NCAR High Altitude Observatory

Interhemispheric Coupling Mechanisms in the Middle Atmosphere of WACCM6

Graphic depicting three WACCM realizations
Tuesday, January 7, 2020

Simulations with the Community Earth System Model 2 using the Whole Atmosphere Community Climate Model configuration, known as CESM2(WACCM6), show evidence of dynamical coupling from the high latitudes of the winter middle atmosphere to the tropics and the middle and high latitudes of the summer

Upper atmosphere radiance data assimilation: A feasibility study for GOLD far ultraviolet observations

Graph depicting accuracy of temperature estimates
Tuesday, January 7, 2020

Availability of far ultraviolet observations of Earth’s dayglow by the NASA Global-scale Observations of the Limb and Disk (GOLD) mission presents an unparalleled opportunity for upper atmosphere radiance data assimilation.

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.

Global-scale observations and modeling of far-ultraviolet airglow

Image depicting measurement, model simulation, and normalized differences
Monday, December 16, 2019

The NASA Global-scale Observations of the Limb and Disk (GOLD) instrument is an ultraviolet imager and spectrograph that observes light from the upper-atmosphere of the Earth, in order to infer quantities such as the composition and temperature of the thermosphere.

Temperature in a long-lived cavity

Graphic depicting Angstrom images of the cavity
Wednesday, December 11, 2019

Gibson et al. have analyzed a long-lived cavity observed from 17 March 2012 to 21 March 2012. For this cavity we applied a differential emission measure method to obtain both a temperature distribution and a value of the average temperature during all five observational days.

Simulation of Prompt Acceleration of Radiation Belt Electrons during the 16 July 2017 storm

Graph depicting a comparison of simulated and measured fluxes
Wednesday, December 11, 2019

Patel et al. observe that when an interplanetary shock launched from the Sun arrives at Earth, it compresses the dayside magnetic field and an impulse in electric and magnetic field propagates as a characteristic wave mode inside the magnetosphere toward the nightside.

Delores Knipp and Jiajia Liu Awarded Prestigious Medals during the European Space Weather Week

Graphic Image from European Space Weather Week

Every year during the European Space Weather Week (ESWW), three international medals are given in the field of space weather. The Kristian Birkeland Medal, the Baron Marcel Nicolet Medal and the Alexander Chizhevsky Medal.

Solar Flare Effects on 150-km Echoes Observed Over Jicamarca: WACCM-X Simulations

Figure of 150-km echoes and WACCM-X simulated electron densities during the solar flare
Thursday, October 31, 2019

A puzzling feature of the Earth’s equatorial upper atmosphere is the occurrence of enhanced VHF radar echoes near 150-km altitude. These so-called 150-km echoes have been observed for over 50-years, and occur nearly every day, making them a persistent feature of the equatorial ionosphere.

SAPS in the 2013 March 17 Storm Event: Initial Results from 1 the Coupled Magnetosphere-Ionosphere-Thermosphere Model

Figure of LTR simulation results of the ionospheric states
Thursday, October 31, 2019

Subauroral polarization stream (SAPS) are latitudinally narrow flow channels of large westward plasma drifts in the subauroral ionosphere.


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