hmE are also described. Statistical and visual comparison methods establish statistical consistency and agreement between the two methods for observing auroral NmE, but not auroral hmE. It is expected that auroral nonuniformity will cause the two NmE methods to give inconsistent results, but we have not attempted to quantify this effect in terms of more basic principles, and our results show that the two types of NmE observations are well correlated and statistically symmetrical, meaning that there is no overall bias and no scale-dependent bias.

Knight, H.; Galkin, I.; Reinisch, B.; Zhang, Y.;

Published by: Journal of Geophysical Research: Space Physics Published on: 06/2018

YEAR: 2018 DOI: 10.1029/2017JA024822

Auroral ionospheric E region parameters obtained from satellite-based far ultraviolet and ground-based ionosonde observations: Data, methods, and comparisons

Knight, HK; Galkin, IA; Reinisch, BW; Zhang, Y;

Published by: Journal of Geophysical Research: Space Physics Published on:

YEAR: 2018 DOI: 10.1029/2017JA024822

2013

Determining relative proton and electron auroral LBH emission efficiencies from FUV-ionosonde comparisons-preliminary results

Knight, HK; Galkin, IA; Reinisch, BW; Paxton, L;

Published by: Published on:

YEAR: 2013 DOI: