Magnetometer System for Studies of the Equatorial Electrojet and Micropulsations in Equatorial Regions.

Abstract

A magnetometer system for unmanned long-term observation in equatorial regions has been developed and is available. Because this system is designed for the study of both micropulsations and the equatorial electrojet, it must have accurate timing, high sensitivity, a wide measurement range, and a long-term recording capability. The equatorial regions we are interested in are quite remote far from sufficient technical and human support, and the breakdown of a public power supply is frequent. So, the system is requested to be compact and work successively in low power consumption with battery backup under equatorial environments. This system is successfully developed in low cost compared with commercial magnetometer system with similar properties.

Signatures of traveling convection vortices in ground magnetograms under the equatorial electrojet

“…For comparison, we will present observations from low‐latitude stations at similar local times in Brazil. The National Institute of Space Research (INPE) in São Jose dos Campos, São Paulo, Brazil, and Kyushu University in Fukuoka, Japan, have jointly and intermittantly operated high time (3 s) and amplitude (0.05 nT) resolution, low‐noise, three‐component fluxgate magnetometers at three stations (Belem, São Luis, and Teresina) under the equatorial electrojet in Brazil since 1991 [ Tachihara et al , 1996; Saka et al , 1996]. To determine the longitudinal extent of the low‐latitude signatures, we will also present 3‐s time resolution observations from Guam, Peradenia, Mokolo, Alcantara, and Ancon, all operated by K. Yumoto of the University of Kyushu in Japan.…”

Pressure‐pulse interaction with the magnetosphere and ionosphere

“…To demonstrate that no TCVs were observed postnoon, we will present Greenland [ Wilhjelm and Friis‐Christensen , 1976] ground magnetometer observations at 20 s time resolution. Finally, to track the motion of corresponding signatures through equatorial ground magnetograms, we will present Equatorial Magnetometer network [ Tachihara et al , 1996] observations at 3 s time resolution. Table 1 lists the locations of the ground magnetometers used in this study, together with the times when they pass through magnetic local noon.…”

Characteristics of Pi 2 magnetic pulsations observed at the CPMN stations: A review of the STEP results

“…• magnetic meridian (MM) (Yumoto and the 210 • MM Magnetic Observation Group, 1996) and the magnetic equator (Tachihara et al, 1996) as shown in Fig. 1, it is now possible to investigate global characteristics of Pi 2 pulsations and one-to-one correspondence between Pi 2s and substorm onsets (i.e.…”