High-speed solar-wind streams and geospace interactions

Distant tail behavior during high speed solar wind streams and magnetic storms

We have examined the ISEE 3 distant [ail data during three intense (Dst <-100 nT) magnetic storms and have identified the tail response to high-speed solar wind streams, interplanetary magnetic clouds, and near-Earth storms. The three storms have a peak Dst ranging from -150 to -220 nT and occur on January 9, February 4, and Augus: 8, 1983, During [he storm onsets, the fast solar wind and magne...

Predicting the arrival of high-speed solar wind streams at Earth using the STEREO Heliospheric Imagers

[1] High-speed solar wind streams modify the Earth’s geomagnetic environment, perturbing the ionosphere, modulating the flux of cosmic rays into the Earth atmosphere, and triggering substorms. Such activity can affect modern technological systems. To investigate the potential for predicting the arrival of such streams at Earth, images taken by the Heliospheric Imager (HI) on the STEREO-A spacec...

Changes in thermospheric temperature induced by high-speed solar wind streams

Periodic modulations in thermospheric composition by solar wind high speed streams

[1] SO/N2 ratios in the Earth’s thermosphere are measured by the Global Ultraviolet Imager (GUVI) on the TIMED satellite, and demonstrate strong 9 and 7 day oscillations in 2005 and 2006, respectively, that are well correlated with the solar wind speed and Kp index. This work builds on the recently discovered connection between rotating solar coronal holes and thermospheric mass density variati...

Are repetitive particle injections during high-speed solar wind streams classic substorms?

[1] The relation between substorm occurrences, energetic particle injections, and HighIntensity Long-Duration Continuous AE Activity (HILDCAA) events has been an issue. To understand their relationship, we use global auroral images from the Wideband Imaging Camera (WIC) on the Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) spacecraft to investigate auroral activity near the times ...