Spatial features of mid-latitude field-line resonances from simultaneous ground-satellite measurements
Three series of simultaneous pulsation measurements ( <i>f</i><0.06 Hz) on the Freja satellite and at the Budkov Observatory have been spectrally processed (FFT) in 6-min intervals of Freja's transits near the local Budkov field line. Doppler-shifted, weighted spectral-pe...
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
1996-07-01
|
| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/14/699/1996/angeo-14-699-1996.pdf |
| _version_ | 1819238624412041216 |
|---|---|
| author | K. Prikner |
| author_facet | K. Prikner |
| author_sort | K. Prikner |
| collection | DOAJ |
| description | Three series of simultaneous pulsation
measurements ( <i>f</i><0.06 Hz) on the Freja satellite and at the Budkov
Observatory have been spectrally processed (FFT) in 6-min intervals of Freja's
transits near the local Budkov field line. Doppler-shifted, weighted
spectral-peak frequencies, determined in both transverse magnetic components in
the mean field-aligned coordinate system on Freja, allowed the estimation, by
comparison with the stable frequency at Budkov, of fundamental frequencies of
the local magnetic-field-line resonance ranged from 13 to 17 mHz in two
pulsation events analyzed, with <i>K<sub>p</sub></i>=2<sub>+</sub> to 0<sub>+</sub>.
The ratio of total amplitudes of the spectral-pulsation components on the ground
and on Freja at an altitude of ~1700 km (values <0.7) characterizes the
transmissivity of the ionosphere. In the Pc3 frequency range this correlates
well with simulation computations using models of the ionosphere under low solar
activity. |
| first_indexed | 2024-12-23T13:39:11Z |
| format | Article |
| id | doaj.art-e9ce8801559a48dcb318f3035f985f1d |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-23T13:39:11Z |
| publishDate | 1996-07-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-e9ce8801559a48dcb318f3035f985f1d2022-12-21T17:44:55ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05761996-07-011469970610.1007/s00585-996-0699-xSpatial features of mid-latitude field-line resonances from simultaneous ground-satellite measurementsK. PriknerThree series of simultaneous pulsation measurements ( <i>f</i><0.06 Hz) on the Freja satellite and at the Budkov Observatory have been spectrally processed (FFT) in 6-min intervals of Freja's transits near the local Budkov field line. Doppler-shifted, weighted spectral-peak frequencies, determined in both transverse magnetic components in the mean field-aligned coordinate system on Freja, allowed the estimation, by comparison with the stable frequency at Budkov, of fundamental frequencies of the local magnetic-field-line resonance ranged from 13 to 17 mHz in two pulsation events analyzed, with <i>K<sub>p</sub></i>=2<sub>+</sub> to 0<sub>+</sub>. The ratio of total amplitudes of the spectral-pulsation components on the ground and on Freja at an altitude of ~1700 km (values <0.7) characterizes the transmissivity of the ionosphere. In the Pc3 frequency range this correlates well with simulation computations using models of the ionosphere under low solar activity.https://www.ann-geophys.net/14/699/1996/angeo-14-699-1996.pdf |
| spellingShingle | K. Prikner Spatial features of mid-latitude field-line resonances from simultaneous ground-satellite measurements Annales Geophysicae |
| title | Spatial features of mid-latitude field-line resonances from simultaneous ground-satellite measurements |
| title_full | Spatial features of mid-latitude field-line resonances from simultaneous ground-satellite measurements |
| title_fullStr | Spatial features of mid-latitude field-line resonances from simultaneous ground-satellite measurements |
| title_full_unstemmed | Spatial features of mid-latitude field-line resonances from simultaneous ground-satellite measurements |
| title_short | Spatial features of mid-latitude field-line resonances from simultaneous ground-satellite measurements |
| title_sort | spatial features of mid latitude field line resonances from simultaneous ground satellite measurements |
| url | https://www.ann-geophys.net/14/699/1996/angeo-14-699-1996.pdf |
| work_keys_str_mv | AT kprikner spatialfeaturesofmidlatitudefieldlineresonancesfromsimultaneousgroundsatellitemeasurements |