How to address the accuracy of empirical magnetic field models?

TI Pulkkinen*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Abstract

Empirical magnetic field models are compared with high-altitude magnetic field measurements and results from an MHD simulation. Comparison of the T96 model and observations from GOES-8 and GOES-9 shows that if the observed solar wind and IMF parameters are used to compute the model field, the model field is more stretched than the observed field. On the other hand, if measurements made by one spacecraft are used to find the model parameters that give a best-fit field at that location, the RMS error can be reduced also at the other spacecraft four hours away in local time. Comparison of T96 model and MHD simulation results shows that the empirical models have a thinner current sheet than the MHD simulation, but that the lobe field values are quite similar to each other. Furthermore, a comparison of an event-oriented, modified T89 model and MHD simulation by Pulkkinen et al. [2000] reveals that if the empirical model is constructed by fitting to in-situ measurements, the resulting model is very similar to the MHD simulation magnetic field. These results indicate that an efficient method of utilizing the present-day empirical models is to select model parameters based on measurements from a few individual points. (C) 2001 COSPAR. Published by Elsevier Science Ltd. All rights reserved.

Original languageEnglish
Title of host publicationVALIDATION OF MAGNETOSPHERIC MODELS
EditorsT Pulkkinen, R Wolf
PublisherElsevier Science B.V.
Pages1717-1726
Number of pages10
ISBN (Print)*************
Publication statusPublished - 2001
MoE publication typeA4 Article in a conference publication
EventD3 4 Symposium of COSPAR Scientific Commission D - Warsaw, Poland
Duration: 1 Jul 2000 → …

Publication series

NameADVANCES IN SPACE RESEARCH
PublisherELSEVIER SCIENCE BV
Volume28
ISSN (Print)0273-1177

Conference

ConferenceD3 4 Symposium of COSPAR Scientific Commission D
CountryPoland
CityWarsaw
Period01/07/2000 → …
OtherHeld at the 33rd COSPAR Scientific Assembly

Keywords

  • CURRENT SHEET
  • TAIL
  • MAGNETOTAIL
  • ALGORITHM
  • ONSET

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