• Comparison of high latitude electron density profiles obtained with the GPS radio occultation technique and EISCAT measurements. 

      Stolle, C.; Rietveld, Michael T.; Jakowski, N.; Schlegel, K: (Journal article; Peer reviewed; Tidsskriftartikkel, 2004)
      To obtain a comprehensive view on high latitude processes by applying different observation techniques, the SIRCUS campaign was initiated in 2001/2002. This paper compares electron density profiles derived from CHAMP radio occultation data and those measured with the EISCAT facility. Since ionospheric profiling with the help of space-based received GPS is a relatively new technique, validations with ...
    • Solved and unsolved riddles about low-latitude daytime valley region plasma waves and 150-km echoes 

      Chau, J.L.; Longley, W.J.; Reyes, P.M.; Pedatella, N.M.; Otsuka, Y.; Stolle, C.; Liu, H.; England, S.L.; Vierinen, Juha; Milla, M.A.; Hysell, D.L.; Oppenheim, M.M.; Patra, A.; Lehmacher, G.; Kudeki, E. (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-27)
      The Earth’s atmosphere near both the geographic and magnetic equators and at altitudes between 120 and 200 km is called the low-latitude valley region (LLVR) and is among the least understood regions of the ionosphere/thermosphere due to its complex interplay of neutral dynamics, electrodynamics, and photochemistry. Radar studies of the region have revealed puzzling daytime echoes scattered from ...