The influence of geomagnetic activity on polar cap absorption.
Polar cap absorption riometer data compared for Thule, Greenland and College, Alaska for determining geomagnetic activity influence
POLAR CAP ABSORPTION↗
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Polar cap absorption on VLF emissions.
Polar cap absorption effect on polar VLF EMISSIONS used for analysis of solar proton events
POLAR CAP ABSORPTION↗
The polar cap absorption on July 7-10, 1966.
Polar cap absorption on July 1966, discussing solar flare, radio outburst, proton intensity, geomagnetic latitude, etc
SOLAR RADIATION↗
The influence of geomagnetic activity on polar cap absorption
Cosmic noise absorption data on polar cap analyzed for geomagnetic activity
NOISE SPECTRUM↗
The polar cap absorption on July 7-10, 1966
Time history analysis for polar cap absorption of solar flare in July, 1966
POLAR CAP ABSORPTION↗
Polar cap absorptions and associated solar terrestrial events throughout the 19th solar cycle
Polar cap absorption study of solar cycle variation in solar proton emissions from sun
Hakura, Y.↗
Analysis of polar cap absorption events. II - Time relation of major flares and rf emissions at centimeter wavelengths First quarterly report
Polar cap absorption analysis - time relation of major flares and radio frequency emissions at centimeter wavelengths
POLAR CAP ABSORPTION↗
Interplanetary magnetic field asymmetries and their effects on polar cap absorption events and forbush decreases.
Flare plasma cloud model with magnetic field asymmetry for solar-terrestrial system with reference to polar cap absorption and Forbush decrease
INTERPLANETARY MAGNETIC FIELD↗
Analysis of polar cap absorption events. I - Effect of solar and solar induced conditions prior to the PCA events Final report
Solar phenomena analysis associated with polar cap absorption events from solar flare protons for prediction space radiation conditions
SOLAR FLARE↗
Measurement of the effective electron loss rates in the D region during polar cap absorption events
Day and nighttime effective electron loss rate measurement in D region during polar cap absorption events, using rocket-borne spectrometers and Faraday rotation
Adams, G. W.↗
Analysis of polar cap absorption event 5 RF profiles, active solar regions and associated phenomena, requirements for a proton warning system
Polar cap absorption correlated with RF profiles active solar regions, and associated phenomena
Jonah, F. C.↗
Analysis of polar cap absorption events. 3 - Time relation of RF-H alpha maximum intensity for all cm bursts more than or equal to 500 times 10-22 W/m2c/s/-1 Quarterly report
Spectrum analysis of radio frequency emissions from polar cap absorption events
Jonah, F. C.↗
The polar-cap absorption on 7-10 July 1966.
Time history of July 7-10 1966 PCA event analyzed using 16 riometers and concurrent satellite observations of solar cosmic radiation
Hakura, Y.↗
Observations of the September 2, 1966 PCA event - Midday recovery in absorption
Balloon and riometer observations of polar cap absorption midday recovery
RIOMETER↗
Observations of the September 2, 1966 PCA event - Midday recovery in absorption.
Midday recovery in polar cap absorption event noting corresponding particle flux changes
Brown, R. R.↗
Rocket and satellite observations of energetic particles during P.C.A. events.
Properties of solar cosmic rays causing polar cap absorption measured with satellites
SPATIAL DISTRIBUTION↗
A triaxial electron detector
Triaxial electron detector for use in sounding rocket experiment to study polar cap absorption
POLAR CAP ABSORPTION↗
Post-flare effects in the lower ionosphere of middle latitudes
Beginning in the 1960s, records were made of noise from the region around the Polar Star on 29 MHz (Krivsky and Tlamicha, 1960) at the Ondrejov Observatory near Prague. Since the aerial characteristic was not too narrow, radio bursts were received of solar origin (of flares) at the noise level, SCNA effects (sudden cosmic noise absorption) at the time of intensive flare X-emission and in some rare cases, after large proton flares, small absorption effects of a few hours duration (Krivsky, 1969). These post-flare absorption effects in cosmic noise are evidently analogous with PCA effects (polar cap absorption) and are connected with ionospheric absorption of radio cosmic noise, caused by fast particles of subcosmic radiation. The recording of long term absorption effects after large particle flares at European midlatitudes was reported at the beginning of the 1960s. It was then usual to record radio cosmic noise with riometers at frequencies of about 18 MHz in the polar or subpolar regions in an effort to record PCA effects of subcosmic radiation (Hakura, 1968). An attempt was made to record the complex of emissions mentioned as well as the effects in a new frequency range (30 MHz), which did not agree with the ideas of the contemporaneous representatives of the Ionospheric Department of the Geophysical Institute in Prague. In recent years radio cosmic noise has been recorded at the Upice Observatory. These long term after flare effects of cosmic radio noise absorption (AF-CNA) at middle latitudes are reported to the geophysical and ionospheric community for the first time.
Krivsky, L.↗