A neural network-based local model for prediction of geomagnetic disturbances

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

This study shows how locally observed geomagnetic disturbances can bepredicted from solar wind data with artificial neural network (ANN)techniques. After subtraction of a secularly varying base level, thehorizontal components X<SUB>Sq</SUB> and Y<SUB>Sq</SUB> of the quiettime daily variations are modeled with radial basis function networkstaking into account seasonal and solar activity modulations. Theremaining horizontal disturbance components DeltaX and DeltaY aremodeled with gated time delay networks taking local time and solar winddata as input. The observed geomagnetic field is not used as input tothe networks, which thus constitute explicit nonlinear mappings from thesolar wind to the locally observed geomagnetic disturbances. The ANNsare applied to data from Sodankylä Geomagnetic Observatory locatednear the peak of the auroral zone. It is shown that 73% of the DeltaXvariance, but only 34% of the DeltaY variance, is predicted from asequence of solar wind data. The corresponding results for prediction ofall transient variations X<SUB>Sq</SUB>+DeltaX andY<SUB>Sq</SUB>+DeltaY are 74% and 51%, respectively. The local timemodulations of the prediction accuracies are shown, and the qualitativeagreement between observed and predicted values are discussed. If drivenby real-time data measured upstream in the solar wind, the ANNs heredeveloped can be used for short-term forecasting of the locally observedgeomagnetic activity.

Detaljer

Författare
  • Hans Gleisner
  • Henrik Lundstedt
Enheter & grupper
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Astronomi, astrofysik och kosmologi

Nyckelord

Originalspråkengelska
Sidor (från-till)8425-8434
TidskriftJournal of Geophysical Research
Volym106
Utgåva nummerA5
StatusPublished - 2001
PublikationskategoriForskning
Peer review utfördJa