What question did this study set out to answer?

This research aims to analyze the factors influencing the Equatorial Ionization Anomaly's morphology and shifts during the December solstice in Southeast Asia.

August 3, 2026Space WeatherOpen Access

Quantitative Assessment of Geographic Control of December Solstice EIA Crest Shifts Over Southeast Asia Under Low Solar Activity

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Authors

LHLinfeng Huang JWJingsong Wang TMTian Mao

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Overview

Quantitative assessment shows geographic control significantly affects EIA morphology under low solar activity.

Key Points

This research aims to analyze the factors influencing the Equatorial Ionization Anomaly's morphology and shifts during the December solstice in Southeast Asia.
Used a 27-year dataset of total electron content and F2-layer peak electron density from 1998 to 2024 under geomagnetically quiet conditions.
Extracted crest parameters using dual-Gaussian fitting method and decomposed variance through multiple linear regression.
Evaluated the contributions of geographic control and solar activity to EIA displacement.
Southern EIA crests shifted 9.0° southward for TEC and 7.1° for NmF2 from June to December, showing larger shifts compared to northern crests.
Geographic control explained 98%-99% of variance in southern crest displacement under low solar activity conditions.
Adjusted R² values indicate 52%-67% of total variance remains unexplained, pointing to other influencing factors.

Cite This Study

Huang et al. (2026) studied this question.

synapsesocial.com/papers/6a70407775942ff7265e5914 https://doi.org/10.1029/2026sw004936

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August 3, 2026Space WeatherOpen Access

Quantitative Assessment of Geographic Control of December Solstice EIA Crest Shifts Over Southeast Asia Under Low Solar Activity

View Full Paper

Ask AI

Bookmark

Authors

LHLinfeng Huang JWJingsong Wang TMTian Mao

Discussion

Member takes

Overview

Quantitative assessment shows geographic control significantly affects EIA morphology under low solar activity.

Key Points

This research aims to analyze the factors influencing the Equatorial Ionization Anomaly's morphology and shifts during the December solstice in Southeast Asia.
Used a 27-year dataset of total electron content and F2-layer peak electron density from 1998 to 2024 under geomagnetically quiet conditions.
Extracted crest parameters using dual-Gaussian fitting method and decomposed variance through multiple linear regression.
Evaluated the contributions of geographic control and solar activity to EIA displacement.
Southern EIA crests shifted 9.0° southward for TEC and 7.1° for NmF2 from June to December, showing larger shifts compared to northern crests.
Geographic control explained 98%-99% of variance in southern crest displacement under low solar activity conditions.
Adjusted R² values indicate 52%-67% of total variance remains unexplained, pointing to other influencing factors.

Cite This Study

Huang et al. (2026) studied this question.

synapsesocial.com/papers/6a70407775942ff7265e5914 https://doi.org/10.1029/2026sw004936

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