Solar Physics

HAO Outreach: 2020 Little Shop of Physics

Child participant at 2020 Little Shop of Physics doing hands-on activities

High Altitude Observatory (HAO) staff was invited by UCAR Science Education to present “Space Weather” to the public at the Little Shop of Physics 29th Annual Open House at the Colorado State University in Fort Collins.

Peter Gilman, HAO Senior Scientist Emeritus, receives AAS Legacy Fellowship

Peter Gilman, HAO Senior Scientist Emeritus

Peter Gilman, HAO Senior Scientist Emeritus, has been chosen by the American Astronomical Society to be a Legacy Fellow, or member of the first class of Fellows the AAS has chosen. He joins about 200 other members of the AAS, out of a total membership of about 9000, receiving this honor.

Interview with HAO's Anna Malanushenko

Photograph of Anna Malanushenko

I was born and raised on the Crimean peninsula on the northern coast of the Black Sea (Eastern Europe), an area currently disputed between Russia and Ukraine. In brief, I was born in a politically incorrect place.

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.

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