The Second World War Independently By Stanley Hey of Britain

The second world war independently by Stanley Hey of Britain

  The shorter radio waves of wavelength - I cm come from the lower chromosphere which corresponds to a radiation temperature of 10 K. Meter and decameter wavelengths which are generated at the lower chromosphere are absorbed by ionized gas in the upper chromosphere and the corona, and therefore, cannot reach the Earth.

 The radio source was missed primarily due to poor technological advancement in those years. The discovery was finally made during the second world war independently by Stanley Hey of Britain, and by G.C. Southworth and G. Reber of the U.S.A. The subsequent decades were marked by intensive as well as extensive studies of the solar radio emission by scientists all over the world.

 The study of the radio-spectrum of the Sun has revealed that the radio emission from the Sun can be classified into two well-defined components: (a) a slowly varying component with sufficiently lone characteristic times, and (b) the sporadie burst component having much shorter characteristic times. The first component is of thermal origin and is recognized as the characteristic of the quiet Sun, while the second component is nonthermal which is characteristic of the disturbed Sun.

 As a hot body the Sun must emit radiations in rauio wavelengths, but since the temperature of the Sun is not uniquely defined (being different at different levels of the atmosphere) the nature of the solar thermal radio emission is altitude-dependent.

 The highly ionized corona is completely opaque to longer radio waves just as the case with the Earth's ionosphere. Thus, observing the Sun at different radio wavelengths means observing at different levels of its ätmosphere. This also enables us to distinguish between different levels in chromosphere and corona from which various disturbances give rise to radio emission.