منابع مشابه
Long-term trends in the ionospheric E and F1 regions
Ground based ionosonde measurements are the most essential source of information about long-term variations in the ionospheric E and F1 regions. Data of such observations have been derived at many different ionospheric stations all over the world some for more than 50 years. The standard parameters foE, h’E, and foF1 are used for trend analyses in this paper. Two main problems have to be consid...
متن کاملTrends in the ionospheric E and F regions over Europe
Continuous observations in the ionospheric E and F regions have been regularly carried out since the ®fties of this century at many ionosonde stations. Using these data from 31 European stations long-term trends have been derived for dierent parameters of the ionospheric E layer (h¢ E, foE), F1 layer (foF1) and F2 layer (hmF2, foF2). The detected trends in the E and F1 layers (lowering of the ...
متن کاملSporadic hepatitis E in southern India.
The definite existence of a second enterically transmitted hepatitis virus (non-A) was recognized in 1980 and retrospectively diagnosed to have caused the 1955 Delhi epidemic (KHUROO, 1980; TICEHURST, 1995). The name hepatitis E virus (HEV) was proposed for the agent in 1988; bv the vear 1990 its identitv was firmlv established when its genomic structure was elucidated (F&YES et al.. 1990). Unt...
متن کاملThe lunar tide in sporadic E
It seems that the wind shear theory is accepted for the explanation of sporadic E at mid and low latitudes. Some examples from Arecibo are displayed to show this. The eect of lunar tides should then modify the wind-shear theory in a manner that yields the observed features of the lunar tide in the critical frequency foEs and the height h¢Es of the sporadic E. This is shown to imply that the ph...
متن کاملIonospheric E region remote sensing with ELF radio atmospherics
Radio remote sensing of the ionospheric E region can be difficult, particularly in the nighttime E region valley which lies between two regions of higher electron density. We show that extremely low frequency (ELF) electromagnetic waves launched from below penetrate this region because of their low attenuation and can be reflected from both the D region and the top of the E region valley. This ...
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ژورنال
عنوان ژورنال: Australian Journal of Physics
سال: 1956
ISSN: 0004-9506
DOI: 10.1071/ph560159