In this study we investigate the spectral structure of Pc3–4 pulsations observed at low and midlatitudes. For this purpose, ground-based magnetometer data recorded at the MM100 stations in Europe and at two low latitude stations in South Africa were used. In addition, fluxgate magnetometer data from the CHAMP (CHAllenging Minisatellite Payload) low Earth orbit satellite were used. The results o...

Abstract Satellite-measured tidal magnetic signals are of growing importance. These fields mainly used to infer Earth’s mantle conductivity, but also derive changes in the oceanic heat content. We present a new Kalman filter-based method from satellite magnetometers: KALMAG. The method’s advantage is that it allows study precisely estimated posterior error covariance matrix. results simultaneou...

Machine learning (ML) is often viewed as a black-box regression technique that unable to provide considerable scientific insight. ML models are universal function approximators and - if used correctly can information related the ground-truth dataset for fitting. A benefit over parametric there no predefined basis functions limiting phenomena be modeled. In this work, we develop on three dataset...

[1] Atmospheric density accounts for the largest source of error for predicting low-Earth orbiting satellite positions. Relevant applications include catalog maintenance, collision avoidance, and mission design. In this paper we quantify density model errors due to density variability at submodel grid spatial scales. Densities in the 370--450 km height region inferred from accelerometer measure...

The International Geomagnetic Reference Field (IGRF) is updated every five years based on candidate model submissions by research institutions worldwide. In the call for the 11th generation of IGRF, candidates were requested for the definitive main field in 2005, the predicted main field in 2010, and the predicted secular variation from 2010 to 2015. The NOAA/NGDC candidate models for IGRF-11 w...

[1] The Constellation Observing System for Meteorology Ionosphere and Climate (COSMIC)/Formosa Satellite 3 (FORMOSAT-3) is a six-satellite radio occultation mission that was launched in mid-April, 2006. The close proximity of the COSMIC satellites provides a unique opportunity to estimate the precision of the radio occultation remote sensing technique from closely collocated occultations (<10 k...

[1] In this brief report, the interplay between meteorological and geomagnetic activity influences on the low-latitude ionosphere is studied. Specifically, the disruption of the dominant wave-4 longitudinal structure of the equatorial ionization anomaly (EIA) by geomagnetic storms is investigated in connection with a sequence of three coronal mass ejections in July 2004. Observations of in situ...

[1] The CHAMP satellite in its polar, low-Earth orbit (450 km altitude) is a suitable platform for studying F region currents. High precision magnetic field measurements are used to detect and characterize these upper ionospheric currents on the Earth’s nightside. A few examples are presented to illustrate the special features of the currents and a statistical study is performed on half a year ...

For objects in the low Earth orbit region, uncertainty atmospheric density estimation is an important source of prediction error, which critical for space traffic management activities such as satellite conjunction analysis. This paper investigates evolution error distribution presence uncertainties, are modeled using probabilistic machine learning techniques. The recently proposed “HASDM-ML,” ...

Large thermospheric neutral density enhancements in the cusp region have been examined for many years. The Challenging Minisatellite Payload (CHAMP) satellite example has enabled observations of perturbation, showing that it is mesoscale size and exists statistically over solar cycle timescales. Further studies examining relationship with magnetospheric energy input shown fine-scale Poynting fl...