 Posted: Tue Aug 16, 2011 2:54 pm |
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Trua nay (16/
, tai thanh pho Lao Cai da quan sat duoc hien tuong “quang mat troi”. Thoi gian quang mat troi ton tai khoang 50 phut, bat dau luc 12 gio 30 phut, ket thuc luc 13 gio 20 phut.
Quang la hien tuong quang hoc cua tu nhien, khi quang mat troi xuat hien la luc thoi tiet kho rao, khong mua, troi co nang to.
Quang chi xuat hien vao ban ngay (co mat troi), hoac ban dem (co mat trang) trong mua ha va mua thu hang nam. Quang mat troi, mat trang la hien tuong quang hoc, do anh sang cua mat troi hoac mat trang chieu qua dam may tang cao (dộ cao khoang 7 - 8km); may co cau truc la cac tinh the bang, anh sang mat troi, mat trang bi khuc xa, phan xa sinh ra nhung vong tron. Truong hop khuyet la nua vong tron, voi tam la mat troi (hoac mat trang). Quang mat troi, mat trang co 7 mau nhu mau sac cua cau vong, tuy nhien, su sap xep mau cua quang nguoc lai voi cau vong: Trong cung la mau do, tiep den la da cam, vang, luc, lam, cham, tim.
Quang mat troi xuat hien o thanh pho Lao Cai trua nay (Anh: Pham Duc)
Trung binh khoang 4 den 5 nam, Tram Khi tuong Lao Cai lai quan trac duoc hien tuong quang mat troi hoac quang mat trang.
TheoLuu Minh Hai
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