What question did this study set out to answer?

To describe the standardized data processing technique used by the SuperMAG initiative to harmonize ground-based magnetic field perturbations across more than 300 global magnetometers.

August 2, 2012Journal of Geophysical Research Atmospheres

The SuperMAG data processing technique

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Authors

JGJ. W. Gjerloev

Discussion

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Overview

Methodological study demonstrates automated baseline removal across global magnetometers, suggesting continuous presence of a weak asymmetric ring current.

Key Points

To describe the standardized data processing technique used by the SuperMAG initiative to harmonize ground-based magnetic field perturbations across more than 300 global magnetometers.
Rotated magnetic observations into a local magnetic coordinate system using a time-dependent declination angle that accounts for main-field shifts and seasonal temperature variations.
Extracted baselines directly from magnetometer time series using a three-step method consisting of a daily baseline, a yearly trend, and a residual offset without relying on designated quiet days.
The residual offset for north (N) and vertical (Z) components exhibited a distinct latitudinal dependence, while the east (E) component remained independent of latitude.
Latitudinal variation in the residual offset indicates that a weak, likely asymmetric ring current persists even during officially designated quiet days.
For 1-minute resolution magnetosphere-ionosphere research, data quality showed no functional difference between standard observatories and variometers.

Cite This Study

J. W. Gjerloev (2012) studied this question.

synapsesocial.com/papers/69da8d5ca6045d71bfa3d064 https://doi.org/10.1029/2012ja017683

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August 2, 2012Journal of Geophysical Research Atmospheres

The SuperMAG data processing technique

View Full Paper

Ask AI

Bookmark

Authors

JGJ. W. Gjerloev

Discussion

Member takes

Overview

Methodological study demonstrates automated baseline removal across global magnetometers, suggesting continuous presence of a weak asymmetric ring current.

Key Points

To describe the standardized data processing technique used by the SuperMAG initiative to harmonize ground-based magnetic field perturbations across more than 300 global magnetometers.
Rotated magnetic observations into a local magnetic coordinate system using a time-dependent declination angle that accounts for main-field shifts and seasonal temperature variations.
Extracted baselines directly from magnetometer time series using a three-step method consisting of a daily baseline, a yearly trend, and a residual offset without relying on designated quiet days.
The residual offset for north (N) and vertical (Z) components exhibited a distinct latitudinal dependence, while the east (E) component remained independent of latitude.
Latitudinal variation in the residual offset indicates that a weak, likely asymmetric ring current persists even during officially designated quiet days.
For 1-minute resolution magnetosphere-ionosphere research, data quality showed no functional difference between standard observatories and variometers.

Cite This Study

J. W. Gjerloev (2012) studied this question.

synapsesocial.com/papers/69da8d5ca6045d71bfa3d064 https://doi.org/10.1029/2012ja017683

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