Large-scale magnetic field perturbation arising from the 18 May 1980 eruption from Mount St. Helens, Washington

Details Large-scale magnetic field perturbation arising from the 18 May 1980 eruption from Mount St. Helens, Washington Large-scale magnetic field perturbation arising from the 18 May 1980 eruption from Mount St. Helens, Washington

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...57...23m&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 57, Issue 1-2, p. 23-31.

Physics

7

Scientific paper

A traveling magnetic field disturbance generated by the 18 may 1980 eruption of Mount St. Helens at 1532 UT was detected on an 800-km linear array of recording magnetometers installed along the San Andreas fault system in California, from San Francisco to the Salton Sea. Arrival times of the disturbance field, from the most northern of these 24 magnetometers (996 km south of the volcano) to the most southern (1493 km S23° E), are consistent with the generation of a traveling ionospheric disturbance stimulated by the blast pressure wave in the atmosphere. The first arrivals at the north and the south ends of the array occurred at 26 and 48 min, respectively, after the initial eruption. Apparent average wave velocity through the array is 309 +/- 14 m s-1 but may have approached 600 m s-1 close to the volcano. The horizontal phase and the group velocity of ~ 300 m s-1 at periods of 70-80 min, and the attenuation with distance, strongly suggest that the magnetic field perturbations at distances of 1000-1500 km are caused by gravity mode acoustic-gravity waves propagating at F-region heights in the ionosphere.

Affiliated with

Also associated with

No associations

Rating

Large-scale magnetic field perturbation arising from the 18 May 1980 eruption from Mount St. Helens, Washington does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Large-scale magnetic field perturbation arising from the 18 May 1980 eruption from Mount St. Helens, Washington, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Large-scale magnetic field perturbation arising from the 18 May 1980 eruption from Mount St. Helens, Washington will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1532090