ISSN:0148-0227    

DOI:10.1029/JZ063i001p00248-01

年代:1958

数据来源: WILEY

ISSN:0148-0227    

DOI:10.1029/JZ063i001p00249

年代:1958

数据来源: WILEY

ISSN:0148-0227    

DOI:10.1029/JZ063i001p00253-05

年代:1958

数据来源: WILEY

ISSN:0148-0227    

DOI:10.1029/JZ063i001p00254-05

年代:1958

数据来源: WILEY

ISSN:0148-0227    

DOI:10.1029/JZ063i001p00255-03

年代:1958

数据来源: WILEY

ISSN:0148-0227    

DOI:10.1029/JZ063i001p00257

年代:1958

数据来源: WILEY

摘要:

In the course of an investigation designed to explore different aspects of a possible connection between tropospheric and ionospheric changes as indicated by a previous study,1an interesting effect was noted.During 1954 and 1955, four hurricanes—Hazel (1954), and Connie, Diane, and lone (1955)—came close to Washington, D.C., for which meteorological and geophysical data were analyzed. Figure 1 shows the smoothed paths of these hurricanes according to the U.S. Weather Bureau Hurricane Tracking Cha

ISSN:0148-0227    

DOI:10.1029/JZ063i001p00265

年代:1958

数据来源: WILEY

摘要:

Several rocket‐borne magnetometers were flown recently near the geomagnetic equator. The record from one of these flights, made at 161° west longitude and 00° latitude, on 18 October 1957, is presented here as new evidence for the existence of electrical currents in the lower ionosphere.1,2The total‐field magnetometer used in the flights was of the nuclear free‐precession type.3The scalar magnitude of the earth's magnetic field is obtained in terms of the precession frequency (ƒ) of the proton, in this field, and the gyromagnetic ratio of the proton (γ);The magnetometer, developed in this laboratory for small rocket use, was a lightweight version of a balloon‐carried instrument, previously

ISSN:0148-0227    

DOI:10.1029/JZ063i001p00270

年代:1958

数据来源: WILEY

摘要:

Suggestions have been made by Friedman and Chubb1that sudden ionospheric disturbances may be due to an increase in the soft X‐ray flux penetrating to the tower ionosphere, rather than to an increase in the intensity of Lyman‐α radiation. These workers and their colleagues2have shown that during a small solar flare, which did not produce a detectable radio fade‐out, an increase in soft X‐radiation occurred above 75‐km height. In estimating the intensities at various wavelengths necessary to produce extra ionization, Friedman and Chubb have used values of height derived from low‐frequency radio observations, mostly of sudden phase anomalies.3It is the purpose of this note to present evidence obtained from medium‐frequency observations of the condition of the lower ionosphere durin

ISSN:0148-0227    

DOI:10.1029/JZ063i001p00273

年代:1958

数据来源: WILEY