NCAR

Xuguang Cai

Xugang Cai is a postdoctoral fellow II in the High Altitude Observatory at NCAR. He is working on the investigation of the thermosphere and ionosphere by GOLD satellite and numerical models (TIEGCM).

Quan Gan

Quan Gan received his PhD in space physics from Wuhan University. His research interests include, but are not limited to, the short-term variability in the ionosphere-thermosphere system driven by forcing from the sun, and the M-I coupling and waves from the lower atmosphere.

Space Weather Challenge & Forecasting Implications Of Rossby Waves

Graph depicting solar magnetic weather
Tuesday, March 31, 2020

Rossby waves arise in thin layers within fluid regions of stars and planets. These global wave-like patterns occur due to the variation in Coriolis forces with latitude. In the past several years observational evidence has indicated that there are also Rossby waves in the Sun.

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.

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

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