HR: 0800h
AN: SA11A-0301    [Abstracts]
TI: Geophysical Effects of Solar Eclipse of 29 March 2006
AU: * Gavrilov, B G
EM: gavrilov@idg.chph.ras.ru
AF: Institute of Geospheres Dynamics RAS, 38 Leninsky prosp., bld.1, Moscow, 119334, Russian Federation
AU: Adushkin, V V
EM: adushkin@idg.chph.ras.ru
AF: Institute of Geospheres Dynamics RAS, 38 Leninsky prosp., bld.1, Moscow, 119334, Russian Federation
AU: Gorely, K I
EM: gorely@idg.chph.ras.ru
AF: Institute of Geospheres Dynamics RAS, 38 Leninsky prosp., bld.1, Moscow, 119334, Russian Federation
AU: Rybnov, Y S
EM: rybnov@idg.chph.ras.ru
AF: Institute of Geospheres Dynamics RAS, 38 Leninsky prosp., bld.1, Moscow, 119334, Russian Federation
AU: Kharlamov, V A
EM: vak@idg.chph.ras.ru
AF: Institute of Geospheres Dynamics RAS, 38 Leninsky prosp., bld.1, Moscow, 119334, Russian Federation
AB: Infrasonic, radio physical, electric and magnetic fields measurements were spent at geophysical station Mikhnevo of the Institute of Geospheres Dynamics of Russian Academy of Science located in 80 km from Moscow during a solar eclipse of 29 March 2006. During the maximum phase of the eclipse the atmosphere acoustic- gravity waves on frequency close to Brent-Vaisala frequency were excited. Global variations of the total electron content of the ionosphere were also registered. Revealing of these effects on a distance more than 2000 km from a zone of a total solar eclipse shows that perturbations of the ionosphere had global character and quickly extended on significant distances. Change of the geomagnetic field in the form of a positive bay have arise at the maximum phase of the eclipse. Change of the spectral density of the near-earth electric field variations of the frequencies of the order of 10 mHz were coincided with variations of the TEC of the ionosphere. Effects of the eclipse have been investigated also by a method of Doppler tilt sounding on short-wave radio paths crossing the trajectory of moon shadow movement under different angles. The character of a radio signals reaction reminds a blackout during solar x-ray flashes. So, the solar eclipse was accompanied by the ionosphere perturbations which could be caused both by direct effects of a change of the solar radiation, and by their imposing on the ionosphere electron density distribution above the Eastern hemisphere. Superposition of these effects has led to excitation of the ionosphere wave perturbations of different type and scale (thermosphere winds, acoustic-gravity waves) and to variations of the TEC of the ionosphere.
DE: 0360 Radiation: transmission and scattering
DE: 0394 Instruments and techniques
DE: 0654 Plasmas
DE: 0689 Wave propagation (2487, 3285, 4275, 4455, 6934)
DE: 0925 Magnetic and electrical methods (5109)
SC: SPA-Aeronomy [SA]
MN: 2007 Fall Meeting