Global Modeling of the Low and Mid-Latitude Ionospheric D and Lower E Regions and Implications for HF Radiowave Absorption

D.E: Siskind, K.A. Zawdie, F. Sassi, D. Drob, Martin Friedrich

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

We present a global comparison of D and lower E region ionospheric model calculations driven by the Whole Atmosphere Community Climate Model (WACCM) with a selection of electron density profiles made by sounding rockets. WACCM, in turn, is nudged by winds and tem peratures for the years 2008 and 2009 from the Navy Operational Global Atmospheric Prediction System- Advanced Level Physics High Altitude (NOGAPS-ALPHA). This nudging has been shown to greatly improve the representation of key neutral constituents, such as nitric oxide (NO), that are used as inputs to the ionospheric model. Here we show that we improve the comparison between calculated and observed electron densities relative to older studies. At mid-latitudes, both for winter and equinoctal conditions, the model agrees well with the data. At tropical latitudes, our results confirm a previous suggestion that there is a model deficit in the calculated electron density in the lowermost D region. We then apply the calculated electron densities to examine the variation of HF absorption with altitude, latitude, season and from 2008 to 2009. For low latitudes, our results agree with recent studies showing a primary peak absorption in the lower E region with a secondary peak below 75 km. For mid-to-high latitudes, the absorption contains a significant contribution from the middle D region where ioniziation of NO drives the ion chemistry. The difference in mid-to-high latitude absorption from 2008 to 2009 is due to changes in the NO abundance near 80 km which we explain in terms of the changes in the wintertime mesospheric residual circulation.
Spracheenglisch
Seiten115-130
FachzeitschriftSpace Weather
Jahrgang15
Ausgabennummer1
DOIs
StatusVeröffentlicht - 2017

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E region
modeling
nitric oxide
electron density
climate modeling
ionization
physics
winter
prediction

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Global Modeling of the Low and Mid-Latitude Ionospheric D and Lower E Regions and Implications for HF Radiowave Absorption. / Siskind, D.E:; Zawdie, K.A.; Sassi, F.; Drob, D.; Friedrich, Martin.

in: Space Weather, Jahrgang 15, Nr. 1, 2017, S. 115-130.

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

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title = "Global Modeling of the Low and Mid-Latitude Ionospheric D and Lower E Regions and Implications for HF Radiowave Absorption",
abstract = "We compare D and lower E region ionospheric model calculations driven by the WholeAtmosphere Community Climate Model (WACCM) with a selection of electron density profiles made bysounding rockets over the past 50 years. The WACCM model, in turn, is nudged by winds and temperaturesfrom the Navy Operational Global Atmospheric Prediction System-Advanced Level Physics High Altitude(NOGAPS-ALPHA). This nudging has been shown to greatly improve the representation of key neutralconstituents, such as nitric oxide (NO), that are used as inputs to the ionospheric model. We show thatwith this improved representation, we greatly improve the comparison between calculated and observedelectron densities relative to older studies. At midlatitudes, for both winter and equinoctal conditions, themodel agrees well with the data. At tropical latitudes, our results confirm a previous suggestion that there isa model deficit in the calculated electron density in the lowermost D region. We then apply the calculatedelectron densities to examine the variation of HF absorption with altitude, latitude, and season and from2008 to 2009. For low latitudes, our results agree with recent studies showing a primary peak absorptionin the lower E region with a secondary peak below 75 km. For midlatitude to high latitude, the absorptioncontains a significant contribution from the middle D region where ionization of NO drives the ionchemistry. The difference in middle- to high-latitude absorption from 2008 to 2009 is due to changes in theNO abundance near 80 km from changes in the wintertime mesospheric residual circulation.",
author = "D.E: Siskind and K.A. Zawdie and F. Sassi and D. Drob and Martin Friedrich",
year = "2017",
doi = "10.1002/2016SW001546",
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journal = "Space Weather",
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TY - JOUR

T1 - Global Modeling of the Low and Mid-Latitude Ionospheric D and Lower E Regions and Implications for HF Radiowave Absorption

AU - Siskind, D.E:

AU - Zawdie, K.A.

AU - Sassi, F.

AU - Drob, D.

AU - Friedrich, Martin

PY - 2017

Y1 - 2017

N2 - We compare D and lower E region ionospheric model calculations driven by the WholeAtmosphere Community Climate Model (WACCM) with a selection of electron density profiles made bysounding rockets over the past 50 years. The WACCM model, in turn, is nudged by winds and temperaturesfrom the Navy Operational Global Atmospheric Prediction System-Advanced Level Physics High Altitude(NOGAPS-ALPHA). This nudging has been shown to greatly improve the representation of key neutralconstituents, such as nitric oxide (NO), that are used as inputs to the ionospheric model. We show thatwith this improved representation, we greatly improve the comparison between calculated and observedelectron densities relative to older studies. At midlatitudes, for both winter and equinoctal conditions, themodel agrees well with the data. At tropical latitudes, our results confirm a previous suggestion that there isa model deficit in the calculated electron density in the lowermost D region. We then apply the calculatedelectron densities to examine the variation of HF absorption with altitude, latitude, and season and from2008 to 2009. For low latitudes, our results agree with recent studies showing a primary peak absorptionin the lower E region with a secondary peak below 75 km. For midlatitude to high latitude, the absorptioncontains a significant contribution from the middle D region where ionization of NO drives the ionchemistry. The difference in middle- to high-latitude absorption from 2008 to 2009 is due to changes in theNO abundance near 80 km from changes in the wintertime mesospheric residual circulation.

AB - We compare D and lower E region ionospheric model calculations driven by the WholeAtmosphere Community Climate Model (WACCM) with a selection of electron density profiles made bysounding rockets over the past 50 years. The WACCM model, in turn, is nudged by winds and temperaturesfrom the Navy Operational Global Atmospheric Prediction System-Advanced Level Physics High Altitude(NOGAPS-ALPHA). This nudging has been shown to greatly improve the representation of key neutralconstituents, such as nitric oxide (NO), that are used as inputs to the ionospheric model. We show thatwith this improved representation, we greatly improve the comparison between calculated and observedelectron densities relative to older studies. At midlatitudes, for both winter and equinoctal conditions, themodel agrees well with the data. At tropical latitudes, our results confirm a previous suggestion that there isa model deficit in the calculated electron density in the lowermost D region. We then apply the calculatedelectron densities to examine the variation of HF absorption with altitude, latitude, and season and from2008 to 2009. For low latitudes, our results agree with recent studies showing a primary peak absorptionin the lower E region with a secondary peak below 75 km. For midlatitude to high latitude, the absorptioncontains a significant contribution from the middle D region where ionization of NO drives the ionchemistry. The difference in middle- to high-latitude absorption from 2008 to 2009 is due to changes in theNO abundance near 80 km from changes in the wintertime mesospheric residual circulation.

U2 - 10.1002/2016SW001546

DO - 10.1002/2016SW001546

M3 - Article

VL - 15

SP - 115

EP - 130

JO - Space Weather

T2 - Space Weather

JF - Space Weather

SN - 1542-7390

IS - 1

ER -