Estimation of magnetic field mapping accuracy using the pulsating aurora-chorus connection
Article first published online: 27 JUL 2011
Copyright 2011 by the American Geophysical Union.
Geophysical Research Letters
Volume 38, Issue 14, July 2011
How to Cite
2011), Estimation of magnetic field mapping accuracy using the pulsating aurora-chorus connection, Geophys. Res. Lett., 38, L14110, doi:10.1029/2011GL048281., et al. (
- Issue published online: 27 JUL 2011
- Article first published online: 27 JUL 2011
- Manuscript Accepted: 10 JUN 2011
- Manuscript Revised: 9 JUN 2011
- Manuscript Received: 26 MAY 2011
- lower-band chorus;
- magnetic field mapping;
- pulsating aurora
 Although magnetic field models are widely used in magnetosphere-ionosphere coupling studies to perform field-line mapping, their accuracy has been difficult to estimate experimentally. Taking advantage of the high correlation between lower-band chorus and pulsating aurora, we located the THEMIS spacecraft footprint within ∼km accuracy and calculated the differences from mappings given in widely-used Tsyganenko models. Using 13 conjunctions of the THEMIS spacecraft and ground-based imagers, we found that the Tsyganenko model footprints were located within 1°–2° magnetic latitude and 0.1–0.2 h magnetic local time of our derived footprint. The deviation between the footprints has a consistent dependence on geomagnetic activity. Our results showed that the real magnetic field tends to be less stretched than that in the Tsyganenko models during quiet times and comparable to or more stretched during disturbed times. This approach can be used to advance modeling of field lines that connect to the near-Earth plasma sheet.