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SUNDIAL: A world-wide study of interactive ionospheric processes and their roles in the transfer of energy and mass in the sunearth-system

Document Type

Article

Journal/Book Title/Conference

Annales Geophysicae

Volume

6

Issue

3

Publisher

European Geosciences Union

Publication Date

1988

Abstract

During the period 5-13 October 1984 a coordinated solar-terrestrial data base was acquired to develop a comprehensive understanding and an associated predictive capability for the cause-effect relationships which control the global-scale ionosphere. The effort, the first in a series of continuing investigations in a program called SUNDIAL, combined modelling of the ionospheric, magnetospheric, and thermospheric domains with a measurements activity that included a network of ionospheric monitoring stations a high-, middle-, and low latitudes in the American, European/African, and Asian/Australian sectors. Solar, solar wind, interplanetary, and geomagnetic data were also obtained through the NOAA Space Environment Services Center. The increased solar wind velocities resulted from a corotating high-speed stream coupled to a transequatorial solar coronal hole. Evidence points to a step-wise coupling of processes form te coronal hole through the interplanetary and magnetospheric domains down to the equatorial ionosphere, where penetrating electric fields participated in triggering the most disturbed condition of equatorial spread-F ever recorded by the Jicamarca Observatory. The correlation of events also included: (1) enhanced particle precipitation power at high latitudes, (2) an associated cross polar cap potential of 75 kV, and (3) simultaneous global observations of F-region dynamics. In addition, detailed model comparisons with observations of the quiet and disturbed ionosphere point to requirements for improved global specification of thermospheric winds and electric fields. The content of this paper presents an overview of the program, its initial findings, recommendations, and future perspectives

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