Ricky Egeland

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.

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.

Waldmeier Effect in Stellar Cycles

Graph depicting the second Waldmeier effect-WE2
Tuesday, October 8, 2019

One of the most robust features of the solar magnetic cycle is that the stronger cycles rise faster than the weaker ones. This is popularly known as the Waldmeier Effect, which is known for more than 100 years.

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.

Ricky Egeland developed sunstardb

50-year time series of the S-index

During his thesis work at HAO, Newkirk Fellow Ricky Egeland developed a solar-stellar database called sunstardb.

AAS Nova Highlights Article About Measuring the Suns Activity On The Scale Used For The Stars

Cycle 23 data and cycle shape model fits
Wednesday, November 30, 2016

The American Astronomical Society (AAS) NOVA website is highlighting a recent publication by HAO's Ricky Egeland (graduate research fellow) titled The Mount Wilson Observatory S-Index of the Sun. The new paper has been accepted for publication in the Astrophysical Journal.

Ricky Egeland

Ricky is a Project Scientist I in the High Altitude Observatory at NCAR. His primary research interests are to study the magnetic cycles of sun-like stars.

Stellar Evidence that the Sun May be in Transition

chromospheric activity and rotation in field dwarfs and subgiants
Friday, July 1, 2016

The study of Sun-like stars helps us to put the Sun in context. HAO Newkirk Fellow Ricky Egeland has co-authored a new publication with Space Science Institute scientist Travis Metcalfe and Carnegie Fellow Jennifer van Saders.

SOLAR COUSIN PRESENTS A MYSTERY FOR THE DYNAMO

HD30495 Figure 1
Thursday, December 3, 2015

What might happen to the well-known 11-year solar cycle if the Sun were spun up to rotate more than two times faster? To investigate such questions of the dependence of the Sun's internal dynamo on parameters such as rotation we must look to other stars with different physical conditions.

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