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<p><strong>Abstract.</strong> An ionosonde network consisting of a meridional chain and an equatorial pair was established in the Southeast Asian area. Three of four ionosondes are along the magnetic meridian of 100&deg; E; two are close to the magnetic conjugate points in Northern Thailand and West Sumatra, Indonesia, and the other is near the magnetic equator in the Malay Peninsula, Thailand. The fourth ionosonde is also near the magnetic equator in Vietnam but separated by aboutdoi:10.5194/angeo-25-1569-2007 fatcat:qwjhyxi4ifggzpqexqbcdscvrq