Sentences with phrase «solar faculae»

The origin of a slowly varying irradiance component may derive from changes in the solar faculae and / or in the background solar radiation from solar quiet regions.

Not exact matches

Because of the variations of sunspots and faculae on the sun's surface, the total solar irradiance (TSI), also called the solar constant, varies on a roughly 11 - year cycle by about 0.07 %, which has been measured by orbiting satellites since 1978 [Lean, 1987, 1991; Wilson et al., 1981].

Foukal point out correctly that the arguments used for supporting a long term solar component — other than that related to sunspot / faculae — have fallen down.

This increase has not been measured by the other satellite measuring at this period (ERBS); b) other indicators of solar activity, which are closely correlated to TSI (sunspot number, faculae, geomagnetic activity) show no trend in that period, either.

Since the solar UV irradiance has no long - term trend, the mechanism for the secular change of TSI must differ from the effect of surface magnetism, as manifested by sunspots, faculae, and network which indeed explain well the intra-cycle variability of both total and spectral irradiance.

That jibes with the idea of a cooling trend during solar minimum; fewer spots means fewer faculae, so the Sun emits less Earth - warming radiation.

Sunspots are surrounded by a rim called faculae, and in this region the temperatures are actually higher than the average solar surface.

In this study, we address the question of whether the observed decrease in the TSI is the result of evolving solar surface magnetism (sunspots and faculae).

Key words: methods: data analysis / solar - terrestrial relations / Sun: activity / Sun: faculae, plages / Sun: magnetic fields / sunspots

We use a TSI model that is solely based on solar surface magnetic phenomena (sunspots and faculae including network).

Because our main goal is to reproduce the centennial solar variability and because magnetograms are unavailable for historical time periods, we scale the faculae and the active network filling factors with the sunspot number instead of using filling factors derived from available magnetogram data.

One explanation for the postulated reduction in solar radiation during the 17th century Maunder Minimum is that the Sun's surface was not only largely devoid of spots and faculae, but also less bright, overall.

Key words: Sun: solar - terrestrial relations / methods: data analysis / Sun: activity / Sun: faculae, plages / Sun: magnetic fields / Sun: sunspots

In years of maximum solar activity, it is the bright faculae that prevail, raising the levels of both total and UV radiation.