Earth Potential Electrodes in Permafrost and Tundra

Introduction : During the past two years, the authors installed a number of electrodes in the permafrost and tundra area of Point Barrow to obtain earth potential data. As ground temperatures decreased during the winter, the resistances of the first set of electrodes increased by several orders of magnitude and thus became useless. A second set of electrodes, with sodium chloride incorporated in the fill, proved entirely adequate for recording earth potentials. The installations and procedure for determining electrode resistances are described herein. Electrode resistance data versus time and ground temperatures are also presented.Ye

Rapid Fluctuations in Earth-Currents at College

An unusual type of earth-current variation is regularly observed in the College records. The phenomena consist of more or less regular fluctuations with range from a few mv/km to more than 1000 mv/km, and periods ranging upwards from 6 seconds. The fluctuations may continue from a few minutes to several hours. They have a strong diurnal variation at College with a broad maximum at 0600 local time. The fluctuations also occur at a site about 100 km southeast of College, but are not observed at Barrow« Thus these rapid fluctuations display characteristics quite different from the previously classified magnetic and earth-current continuous pulsations, pc's, and train pulsations, pt's. Special equipment was devised to count and record the period of the fluctuations on a continuous basis. Typical rapid, fluctuation, traces.and charts showing their activity patterns are presented.This research is sponsored by the Geophysics Research Directorate, Air Force Cambridge Research Center, Air Research and Development Command under Contract No. AF 19(604)-3075 and by a grant from the National Science Foundation.Abstract -- Introduction -- Equipment : Geographic location of electrode field ; Stray electric fields ; Electrodes ; Lines ; Recorders ; Cycle counting equipment -- Records and Scaling : Rapid fluctuation records ; Rapid fluctuation at College - selected days ; Rapid fluctuation activity - February 1958 -- Diurnal variation in rapid fluctuation -- Diurnal variation in amplitude and frequency activity ; Rapid fluctuation frequency and period ; Rapid fluctuations at College and at Barrow -- Discussion : Comparison of earth-current rapid fluctuations with geomagnetic pulsations ; Comparison with other earth-current pulsation studies ; Diurnal Variation in amplitude and fluctuation frequency activity at College ; Generation of earth-current rapid fluctuation -- Summary -- Bibliography -- FiguresYe

Earth Current Activity at College, Alaska, July 1959

This report presents College N-S earth current records for the month of July 1959. The scale of 1 inch per hour permits detailed scaling directly from the reproductions in the report. Scalings of hourly range in amplitude and rapid fluctuation activity are given. The amplitude scalings are also presented as curves together with average curves for a period of several years to show the relative magnitudes of the July 1959 activity. The earth current always displays much more pronounced fine structure than the corresponding geomagnetic activity.Scientific Report No. 4 -- Contract No. AF 19(604)-3075 -- June 15, 1960 -- Geophysics Research Directorate Air Force Cambridge Research Center Air Research and Development Command United States Air Force Bedford, MassachusettsYe

Polar Ionospheric Research

Defines the ionsphere and describes its three horizontal layers or regions, distinguished by physical characteristics and ionization processes: as quiet D, E and F regions and as disturbed D, E and F regions when there is a disturbed sun (sunspot magma). Representative research techniques are characterized: all-sky camera, auroral spectroscopy, ionosonde, riometer, VHF forward scatter, auroral radar, whistlers, balloons and rockets. Some of the research problems are: the magnetospheric model, auroral theory, and the polar substorm. Programs needed include routine recording, a polar meridian net and experiments utilizing satellites and rockets, all of which can use support of the Naval Arctic Research Laboratory at Barrow, Alaska

High latitude geophysical data, October-December 1966

Geophysical data related to polar ionospheric activit

High latitude geophysical data

High latitude geophysical data on cosmic noise, and north-south telluric current activities over Alask

High latitude geophysical data, July-September 1966

High latitude graphical and tabular geophysical data of ionospheric activit

A Transport Analysis of the BEEM Spectroscopy of Au/Si Schottky Barriers

A systematic transport study of the ballistic electron emission microscopy (BEEM) of Au/Si(100) and Au/Si(111) Schottky barriers for different thicknesses of the metal layer and different temperatures is presented. It is shown that the existing experimental data are compatible with a recently predicted bandstructure-induced non-forward electron propagation through the Au(111) layer.Comment: 5 pages, Latex-APS, 1 postscript figure, http://www.icmm.csic.es/Pandres/pedro.htm. Phys. Stat. Sol. (b) (to appear), HCIS-10 Conf, Berlin 199

High latitude geophysical data, october - december, 1964

High altitude data on polar ionospheric activity, and cosmic noise leve