NCAR

Space storms that go off-scale

Image of Hydrogen-α solar spectroheliogram

Terrestrial and space weather storm scales have a common shortcoming: The scales end at “5.” Nature of course doesn’t know this and sometimes produces a disturbance that is simply off the charts.

High cadence visible and infrared spectra of the Sun during eclipse

Graph of raw counts are plotted against wavelength in air for spectral lines
Friday, February 1, 2019

We study visible and infrared spectra, from 310 nm to 5 microns, obtained during the 21st August 2017 eclipse. The instruments were situated at Camp Wyoba (altitude 2402 m) on Casper Mountain, WY.

The Mid-latitude Thermospheric Dynamics from An Inter-hemispheric Prospective

Graph depicting Meridional and Zonal Winds
Monday, January 28, 2019

Using Fabry-Perot interferometers (FPI) at five mid-latitude stations (Boulder, Palmer, Millstone Hill, Mt. John, and Kelan) in both hemispheres, we examine the inter-hemispheric and seasonal variations of mid-latitude thermospheric dynamics.

First computer model to simulate a realistic solar flare

Image depicting a solar flare or cme

A team of scientists has, for the first time, used a single, cohesive computer model to simulate the entire life cycle of a solar flare.

Alfvénic Heating in the Cusp Ionosphere-Thermosphere

Graph showing volumetric Joule heating rates
Wednesday, December 19, 2018

The effect of electromagnetic variability on ionosphere-thermosphere heating in the low-altitude geomagnetic cusp is examined.

The Effect of Small-Scale Magnetic Structures on Inferred Solar Continuum Brightness

Average intensity of magnetic structures
Monday, December 3, 2018

Solar irradiance models indicate that irradiance variations are dominated by changes in disk-coverage of magnetic structures, whose brightness is thought to be determined by their size and average magnetic flux density.

The Extended Solar Cycle: Muddying the Waters of Solar/Stellar Dynamo Modeling Or Providing Crucial Observational

Graph depicting extended solar cycles
Monday, December 3, 2018

In 1844 Schwabe discovered that the number of sunspots increased and decreased over a period of about 11 years, that variation became known as the sunspot cycle.

The long-term trends of nocturnal mesopause temperature and altitude revealed by the Na lidar observations between 1990 and 2018 at mid-latitude

Graph showing WACCM-X (2.0) simulated summer temperature profiles of year 1974 and year 2003
Sunday, December 2, 2018

The nighttime mesopause, marking the boundary of mesosphere and thermosphere and having the coldest atmospheric temperature, is formed mainly by the combination of radiative cooling by CO2, and the adiabatic flow in the Mesosphere and Lower Thermosphere.

Pitch angle scattering of energetic electrons by bursty bulk flows (BBFs)

Pitch angle scattering of electrons in high resolution LFM fields
Tuesday, November 13, 2018

Mary Hudson and others have studied field line curvature scattering by the magnetic field structure associated with Bursty Bulk Flows (BBFs), using simulated output fields from the Lyon‐Fedder‐Mobarry (LFM) global magnetohydrodynamic (MHD) code for specified solar wind input.

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