Solar Physics

Upper atmosphere radiance data assimilation: A feasibility study for GOLD far ultraviolet observations

Graph depicting accuracy of temperature estimates
Tuesday, January 7, 2020

Availability of far ultraviolet observations of Earth’s dayglow by the NASA Global-scale Observations of the Limb and Disk (GOLD) mission presents an unparalleled opportunity for upper atmosphere radiance data assimilation.

Sun-Like Stars Shed Light on Solar Climate Forcing

Seasonally averaged data for the CaII“S-index” and for the average magnitudes of the Strömgrenbplusy filters
Tuesday, January 7, 2020

Recently published, precise stellar photometry of 72 Sun-like stars obtained at the Fairborn Observatory between 1993 and 2017 is used to set limits on the solar forcing of Earth’s atmosphere of ±4.5 W m−2 since 1750.

Temperature in a long-lived cavity

Graphic depicting Angstrom images of the cavity
Wednesday, December 11, 2019

Gibson et al. have analyzed a long-lived cavity observed from 17 March 2012 to 21 March 2012. For this cavity we applied a differential emission measure method to obtain both a temperature distribution and a value of the average temperature during all five observational days.

Solar eclipse observations from the ground and air from 0.31 to 5.5 microns

Plot showing Spectra of the limb photosphere during the 21st August 2017 eclipse
Friday, March 29, 2019

We present spectra and broad-band polarized light data from a suite of instruments deployed during the 21st August 2017 total solar eclipse. Our goals were to survey solar spectra at thermal infrared wavelengths during eclipse, and to test new technology for measuring polarized coronal light.

Solar Flare and Geomagnetic Storm Effects on the Thermosphere and Ionosphere During 6–11 September 2017

Graphic plots depicting data from Swarm A and Swarm B satellites
Friday, March 29, 2019

The period of September 6 – 11, 2017 was an active period in which multiple solar flares and a major geomagnetic storm occurred. The two largest flares, an X9.3 and an X8.2 flares, were a disk flare and a limb flare, respectively.

Magnetic tsunami in the Sun triggers new space weather events in 2020

Image of global tachocline fluid top surface deformations

Most people have heard about tsunamis in the Earth’s oceans. Those occur when large masses of water get violently moved at the ocean floor, as a result of earthquakes or volcanic eruptions.

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.

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