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° 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. https://fitnessgravesyardes.shop/product-category/shaft-assembly/