The Atmospheric and Terrestrial Mobile Laboratory (ATML).

Conference · Thu Apr 01 04:00:00 EDT 2010

DOI:https://doi.org/10.1029/2010JA015417· OSTI ID:992303

Zak, Bernard Daniel; Rahn, Thom ^[1]; Nitschke, Kim ^[1]; Ivey, Mark D; Mora, Claudia ^[1]; McDowell, Nate ^[1]; Love, Steve ^[1]; Dubey, M ^[1]; Michelsen, Hope A; Guilderson, Tom ^[2]; Schubert, William Kent; Costigan, Keeley ^[1]; Chylek, Petr ^[1]; Bambha, Ray P; Roskovensky, John K

---

1. Los Alamos National Laboratory
2. Lawrence Livermore National Laboratory

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.

• Research Organization: Sandia National Laboratories
• Sponsoring Organization: USDOE
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 992303
• Report Number(s): SAND2010-2148C
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
AMPLITUDES
DISTURBANCES
GENERAL CIRCULATION MODELS
MONITORING
NORTHERN HEMISPHERE
STORMS