NCAR High Altitude Observatory

Global Modeling of Equatorial Spread F with SAMI3/WACCM-X

Graphic image of the comparison of 135.6 nm emissions
Tuesday, June 2, 2020

We report the first results of a global ionosphere/thermosphere simulation study that self-consistently generates large-scale equatorial spread F (ESF) plasma bubbles in the post-sunset ionosphere.

Some thoughts on emission-line spectroscopy

Graphic image of intensity and polarization data surrounding the current sheet formed on Sept 10 2017
Tuesday, June 2, 2020

Philip Judge states that the interpretation of emission lines formed in large astrophysical plasmas such as the solar atmosphere faces many challenges. Relatively simple line-ratio estimates of physical parameters, while appealing, are heavily laden with assumptions.

Living With A Star Focus Team

Role of solar flows and magnetic field dynamics in active regions emergence and impact on heliospheric space weather

Saurav Aryal

Saurav Aryal is a visiting postdoc at HAO/NCAR. He received his PhD in Physics and Applied Physics from University of Massachusetts Lowell. He is currently a research associate at CU/LASP and a member of the NASA/GOLD team.

Introducing a Book— The Sun: A Very Short Introduction

Photographic image of the book cover to "The Sun: A Very Short Introduction" by Phil Judge

Philip Judge is a senior researcher in physics at the High Altitude Observatory. Education and outreach has been a major focus and passion during his scientific career. He has influenced and encouraged many young scientists to pursue careers in solar physics.

Simulated trends in ionosphere-thermosphere climate due to predicted main magnetic field changes from 2015 to 2065

Photograph of TEC in 2015
Friday, May 15, 2020

Summary or Abstract: The strength and structure of the Earth's magnetic field is gradually changing. These changes do not only affect the difference between the geographic and magnetic pole, which we have to consider when we hike in higher latitude regions.

Global-scale Measurements of the Limb and Disk (GOLD) Mission Implementation: Instrument Design and Early Flight Performance

Schematic of the sectional view of a GOLD spectroscopic imaging channel
Tuesday, May 12, 2020

The Global-scale Observations of the Limb and Disk (GOLD) is a NASA mission of opportunity designed to study how the Earth’s ionosphere-thermosphere system responds to geomagnetic storms, solar radiation and upward propagating tides on time scales as short as 30 minutes.

Haonan Wu

Haonan Wu is a visiting scientist in the High Altitude Observatory (HAO) at the National Center for Atmospheric Research (NCAR). Haonan graduated from the University of Science and Technology of China and obtained his BS degree in Space Physics in 2017. He joined Clemson University in Fall 2017.

Zihao Yang

Zihao Yang is a visiting scientist in the High Altitude Observatory (HAO) at the National Center for Atmospheric Research (NCAR). He is a PhD student at Peking University (PKU) in Beijing, China, where he is under the supervision of Prof. Hui Tian.

A distinct magnetic property of the inner penumbral boundary III. Analysis of simulated sunspots

Graphic image depicting radial profiles of continuum intensity
Friday, May 8, 2020

The analyses of sunspot observations revealed a fundamental magnetic property of the umbral boundary, the invariance of the vertical component of the magnetic field.


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