Radio Observatorio de Jicamarca - Instituto Geofísico del Perú

The routine absolute measurements were made by Domingo Rosales, Erick Vidaland Silvano Orihuela every 2 days, who also supervise the buildings and the equipment.Barringer Proton MagnetometerDI-Flux MagnetometerFigure 2 Absolute measurement instruments3.2 Barringer M-234 and RFP-523 Proton MagnetometerWe have a Barringer M-234 proton magnetometer with sensor installed to 23 metersNW direction from principal pillar E-2, and the second RFP-523 proton magnetometer withsensor installed to 32 meters NWW direction from principal pillar E-2.3.3 F pillar correctionsAt Huancayo Observatory D and I are measured on pillar No. E-2 in the AbsoluteHouse, and F is obtained from an Barringer proton magnetometer which is located at 23meters NW. Differences on F is measured at regular intervals to reduce the F gradientbetween proton magnetometer and the main pillar E-2:The values adopted for the year are:F MAIN PILLAR = F BARRIGER/RFP-523 +∆F BARRINGER/RFP-523 TO MAIN PILLAR (8)∆F BARRINGER TO MAIN PILLAR = -4.7 nT (9)∆F RFP-523 TO MAIN PILLAR = -1.5 nT (10)Apartado 130207, Lima 13, PerúTeléfonos (+51-1)317-2313 - Fax (+51-1)317-2312