Articles | Volume 20, issue 7
Ann. Geophys., 20, 953–956, 2002

Special issue: SPACE WEATHER

Ann. Geophys., 20, 953–956, 2002

  31 Jul 2002

31 Jul 2002

A solar cycle of spacecraft anomalies due to internal charging

G. L. Wrenn, D. J. Rodgers, and K. A. Ryden G. L. Wrenn et al.
  • QinetiQ, A8, Cody Technology Park, Farnborough, Hampshire, GU14 0LX, UK
  • Correspondence to: G. L. Wrenn
  • (

Abstract. It is important to appreciate how the morphology of internal charging of spacecraft systems, due to penetrating electrons, differs from that of the more common surface charging, due to electrons with lower energy. A specific and recurrent anomaly on a geostationary communication satellite has been tracked for ten years so that solar cycle and seasonal dependencies can be clearly established. Concurrent measurements of sunspot number, solar wind speed and 2-day >2 MeV electron fluence are presented to highlight pertinent space weather relationships, and the importance of understanding the complex particle interaction processes involved.

Key words. Magnetospheric physics (energetic particles; trapped; solar wind – magnetosphere interactions) – space plasma physics (spacecraft sheaths, wakes, charging)

Special issue