Relations of field line resonances and upstream waves and the winter attenuation of pulsations
Using data on the occurrence frequency of geomagnetic pulsations of different periods from three observatories in Central Europe, conclusions are drawn about the occurrence of field line resonances and pulsations directly driven by upstream waves at <i>L</i>-values below 3. It was fo...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
1995-07-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/13/689/1995/angeo-13-689-1995.pdf |
| Summary: | Using data on the occurrence frequency of
geomagnetic pulsations of different periods from three observatories in Central
Europe, conclusions are drawn about the occurrence of field line resonances and
pulsations directly driven by upstream waves at <i>L</i>-values below 3. It was
found that both types occur during the interval studied (first 6 months of the
year 1991), but both the occurrence frequency of the two types and the
characteristic period of the field line resonance change significantly as
compared to other intervals. During Northern winter, pulsation activity is
severely damped in solar maximum years, including the year 1991. The decrease in
the activity of the pulsations is more significant at shorter periods. |
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| ISSN: | 0992-7689 1432-0576 |