Observations Of Solar Activity Research Articles

La Posta Astrogeophysical Observatory

An overview is presented of the equipment and data acquisition procedures at La Posta Astrogeophysical Observatory, located in the mountains, east of San Diego, Calif. It is a solar observatory, focusing on solar flares and the effect of solar activity on earth. It makes daily radio and optical observations of solar activity. Radio transmission in the earth atmosphere is monitored with VLF and HF equipment. A magnetometer monitors the state of the geomagnetic field.

Apollo 17 cosmic-ray experiment - Interplanetary heavy nuclei of energies 0.05 to 5.0 MeV per atomic mass unit

view Abstract Citations (1) References (31) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Apollo 17 cosmic-ray experiment: interplanetary heavy nuclei of energies 0.05 to 5.0 MeV per atomic mass unit. Woods, R. T. ; Hart, H. R., Jr. ; Fleischer, R. L. Abstract Glass detectors were exposed to interplanetary heavy ions for 45.5 hr on the moon during Dec. 12 and 13, 1972. In the energy range 0.05-5.0 MeV per amu, the differential flux of iron-group nuclei was found to be a power-law spectrum of the form 1/E cubed. During the experiment, solar activity was low, as inferred from both ground-based observations of solar activity and satellite measurements of particles in interplanetary space. The Fe/alpha-ratio at about 1 MeV per amu was enhanced by a factor of about 10 above the solar ratio. A pair of detectors that were exposed in both the solar and antisolar directions gave identical spectral shapes, with the flux from the solar direction being twice that from the antisolar direction. Collectively, the observations of solar-related anisotropy and the 1/E cubed spectra, and the factor of about 10 enhancement in the Fe/alpha-ratio, imply strongly that these heavy ions are solar in origin. Publication: The Astrophysical Journal Pub Date: May 1975 DOI: 10.1086/153591 Bibcode: 1975ApJ...198..183W Keywords: Apollo 17 Flight; Cosmic Rays; Heavy Nuclei; Interplanetary Space; Solar Activity Effects; Corpuscular Radiation; Heavy Ions; Power Spectra; Spaceborne Astronomy; Space Radiation full text sources ADS |

Solar activity observations and predictions

Solar activity observations and predictions

Solar activity observations at Uccle and Humain stations

Solar activity observations at Uccle and Humain stations

PRELIMINARY OBSERVATIONS WITH THE STANFORD MICROWAVE INTERFEROMETER

The Stanford microwave interferometer is financed by the U.S. Air Force Office of Scientific Research under contract AF 18(603) -53 and is operated by the Stanford Radio Propagation Laboratory. Some eight persons, working under the direction of Dr. R. N. Bracewell, have carried out the design, construction, and current operation. The equipment is designed primarily for the observation of solar activity, which needs the highest possible resolution in both angle and time. At our wavelength range of 9 to 1 1 cm, the sun is by far the brightest celestial object, and it has also a moderate angular size. These circumstances permit observation with multiple antenna beams pointing in different directions without problems from confusion. These observations are achieved at moderate cost with a

59. Spectral observations of solar activity at metre wave-lengths

This paper summarizes some recent results obtained with the solar radio-spectroscope at Dapto (Sydney), which has been in operation since 1952. The basic instrument is a receiver which sweeps through the frequency range 40–240 Mc./s. every half a second. Each spectrum is displayed as an intensity-modulated line, and successive spectra are recorded photographically on continuously moving film to give a dynamic record of the spectrum.