Solar Physics

Rotational and Activity Evidence for a Subgiant with a Sun-Like Cycle

Sun-like activity cycle of HD 81809 binary system in calcium HK emission
Wednesday, October 10, 2018

HD 81809 has one of the highest-quality activity cycles from the sample of stars synoptically observed in the Mount Wilson Observatory HK Project.

Outreach and Observing at Mauna Loa in Hawaii

Lisa Waters demonstrating magnetic fields and effects on the sun

Educational outreach is an important and rewarding part of an observer’s job at the Mauna Loa Solar Observatory (MLSO) site located on the flanks of Mauna Loa Mountain at an elevation of 3440 meters in the U.S. state of Hawai’i.

Sources, sinks and propagation characteristics of the quasi 6-day wave and its impact on the residual mean circulation

Amplitudes of the Q6DW as a function of latitude and time
Saturday, August 25, 2018

This study, by Pedatella and others, employs a troposphere to lower thermosphere reanalysis dataset generated by the Whole Atmosphere Community Climate Model with data assimilation provided by the Data Assimilation Research Testbed (WACCM+DART).

Suppression of the polar tongue of ionization during the 21 August 2017 solar eclipse

Polar maps of differential TEC
Saturday, August 4, 2018

It has long been recognized that during solar eclipses, the ionosphere-thermosphere system changes greatly within the eclipse shadow, due to the rapid reduction of solar irradiation.

MHD simulation of prominence eruption

A 3D MHD simulation of the eruption of a prominence-carrying coronal flux rope
Monday, August 6, 2018

Yuhong Fan and others carry out magnetohydrodynamic (MHD) simulations of the quasi-static evolution and eruption of a twisted coronal flux rope under a coronal streamer built up by an imposed flux emergence at the lower boundary.

Experimental testing of scattering polarization models

Broadband fractional polarization Q/I, U/I, and V/I
Wednesday, August 1, 2018

We realized a laboratory experiment to study the polarization of the Na I doublet at 589:3 nm, in the presence of a magnetic eld. The purpose of the experiment is to test the theory of scattering polarization for illumination conditions typical of astrophysical plasmas.

Measured performance of shadow-cast coated gratings for spectro-polarimetric applications

Measured vector efficiency of an echelle grating
Wednesday, August 1, 2018

Roberto Casini et al report on the measurements of the vector efficiency of a reflective blazed diffraction grating, which was specially coated in order to reduce the level of polarization in the diffracted light.

Solar physics from unconventional viewpoints

An overview of interesting vantage points, highlighting previous extra-Sun-Earth-line (extra-SEL) missions
Thursday, July 26, 2018

We explore new opportunities for solar physics that could be realized by future missions providing sustained observations from vantage points away from the Sun-Earth line.

Delores J. Knipp Designated an AMS Fellow

Dr. Delores J. Knipp

As part of their yearly awards and honors program, the American Meteorological Society (AMS) has recognized Dr. Delores J. Knipp as a Fellow.

Dr. Tanausú del Pino Alemán awarded 2018 ESPD Prize

Dr. Tanausú del Pino Alemán

Dr. Tanausú del Pino Alemán (Instituto de Astrofísica de Canarias, Tenerife, Spain) has been awarded the 2018 ESPD Early Career Researcher Prize for his ground breaking contributions in the field of theoretical solar spectropolarimetry.

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