An example of the overlap of the field of view of the sun celestial body — picture was taken by space telescopes AIA by satellite SDO (USA). Dark disk — the Moon.
Geostationary satellite GOES-15 (USA), who is currently the main source of data for the formation of the catalog of solar flares, entered a phase of eclipse. For about a month and a half sight mounted on a satellite solar instruments once a day will completely overlap the Earth for about an hour. The first "antivspyshka" on the curve of solar activity was registered on February 26. Again the same enter orbit that does not intersect with the shadow of the Earth, the device should only be April 10-11. All the while, in the graphs of the flare activity around 9 am Moscow time will be recorded failures.
Seasons, eclipses are an unavoidable cost of choice for solar device geostationary orbit. Although in terms of observations of the sun, there's orbit, allowing to carry out, for real, continuous monitoring (eg, gravitational equilibrium point L1, is located between the Earth and the Sun), they concede the geostationary orbit in one — the ability to transmit data to Earth in real time. Namely in the case of the geostationary orbit, this problem is solved most simply, as the satellite is always in the same point in the sky, and can transmit data for monitoring the Sun to the Earth immediately after receiving them in space. In all other cases, to organize a continuous reception of satellite data can only cycling network of receiving stations along the entire trajectory of the satellite rotation around the Earth. In addition to vehicles GOES geostationary orbit operates the newest solar observatory NASA SDO, is also able to send photographs of the Sun obtained with minimal delay. End Domestic Solar Observatory, Coronas-Photon, output, for comparison, a low polar orbit, which cover the Earth every 30 minutes for a 1.5-hour circuit, and allowed to pass by the Earth observation data, only 4 times a day, with an average delay of 6 hours.
X-ray flux of the Sun, recorded satellite GOES-15, failed because eclipses satellite.
Data from 3-4 March 2011.
Besides the obvious interference observation, eclipses of the Sun and the Earth can get useful information. Before the radiation of the sun is completely blocked disk Earth is a few minutes gradually eclipsed by the Earth's atmosphere. It is for this reason that profiles emerging "antivspyshek" are not sharp, and the slope of the curve of decline and growth. Analyzing the inclination, you can draw conclusions about the physical condition of the earth's atmosphere, in particular its density at different altitudes. These GOES, however, it is too rough for this analysis, so for them, this effect is extremely negative. In particular, because of the eclipse seasons catalog GOES doschityvaetsya not more than 100 outbreaks in each solar cycle.
Laboratory of X-ray astronomy of the Sun (LPI).