The ionospheric D-layer (60 and 90km) is also called the “ignorosphere”, clearly indicating the level of knowledge on this atmospheric layer. Its electron content follows a daily cycle, but also the seasonal cycle of the solar UV flux radiation. In addition to these long-period variations, the D-layer electron density is submitted to much faster

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De parranda cantando Isas y Folías

The Javalambre Photometric Local Survey (J-PLUS) is an ongoing 12-band photometric optical survey, observing thousands of square degrees of the Northern hemisphere from the dedicated JAST/T80 telescope at the Observatorio Astrofísico de Javalambre. The larger field of view (FoV), high spatial resolution, contiguous narrow band filters cover a wide

The intensity interferometry technique enables telescopes to achieve exceptionally high angular resolutions, on the order of hundreds of microarcseconds, in the optical range. I will explain how, in contrast to traditional phase interferometry, this technique readily accommodates blue and near UV wavelengths, and is straightforward to expand to