The Atmospheric and Terrestrial Mobile Laboratory (ATML).
The ionospheric disturbance dynamo signature in geomagnetic variations is investigated using the National Center for Atmospheric Research Thermosphere-Ionosphere-Electrodynamics General Circulation Model. The model results are tested against reference magnetically quiet time observations on 21 June 1993, and disturbance effects were observed on 11 June 1993. The model qualitatively reproduces the observed diurnal and latitude variations of the geomagnetic horizontal intensity and declination for the reference quiet day in midlatitude and low-latitude regions but underestimates their amplitudes. The patterns of the disturbance dynamo signature and its source 'anti-Sq' current system are well reproduced in the Northern Hemisphere. However, the model significantly underestimates the amplitude of disturbance dynamo effects when compared with observations. Furthermore, the largest simulated disturbances occur at different local times than the observations. The discrepancies suggest that the assumed high-latitude storm time energy inputs in the model were not quantitatively accurate for this storm.
- (Los Alamos National Laboratory)
- (Lawrence Livermore National Laboratory)
- Publication Date:
- OSTI Identifier:
- Report Number(s):
Journal ID: ISSN 0148-0227; TRN: US201022%%274
- DOE Contract Number:
- Resource Type:
- Resource Relation:
- Journal Volume: 115; Journal Issue: a11; Conference: Proposed for presentation at the NOAA/ESRL Global Monitoring Annual Conference held May 18-19, 2010 in Boulder, CO.
- Research Org:
- Sandia National Laboratories
- Sponsoring Org:
- Country of Publication:
- United States
- 54 ENVIRONMENTAL SCIENCES; AMPLITUDES; DISTURBANCES; GENERAL CIRCULATION MODELS; MONITORING; NORTHERN HEMISPHERE; STORMS