A Study of Magnetic Storm Current Systems by the Application of Wavelet Analysis to Ground-Based Magnetograms

Abstract

Ground-based magnetograms are used to measure the intensity of magnetic storms, yet the relative contributions of the current systems involved have been debated for decades. Wavelet analysis is a technique to analyze signals with complex content and is well suited to the analysis of time-series data. I applied wavelet analysis to ground magnetograms to extract information about magnetic storms current systems. The analysis showed three components at low- and mid-latitudes: 3-6 hours, 12-25 hours, and >30 hours, with each most likely associated with different current systems. Wavelet analysis also enabled the separation of directly driven and unloading components in high- latitude magnetic data. This allowed a comparison of low- and high-latitude substorm measurements to calculate the confignration of the substorm current wedge. Reasonable wedge configurations were found that matched the magnetic measurements. (135 pages)

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Document Details

Document Type
Technical Report
Publication Date
Sep 05, 2002
Accession Number
ADA408141

Entities

People

  • William B. Cade Iii

Organizations

  • Utah State University

Tags

Communities of Interest

  • Advanced Electronics
  • Space

DTIC Thesaurus Topics

  • Air Force
  • Computational Science
  • Convection
  • Corpuscular Radiation
  • Detection
  • Electric Current
  • Fourier Analysis
  • Geomagnetism
  • Geometry
  • Ground Based
  • High Latitudes
  • Magnetic Disturbances
  • Magnetic Fields
  • Magnetic Properties
  • Magnetic Storms
  • Measurement
  • Three Dimensional

Readers

  • Computational Modeling and Simulation
  • Image Processing and Computer Vision.
  • Space/Atmospheric Physics.