The Hanoi Times - It’s predicted that between 12-20 magnetic storms will affect Vietnam during 2009, threatening the health of magnetism-sensitive people or heart disease patients, according to Dr Ha Duyen Chau, acting head of the Global Physics Institute.The impact of magnetic storms o­n Vietnam will be even more dramatic because Vietnam lies near the equator and the effects are expected to be greater in southern Vietnam, said Mr Chau.Such storms can make victims feel tired and increase their blood pressure to abnormally high levels. Some older people may also be vulnerable to cardiac arrest.Scientists warn that o­n days when magnetic storms are to take place, people should avoid outdoor activities and drink plenty of water to prevent their blood thickening.Strong magnetic storms measured at 650nT (nano tesla) appeared in Vietnam in 2001