A Model of Hourly Variations of the Near‐Earth Magnetic Field Generated in the Inner Magnetosphere and Its Induced Counterpart

Fillion, M.; Chulliat, A.; Alken, P.; Kruglyakov, M.; Kuvshinov, A.

doi:10.1029/2023JA031913

Advanced Search

Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

Advanced Search
Custom Query

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields

Language:

Dates

Publication Date Range:

to

Document Data

Title:

Document Type:

Library

Collection:

Series:

People

Author:

Clear All

Query Builder

Query box

Clear All

For additional assistance using the Custom Query please check out our Help Page

i

A Model of Hourly Variations of the Near‐Earth Magnetic Field Generated in the Inner Magnetosphere and Its Induced Counterpart

2023
By Fillion, M. ; Chulliat, A. ; Alken, P. ; ...
Source: Journal of Geophysical Research: Space Physics, 128(12)

[PDF-3.81 MB]

Details You May Also Like

Details:

Journal Title:

Journal of Geophysical Research: Space Physics
Personal Author:

Fillion, M. ; Chulliat, A. ; Alken, P. ; Kruglyakov, M. ; Kuvshinov, A.

Fillion, M. ; Chulliat, A. ; Alken, P. ; Kruglyakov, M. ; Kuvshinov, A. Less -
NOAA Program & Office:

NESDIS (National Environmental Satellite, Data, and Information Service) ; OAR (Oceanic and Atmospheric Research) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; NCEI (National Centers for Environmental Information)

NESDIS (National Environmental Satellite, Data, and Information Service) ; OAR (Oceanic and Atmospheric Research) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; NCEI (National Centers for Environmental Information) Less -
Description:

We present a new model of the near‐Earth magnetospheric field produced by electric currents in the inner magnetosphere and the associated induced magnetic field. The model is designed to track hourly variations of these fields and accounts for their local time asymmetries. It is built by applying spherical harmonic analysis to vector measurements from the ground observatory network at low and mid‐latitudes. The primary and induced fields are separated with an approach in the time domain that uses a a priori radially‐symmetric electric conductivity model of the Earth. The model coefficients are computed at one‐hour time steps between 1997 and 2022. This model is shown to be consistent to within a few nT with previously developed indices which track the magnetospheric ring current. It is also validated against data from the Swarm, CHAMP and Øersted satellites. The fit to satellite data is comparable to that of the CHAOS‐7.15 model for geomagnetically quiet times, and improved by up to 20% on some components for geomagnetically moderate and active times. We attribute these differences mostly to a better representation of local time asymmetries, both on average and during individual geomagnetic storms. This model can be used in various applications, such as investigating the properties of the magnetospheric field and its sources and separating the magnetospheric field from the fields of other sources in geomagnetic field modeling.
Keywords:

[+]

Geophysics Space And Planetary Science
Source:

Journal of Geophysical Research: Space Physics, 128(12)
DOI:

https://doi.org/10.1029/2023JA031913
ISSN:

2169-9380;2169-9402;
Format:

PDF
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
Funding:

Grant no. NA17OAR4320101 ; Grant no. NA22OAR4320151

Grant no. NA17OAR4320101 ; Grant no. NA22OAR4320151 Less -
Rights Information:

Other
Compliance:

Submitted
Main Document Checksum:

[+]

urn:sha256:657d8c406c452862a99904c02cf4e665256d1b4484f98078d473e2cd7cbb59b5
Download URL:

https://repository.library.noaa.gov/view/noaa/56239/noaa_56239_DS1.pdf
File Type:

No Additional Files

More +

A Model of Hourly Variations of the Near‐Earth Magnetic Field Generated in the Inner Magnetosphere and Its Induced Counterpart

Details:

Supporting Files

You May Also Like