Observations of Pi2 pulsations by the Wallops HF radar in association with substorm expansion

- Gjerloev, J. W., Greenwald, R. A., Waters, C. L., Takahashi, K., Sibeck, D., Oksavik, K, Barnes, R., Baker, J., Ruohoniemi, J. M.

Birkeland current system key parameters derived from Iridium observations: method and initial validation results

- Anderson, B. J., Takahashi, K., Kamei, T., Waters, C. L., Toth, B. A.

Detection of ultralow-frequency cavity modes using spacecraft data

- Waters, C. L., Takahashi, K., Lee, D.-H., Anderson, B. J.