Fractal characteristics of the ULF emissions along a meridian profile, based on the 210 MM stations data |
| |
| Authors: | Anton Varlamov Natalia Smirnova Masashi Hayakawa and Kiyohumi Yumoto |
| |
| Abstract: | Fractal analysis of magnetic records (1 Hz sampling rate) of 5 stations (Guam, Moshiri, Paratunka, Magadan, and Chokurdakh)
located along the 210 magnetic meridian (210 MM) has been performed using the Higuchi method. The period of 22 months (October
1992 to July 1994) that embodies the date of the strong Guam earthquake of 8 August1993 has been considered. A comparison
of the ULF emissions scaling parameters (spectral exponents β and fractal dimensions D) obtained at different latitudes has been made. Dependence of β and D on the Kp index of geomagnetic activity has been analyzed for each of the 24 local time intervals. It is revealed that D decreases ( β increases) with increasing geomagnetic activity at all stations, but the rates of decrease (increase) are different at different
stations and in different time intervals. It is shown that the evening, night and early morning hours are preferable to study
magnetospheric effects, whereas the noon hours are the most suitable for the analysis of lithospheric effects. A possibility
of using the data of the 210 MM stations as reference materials for the Guam seismically active area is discussed. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
