Julius Bartels

1899 – 1964

• Collection of geomagnetic planetary indices Kp and derived daily indices, Ap and Cp, for the years 1932 to 1961
• Ein Q-Index für die erdmagnetische Aktivität in viertelstündlichen Intervallen
• Geomagnetic data 1958 rapid variations
• Geomagnetic data 1960
• Geomagnetic data 1961, indices K and C
• Geomagnetic data 1962 indices K and C
• Geomagnetic data, 1962, rapid variations
• Geomagnetic K-indices, International Polar Year, August 1932 to August 1933
• Geophysics
• Geophysik
• Geophysik I / Geophysics I
• Geophysik II / Geophysics II