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Observations of auroral fading before breakup
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Heikkila, W. J. Pellinen, R. J. |
| Copyright Year | 1978 |
| Description | The onset of auroral breakup was studied by using a variety of instruments with time resolution of some tens of second. Rapid sequences of all-sky photographs, and fast meridian scans by photometers, show that breakup is usually preceded by moderate brightening, followed by fading of the auroral brightness lasting one or two minutes, before the actual breakup itself. This optical activity is closely correlated with the development of auroral radar echoes. Data from a magnetometer network provide some indication of a correlated response by the local auroral and ionospheric currents. Riometer recordings show a slow decrease in ionspheric radio wave absorption over a period of about ten minutes prior to breakup, with the largest decrease essentially to quiet-time values in the region of auroral fading and subsequent breakup. |
| File Size | 3404762 |
| Page Count | 41 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19780017764 |
| Archival Resource Key | ark:/13960/t71w09q5j |
| Language | English |
| Publisher Date | 1978-02-01 |
| Access Restriction | Open |
| Subject Keyword | Geophysics Fading All Sky Photography Riometers Magnetometers Auroral Absorption Auroras Ionospheric Currents Radar Echoes Sky Brightness Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
