HAO

NCAR High Altitude Observatory

Kevin Pham

Dr. Kevin Pham is a Postdoctoral Fellow in the High Altitude Observatory of the National Center for Atmospheric Research specializing in the magnetosphere and radiation belt precipitation.

Jing Liu

Jing Liu is a project scientist in the High Altitude Observatory at NCAR.

Outreach and Observing at Mauna Loa in Hawaii

Lisa Waters demonstrating magnetic fields and effects on the sun

Educational outreach is an important and rewarding part of an observer’s job at the Mauna Loa Solar Observatory (MLSO) site located on the flanks of Mauna Loa Mountain at an elevation of 3440 meters in the U.S. state of Hawai’i.

Temporal Variation of Solar Wind in Controlling Solar Wind‐Magnetosphere‐Ionosphere Energy Budget

Cross-correlation between Joule heating and the Epsilon function.
Thursday, September 13, 2018

Periodic oscillations associated with Alfven waves with periods ranging from several tens of minutes to several hours are commonly seen in the solar wind.

On the responses of mesosphere and lower thermosphere temperatures to geomagnetic storms at low and middle latitudes

Temporal Variations of Kp
Friday, September 14, 2018

Observations from lidars and satellites have shown that large temperature increases and decreases occur in the middle and low latitudes of the mesosphere and lower thermosphere (MLT) region during geomagnetic storms.

Instrument Calibration of the Interface Region Imaging Spectrograph (IRIS) Mission

 Schematic view of IRIS
Saturday, September 15, 2018

The Interface Region Imaging Spectrograph (IRIS) is a NASA Small Explorer mission that provides high-resolution spectra and images of the Sun in the 133–141 nm and 278–283 nm wavelength bands.

Jeur India Total Eclipse Jan 22, 1898 photos by photographer Henry Cousens

Angela O'Sullivan contacted the High Altitude Observatory in August 2017. She felt it important to share with us certain historical photographs taken by her Great Grandfather, Henry Cousens, during the Jeur India Total Eclipse, Jan 22, 1898. These photographs have been in the possession of M.

Storm-time Thermosphere Over Cooling: Impacts of Nitric Oxide, Solar EUV and Particle Precipitation

GOCE neutral density on dusk side
Tuesday, September 4, 2018

Some recent studies have revealed that the post-storm thermospheric mass density sometime drops below its pre-storm value. This phenomenon has been attributed to the over-cooling effect caused by enhanced infrared emissions from nitric oxide.

Recovery from Maunder-like Grand Minima in a Babcock–Leighton Solar Dynamo Model

Temporal variation of the smoothed sunspot number
Tuesday, September 4, 2018

The Sun occasionally goes through Maunder-like extended grand minima when its magnetic activity drops considerably from the normal activity level for several decades. Many possible theories have been proposed to explain the origin of these minima.

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