 |
| Titel |
Relation between the height and size of sprites and the parameters of the triggering lightning flash - preliminary results |
| VerfasserIn |
J. Bór, J. Tóth, K. Yamashita, Y. Hobara, G. Sátori, M. Hayakawa, H. D. Betz |
| Konferenz |
EGU General Assembly 2012
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250066979
|
|
|
|
|
|
| Zusammenfassung |
| Sprites are brief luminous structures lasting for at most a few hundred milliseconds in the
50-90 km height range. This phenomenon is an optical emission accompanying
electric air discharges which occur in the quasi-static electric field above active
thunderstorms after tropospheric lightning discharges with extraordinary charge
moment changes (CMC). 23 sprite events appearing in Central Europe during the
summer of 2007 were observed simultaneously from Sopron [16.58Ë E, 46.68Ë
N], Hungary and from Modra Observatory [17.27Ë E, 48.37Ë N], Slovakia. The
location and height range of 64 individual sprites were determined by triangulation.
Lightning activity in thunderstorms in Central Europe has been monitored by sensors
of the LINET lightning detection network which operates in the VLF-LF (5-200
kHz) frequency range. Sprite producing lightning flashes were identified in the
LINET database by their detection times coincident both with the time point of the
corresponding optical observation and with the detection time of their characteristically high
amplitude extremely low frequency electromagnetic radiation recorded in the 5-30
Hz frequency range at Nagycenk Observatory (NCK; [16.72Ë E, 47.63Ë N]) in
Hungary. Polarity, peak current, and type (CG/IC) of the identified sprite producing
lightning flashes was reported by LINET. The CMC in these discharges was deduced
from the corresponding Schumann-resonance transients recorded at Moshiri station
[142.3Ë E, 44.4Ë N], Japan. The correspondences among these properties of the
sprite causing lightning flashes and the morphological type, size, and height of the
sprites are examined and the preliminary results of this investigation are presented. |
|
|
|
|
|
|