Humain Radioastronomy Station

Observing the eclipse from Earth - clouds or not

In Humain, the eclipse will start at 09:27 Local Time, maximum at 10:34LT, and ends at 11:45LT. In Humain, the moon will cover 81.5 procent of the solar diameter.

Solar radio lightcurve

The curves to the left show the temporal evolution of the solar radio flux at five frequencies, between 329 and 870 MHz (resp. 91 and 34 cm of wavelength). The data are collected with a 6m dish from the Humain Radioastronomy Station, whose realtime pointing and picture are shown below.

The different radio light curves show the rise of the Sun, around 07:30UT (08:30 Local Time), while the telescope is pointing towards the East. It then starts tracking the Sun until approximately 16:00UT (17:00LT). The ripples seen on the curves are due to the solar radiation reflecting on the ground and interfering with the one directly collected by the telescope parabola. Spikes on the curves are either solar bursts (especially if they appear on different curves at the same time) or interference.

During the eclipse, the flux decreases as the Moon passes in front of the Sun. The radio Sun is more extended than the optical one because the radio emission at these frequencies originates from outer layers of the solar atmosphere (corona). Therefore, the radio eclipse will last a bit longer than the optical one.

The corona is not uniform due to active regions and other large scale coronal structures. The drop and increase of the intensity curve is not proportional to the solar atmosphere covered by the Moon, and can therefore be a-symmetric.

Antenna Pointing

The 2 dimensional map on the left provides an overview of all the important radio sources in the sky. The azimuth axis shows the horizon from 0 degrees North, over South (180 degrees) back to North. The elevation axis shows the height of the object above the horizon. 90 degrees, zenith, is right above your head, 0 degrees is just at the horizon.

Remark : Belgian Local Time (LT) = Universal Time (UT) + 1 hour