HR: 0800h
AN: GP41D-03    [Abstracts]
TI: Possible forerunners of earthquakes in optical range
AU: * Malnev, V N
EM: malnev@i.com.ua
AF: Taras Shevchenko Kyiv University, Kyiv, 252017, Ukraine,
AU: Martysh, E V
EM: malnev@i.com.ua
AF: Taras Shevchenko Kyiv University, Kyiv, 252017, Ukraine,
AU: Koshevya, S
EM: svetlana@uaem.mx
AF: CIICAp, UAEM, Cuernavaca, Morelos, Mexico, Mexico
AU: Kotsarenko, A
EM: kotsarenko@geociencias.unam.mx
AF: CGeo, UNAM, Queretaro, QRO, Mexico, Mexico
AU: Siqueiros Alatorre, J
EM: jsiqueiros@uaem.mx
AF: CIICAp, UAEM, Cuernavaca, Morelos, Mexico, Mexico
AB: The monitoring of the electrostatic field on the eve of the strong earthquakes detect its ultra-low-frequency perturbations with a period of a few hours (10^-4Hz) and a magnitude of the order of 10 V/cm. Usually this field is on the level of one V/cm. The anomalous electric field as a forerunner of the coming earthquake considerably increases a concentration of the metal ions (sodium) in the E-domain at altitudes ~120 km and the electron concentration, as well. In particular, the latter may enlarge by one order comparing with the initial electron concentration in this domain. The typical dimensions of this layer are ~ 100 km in a length and ~ 10 km in a thickness. The perturbations of this electric field form a layer with higher than usual concentration of sodium ions and atoms in the E- ionosphere and the field will heats-up electrons in this layer. Simple evaluations show the electron temperature in this layer in the presence of the seismogenic electric field is approximately about 1000-1300K at altitudes 100-120 km provided that the electric field is ~ 10^-3 V/cm. It is important the cross-section of excitation of the nitrogen low vibration levels by electrons at this energy is anomalous and close to 5x10^-15cm². It happens to be that the eighth vibration level of a nitrogen molecule practically coincides with the first excited state of a sodium atom with energy E_Na=2.1eV. Thus, the resonant transfer of the vibration energy of excited nitrogen with excitation of a sodium atom takes place practically in every collision. Our evaluation of the sodium doublet intensity due to the above-discussed mechanism from the ionosphere layer, mentioned above, gives 5x10^-3erg/cm²s. A comparison of this quantity with the conventional intensity of the sodium doublet from this layer 7x10^-4erg/cm²s shows that the suggested mechanism provides the intensity almost by one order larger than the conventional intensity of the sodium doublet. The considerable increasing in the intensity of the sodium doublet in the spectrum of the night ionosphere can be registered by monitoring the night sky over the seismic dangerous regions.
DE: 0468 Natural hazards
DE: 0649 Optics (4264)
DE: 3934 Optical, infrared, and Raman spectroscopy
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2007 Joint Assembly