 |
| Titel |
Travelling ionospheric disturbance over California mid 2000 |
| VerfasserIn |
M. Hawarey |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1023-5809
|
| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 13, no. 1 ; Nr. 13, no. 1 (2006-01-16), S.1-7 |
| Datensatznummer |
250011700
|
| Publikation (Nr.) |
 copernicus.org/npg-13-1-2006.pdf |
|
|
|
|
|
| Zusammenfassung |
| In this paper, the GPS data collected by more than 130 permanent GPS
stations that belong to the Southern California Integrated GPS Network
(SCIGN) around the launch of a Minuteman-II missile on 8 July 2000 (UTC) is
processed to reveal traveling ionospheric disturbance (TID) all over the
network on average 15 min after the launch. This TID was initially
perceived to be excited by the launch itself, but this conclusion is
challenged by the propagation direction. This is because this TID seems to
travel towards the air force base from where the launch took place, not far
away from it. This challenge is based on the assumption that TID is
occurring at one single ionospheric altitude. While the nature of ionosphere
supports such horizontally-guided propagation, multi-altitude ionospheric
pierce points are hypothesized, which would support the suggestion that
detected TID is excited by the missile launch itself, despite the apparent
reverse direction of propagation. The overall analysis rules out any
extra-terrestrial sources like solar flares, or seismic sources like
earthquakes, which confirms the conclusion of TID excitation by the launch.
There is apparent coherence of the TID for about 45 min and the
propagation speed of TID within the layer of ionosphere is calculated to be
approximately equal to 1230 m/s. While the usual assumption for TID is
that they occur around an altitude of 350 km, such sound speed can only
occur at much higher altitudes. Further research is recommended to
accurately pinpoint the ionospheric pierce points and develop an algorithm
to locate the source of TID in case it is totally unknown. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|