Magnetic and Ionospheric Observations During the October 24,1995 Total Solar Eclipse in Vietnam

1995年10月24日日蝕時在越南所觀察之地磁及電離層變化

Nguyen Thi Kim Thoa；Ha Duyen Chau；Truong Quang Hao；Pham Van Tri；Vo Thanh Son；Luong Van Truong；Vu Hong Nam

Geomagnetism ； Ionosphere ； Total Solar Eclipse ； Equatorial Electrojet ； Magnetic Equator ； Magnetogram

Terrestrial, Atmospheric and Oceanic Sciences

8卷2期（1997 / 06 / 01）

155 - 164

英文

On October 24,1995 a solar eclipse occurred with its path of totalitypassing over southern Asia,but the associated region of its partial eclipsecovered almost all of Asia.It was therefore of interest to investigate howthe ionosphere responded to this eclipse,especially because the region includedthe equatorial anomaly region.For this purpose the authors collectedand processed ionosonde data from six stations in the region.Thesedata reveal three effects that are coherent geographically in that they coverat least two of these six stations:(1)For the region with geomagnetic latitudeshigher than 20 degrees,the N(subscript max)increased slightly immediately followingthe first contact for about 30 minutes.(2)In response to the eclipse,the largest depression occurring roughly 11/2 hours after the maximumobscuration was observed at approximately 14 degrees geomagnetic latitudeeven though the percent obscuration of the Sun at latitudes lower than14 degrees was larger.(3)Around 6 hours after the maximum phase anothersecondary depression in the N(subscript max)was observed for geomagnetic latitudeslower than 14 degrees.Physical mechanisms that may be responsiblefor causing these effects are proposed and examined in this paper.They areall related to eclipse-caused dynamic effects.

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