Paper - The Tropical Anomaly 3

Continuous and regional measurements of total electron content (TEC) over the Americas have revealed that quite frequently the largest TEC values reside over Central America. These unexpected and anomalous TEC values have not been reported before. They are observed during the June solstice afternoon hours, last for a few hours, are constrained to regions of eastward magnetic declination and occur at magnetic latitudes poleward of 20°. During the December solstice, similar TEC enhancements are seen over the southern coast of Brazil, also poleward of 20°, but in a region where the declination is westward. It is proposed and demonstrated using a physics-based model of the low-latitude ionosphere, that the TEC enhancements are produced by the neutral winds blowing at longitudes where the Earth’s magnetic declination is different from zero. Due to their anomalous character, the TEC enhancements have been designated as the tropical anomaly. This is the URL for "mypage": <a href="{% url 'myapp:mypage' %}">Click here</a>

April 4, 2016

JRO organize first ionosonde school 28

The goal of the first ionosonde school is to provide the necessary information to the students. The goal of the first ionosonde school. The goal of the first ionosonde school is to provide the.

August 11, 2015

Near-Realtime Plots 61


June 25, 2015

Second LISN workshop 18

The second LISN workshop was held at INPE Brazil The second LISN workshop was held at INPE Brazil The second LISN workshop was held at INPE Brazil The second LISN workshop was held at INPE Brazil

March 3, 2015

LISN Magnetometer in Argentina 20

Bajo un convenio de cooperación entre el IGP y el Complejo Astronómico El Leoncito (CASLEO), se instaló en este lugar el segundo magnetómetro construido —en el Radio Observatorio de Jicamarca (ROJ)— para el proyecto LISN.

August 10, 2014

LISN implements technique of monumentation at GPS stations 25

On April, LISN implemented a variant of the technique known as monumentation at the GPS station in Ancon Observatory. This work consisted in the assembly of a metallic structure to allocate the GPS antennas, with features of stability and mechanical rigidity that will allow data acquisition for geodetic applications.

August 27, 2013

LISN: operational stage 2

Low Latitude Ionospheric Sensor Network – LISN is created with the purpose of study of the high equatorial atmosphere, for which will be installed a set of geophysical instruments in the region of South America. Being approximately 50 stations of GPS, installed in diverse countries of the continent South American; 5 magnetometers stations and 5 ionosondes stations, installed throughout the 70ºW meridian line in South America. (see bulletin Año 1- No 6). LISN is development in three main stages: stage 1, administration of informatic and network to monitoring the distributed observatory; stage 2, the operational stage, consist in the installation of the geophysical stations; and the stage 3, investigation, that consist to study the high atmosphere, considering the diagnosis and forecast of ionospheres process using a data assimilation System, connected to numerical model that will be simulate this process. The first stage of the Project, administrative implementation of the informatic system for the monitoring of the distributed observatory from the central Server was finalized in 2006 year and the results is showing in the web page of the link ( That web page show in the graphic form the temporal distribution of the TEC (Total Electron Contain, for 4 GPS’s stations, in real time at each hour of observation, also the user have the option to access that data in RINEX format for 24 hours. The GPS’s stations are: Bogota in Colombia, Cuba in Brazil, Ancon in Peru, and Antofagasta in Chile. In the same way, have available the diagrams of temporal distribuition of TEC and data observation in RINEX format for 20 stations of the red RBMC (rede Brasileira de Monitoramento Continuo) of Brazil.

April 2, 2010