NCAR High Altitude Observatory

Thermal Properties of Coronal Cavities

Graph depicting temperature of cavities and surrounding streamers
Tuesday, March 31, 2020

We have analyzed 33 cavities observed between 2012 and 2018, from solar activity maximum to minimum. For each cavity we applied a differential emission measure method to obtain both a temperature distribution and a value of the average temperature.

Opposite Polarity Magnetic Fields and Convective Downflows in a Simulated Sunspot Penumbra

Graphic image of opposite polarity magnetic fields
Tuesday, March 31, 2020

Recent numerical simulations and observations of sunspots show a significant amount of opposite polarity magnetic fields within the sunspot penumbra. Most of the opposite polarity fields are associated with convective downflows.

Large-scale ionospheric disturbances during the 17 March 2015 storm: A model-data comparative study

Graphic image of publication figure
Tuesday, March 24, 2020

Storm-induced ionospheric density variations are a major concern of near-Earth space environment as they could drastically disrupt satellite navigation and telecommunication systems.

Quiet-time Day-to-day Variability of Equatorial Vertical E×B Drift from Atmosphere Perturbations at Dawn

Graphic image of variability vertical ExB drift
Friday, March 20, 2020

The ionosphere is different from one day to the next, even under geomagnetic and solar quiet condition. The vertical E×B drift at the geomagnetic equator is a key parameter that influences the state of the ionosphere and atmosphere.

Tanausú del Pino Alemán

Tanausú del Pino Alemán has a PhD in Physics from La Laguna University and the IAC. He is an expert in the applications of the quantum theory of spectral line polarization for the inference of solar magnetic fields.

Mausumi Dikpati Interviewed Live by Astronomy & Space

Photograph of Mausumi Dikpati, senior scientist at HAO

Mausumi Dikpati is a senior scientist at HAO. She studies the dynamics between Rossby waves and solar activity such as flares and coronal mass ejections (CMEs).

Daniela Lacatus

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.


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