No, it hasn't. Read this:
Not a convincing article.
From the article cited: "Unfortunately, because it has proved difficult to merge the data from consecutive satellites in the series that have watched the sun for the past 20 or so years, it is not certain whether the sun's output has increased over that period. One study found that there had been no increase over that time period. A second found that that there had been a small increase (around 0.1%)."
Sorry, but 0.1% is not a small increase. Thats the difference between the solar maximus and solar minimus.
The article then goes on to try and compare various solar measurements with what appears to be ground-based measurements. Ground-based measurements have been largely discredited because of urban heating effects.
The article then references another article that states: "Willson (Columbia University solar physicist) says his work with ACRIM and a handful of other sensors shows not only that the total solar irradiance varies over the 11-year solar cycle, but that it has crept upward between the last two solar minimums."
Wait a minute. How do you explain the global warming on Mars if the sun is not putting out more energy?