HAO

NCAR High Altitude Observatory

About the Mauna Loa Solar Observatory

The Mauna Loa Solar Observatory (MLSO) occupies part of the NOAA Mauna Loa research site located on the flank of Mauna Loa at an elevation of 3440 meters on the island of Hawaii. It is operated by the High Altitude Observatory, a division of the National Center for Atmospheric Research, which is located in Boulder, Colorado.

Medium-scale thermosphere perturbations in the bottomside F region in tropical regions

Graphic image of global distribution of gravity wave activity
Saturday, July 1, 2017

Thermospheric gravity waves in the bottomside F region have been proposed to play a key role in the generation of equatorial plasma bubbles (EPB). However, direct observations of such waves have been lacking.

Medium-scale thermosphere perturbations in the bottomside F region in tropical regions

Graphic image of global distribution of gravity wave activity
Saturday, July 1, 2017

Thermospheric gravity waves in the bottomside F region have been proposed to play a key role in the generation of equatorial plasma bubbles (EPB). However, direct observations of such waves have been lacking.

Explicit Form of the Radiative and Collisional Branching Ratios in Polarized Radiation Transport with Coherent Scattering

Schematic diagram showing the polarized radiation transfer in a Lambda-type atomic transition
Tuesday, October 17, 2017

We consider the vector emissivity of the polarized radiation transfer in a Lambda-type atomic transition, which we recently proposed in order to account for both CRD and PRD contributions to the scattered radiation.

Convolutional Neural Networks for Predicting the strength of the Near-Earth Magnetic Field Caused by Interplanetary Coronal Mass Ejections

Image depicting examples of various initial GLOW configurations
Thursday, July 9, 2020

In this paper, regression-based deep convolutional neural networks (CNN), with 12 layers, are developed for predicting the maximal amplitude of the southward component of the near-Earth magnetic field from a passing interplanetary coronal mass ejection (ICME).

A Rare Transit of Venus

Graphic image of individual frames from the movie showing Venus' transit

A coronagraph instrument at the Mauna Loa Solar Observatory on Hawai’i is used by a team of two scientists to record the rare transit of Venus across the Sun's corona.

Responses of the Thermosphere and Ionosphere System to Concurrent Solar Flares and Geomagnetic Storms

Graphic depicting simulated vertical E x B drift velocity
Wednesday, July 1, 2020

We conducted numerical simulations to examine dayside thermosphere and ionosphere responses to concurrent solar flares and a geomagnetic storm during September 6th – September 11th, 2017, as well as the interplay of flare and storm effects.

On the Cores of Resonance Lines Formed in the Sun's Chromosphere

Graphic image depicting a comparison of 1D and 3D calculations
Wednesday, July 1, 2020

We re-examine a 50+ year-old problem of deep central reversals predicted for strong solar spectral lines, in contrast to the smaller reversals seen in observations.

Pauline Dredger

Pauline Dredger is currently conducting research in the High Altitude Observatory at NCAR. She is a graduate student in the Department of Physics at University of Texas at Arlington.

Bhishek Manek

Bhishek Manek is a visiting scientist in the High Altitude Observatory (HAO) at the National Center for Atmospheric Research (NCAR). Bhishek is from the Applied Mathematics department at the University of California Santa Cruz (UCSC), where he is a Ph.D. candidate under the supervision of Prof.

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