Publications
Geomagnetism publications.
Filter Total Items: 414
Lightning‐driven electric fields measured in the lower ionosphere: Implications for transient luminous events
Transient luminous events above thunderstorms such as sprites, halos, and elves require large electric fields in the lower ionosphere. Yet very few in situ measurements in this region have been successfully accomplished, since it is typically too low in altitude for rockets and satellites and too high for balloons. In this article, we present some rare examples of lightning‐driven electric field c
Authors
Jeremy N. Thomas, Benjamin H. Barnum, Erin Lay, Robert H. Holzworth, Mengu Cho, Michael C. Kelley
Rare measurements of a sprite with halo event driven by a negative lightning discharge over Argentina
As part of a collaborative campaign to investigate Transient Lummous Events (TLEs) over South America, coordinated optical, ELF/VLF, and lightning measurements were made of a mesoscale thunderstorm observed on February 22-23, 2006 over northern Argentina that produced 445 TLEs within a ???6 hour period. Here, we report comprehensive measurements of one of these events, a sprite with halo that was
Authors
M.J. Taylor, M.A. Bailey, P.D. Pautet, S.A. Cummer, N. Jaugey, J.N. Thomas, N.N. Solorzano, Sabbas F. Sao, R.H. Holzworth, O. Pinto, N.J. Schuch
Magnetic monitoring of earth and space
For centuries, navigators of the world’s oceans have been familiar with an effect of Earth’s magnetic field: It imparts a directional preference to the needle of a compass. Although in some settings magnetic orientation remains important, the modern science of geomagnetismhas emerged from its romantic nautical origins and developed into a subject of great depth and diversity. The geomagnetic field
Authors
Jeffrey J. Love
Statistical modeling of storm level Kp occurrences: Solar cycle modulation
We consider the nonstationary, statistical modeling of the occurrence in time of large Kp geomagnetic storms over the course of multiple solar cycles. Previous work showed that wait times between storms can be represented by an exponential density function, consistent with the realization of a Poisson process. Here we also assume a Poisson process, but to account for solar cycle modulation of stor
Authors
Jeffrey J. Love, K.J. Remick, David M. Perkins
The contribution of geomagnetic observatories and magnetic models to the study of secular variation and jerks in Antarctica
Some of the most interesting features of the geomagnetic field and its time variations are displayed in polar
areas. Observatory monthly means usually provide an excellent opportunity to study the temporal changes of the
magnetic field at a given location. Unfortunately, on the Antarctic continent the distribution of the permanent ground-
based observatories does not permit a uniform coverage of t
Authors
A. Meloni, L. Cafarella, P. De Michelis, R. Tozzi
Statistical methods for paleovector analysis
Our concern is with the statistical description of paleomagnetic vectors and the estimation of their mean and variance. These vectors may come from a number of different rock units or archeological samples, representing a range of acquisition times, and be useful for studies of the mean paleomagnetic field and paleosecular variation; alternatively, the vectors may come from individual measurements
Authors
Jeffrey J. Love
Principal component analysis in paleomagnetism
When studying the mean and variance of paleomagnetic data it is a common practice to employ principal component analysis (Jolliffe, 2002). The theory of this method is related to the mathematics quantifying the moment of inertia of a set of particles of mass about some reference point of interest. For the purposes of data analysis, principal component analysis was first promoted by Pearson (1901)
Authors
Jeffrey J. Love
Observatories, program in USA
The Geomagnetism Program of the US Geological Survey has, for over a century now, monitored the Earth's magnetic field through a network of magnetic observatories and conducted scientific analysis on the data collected. The program traces its origins to the Reorganization Act of 1843, in which Congress authorized the creation of a coastal survey agency, as part of the Treasury Department, that was
Authors
Jeffrey J. Love, J.B. Townshend
Magnetic indices
Magnetic indices are simple measures of magnetic activity that occurs, typically, over periods of time of less than a few hours and which is recorded by magnetometers at ground‐based observatories (Mayaud, 1980; Rangarajan, 1989; McPherron, 1995). The variations that indices measure have their origin in the Earth's ionosphere and magnetosphere. Some indices having been designed specifically to qua
Authors
Jeffrey J. Love, K.J. Remick
Close temporal correspondence between geomagnetic anomalies and earthquakes during the 2002-2003 eruption of Etna volcano
The early stages of the 2002-2003 lateral eruption at Mount Etna were accompanied by slow changes (over some hours) and some rapid step offsets in the local magnetic field. At five monitoring locations, the total magnetic field intensity has been measured using continuously operating Overhauser magnetometers at a sampling rate of 10 s. The very unique aspect of these observations is the close temp
Authors
G. Currenti, Negro C. Del, M. Johnston, Y. Sasai