Combined ESR and EISCAT observations of the dayside polar cap and auroral oval during the May 15, 1997 storm

International audience The high-latitude ionospheric response to a major magnetic storm on May 15, 1997 is studied and different responses in the polar cap and the auroral oval are highlighted. Depletion of the F 2 region electron density occurred in both the polar cap and the auroral zone, but due...

Full description

Bibliographic Details
Main Authors: Liu, Hong, Schlegel, K., Ma, S.-Y.
Other Authors: Max-Planck-Institut für Aeronomie (MPI Aeronomie), Max-Planck-Gesellschaft, Space physics department, Wuhan Ionospheric Observatory, Wuhan Institute of Physics and Mathematics
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2000
Subjects:
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
EISCAT
Online Access:https://hal.science/hal-00316776
https://hal.science/hal-00316776/document
https://hal.science/hal-00316776/file/angeo-18-1067-2000.pdf
Description
Summary:International audience The high-latitude ionospheric response to a major magnetic storm on May 15, 1997 is studied and different responses in the polar cap and the auroral oval are highlighted. Depletion of the F 2 region electron density occurred in both the polar cap and the auroral zone, but due to different physical processes. The increased recombination rate of O + ions caused by a strong electric field played a crucial role in the auroral zone. The transport effect, however, especially the strong upward ion flow was also of great importance in the dayside polar cap. During the main phase and the beginning of the recovery phase soft particle precipitation in the polar cap showed a clear relation to the dynamic pressure of the solar wind, with a maximum cross-correlation coefficient of 0.63 at a time lag of 5 min.

Similar Items