-
Article
Processing Method Effects on Solar Diameter Measurements: Use of Data Gathered by the Solar Disk Sextant
To determine the apparent diameter of the Sun, it is first necessary to measure the shape of the intensity profile of the solar limb with an imaging optical system (hereafter denoted as a solar-limb profile)....
-
Article
High-Precision Measurements of the Solar Diameter and Oblateness by the Solar Disk Sextant (SDS) Experiment
We reduce and analyze, in a uniform way, all of the data obtained by the Solar Disk Sextant (SDS) experiment, concerning high-precision measurements of the solar radius and oblateness, in the bandwidth 590 {–}...
-
Article
The Prototype RISE-PSPT Instrument Operating in Rome
The breadboard prototype of the PSPT (Precision Solar Photometric Telescope), built by NSO at Sacramento Peak, has been operating in Rome since February 1996 to test observing procedures and future network ope...
-
Chapter and Conference Paper
The Prototype RISE-PSPT Instrument Operating in Rome
The breadboard prototype of the PSPT (Precision Solar Photometric Telescope), built by NSO at Sacramento Peak, has been operating in Rome since February 1996 to test observing procedures and future network ope...
-
Article
The solar-image acquisition system at Tor Vergata university
We describe an image acquisition system realized as a part of an apparatus built in collaboration with the Arcetri Astrophysical Observatory in Florence designed to record high-spectral-resolution solar images...
-
Article
A study of the solar atmosphere with high-resolution spectroscopic images: Acquisition system
In this note we describe the image acquisition system realized as a part of an experiment designed to record high-spectral-resolution solar images in the visible part of the spectrum. The system is based on a ...
-
Article
High-resolution spectroscopic imaging of the Sun with a universal birefringent filter and a Fabry-Perot Interferometer
We describe an optical device consisting of a Universal Birefringent Filter and a Fabry-Perot interferometer used in tandem to obtain monochromatic images of the Sun in the visible spectrum (between 4200 and 7...
-
Article
A spherical harmonics filter for solar oscillations research
A scheme, based on the expansion of solar oscillations into spherical harmonics, for the identification of sectorial modes of intermediate degree in the interval 3 < l < 20 is presented. In this range, the freque...
-
Article
Ion flow at comet Halley
The three-dimensional positive ion analyser aboard the Giotto spacecraft has been used to study the interaction between protons and α-particles in the solar wind and positive ions from comet Halley. Although the ...
-
Article
Geomagnetic turbulence at L'Aquila (Italy): Preliminary results of a variance analysis
Some preliminary measurements of the geomagnetic turbulence at L'Aquila, in the range of frequency of micropulsations, have been conducted during November 1983. The 60 s variances of the horizontal components ...
-
Article
On the temperature of α-particles and heavy ions in the solar wind
The temperature of protons, α particles, silicon and iron ions in the solar wind have been determined analysing 140 energy spectra measured aboard the ISEE-2 spacecraft during 1978 and 1979. The data cover the...
-
Article
Preliminary measurements of geomagnetic micropulsations at L'Aquila, Italy
In this paper we present the data acquisition procedure and criteria which have been adopted at the new station for geomagnetic micropulsations at L'Aquila (Italy) and are currently under evaluation. In partic...
-
Article
A facility for measuring geomagnetic micropulsations at l'Aquila, Italy
The University of L'Aquila and the Istituto di Fisica dello Spazio Interplanetario, C.N.R. (Frascati), are jointly installing in the vicinity of the twon of L'Aquila a triaxial search coil magnetometer for the...
-
Article
Observation of oxygen-enriched plasma in the driving piston of a flare-generated shock wave
-
Article
Observations of backstreaming protons in the solar wind near the Earth's bow shock
Protons backstreaming in the solar wind, upstream of the Earth's bow shock, are frequently revealed by the plasma, experiment on board satellite ISEE 2. Preliminary results of a statistical analysis (based on ...
-
Article
Preliminary results from the solar wind experiment on the ISEE-2 satellite
The EGD plasma experiment, launched on board of the ISEE-2 spacecraft, is briefly described. Preliminary results concerning three bow shock crossings occurred in November 1977 are discussed. Our attention is f...
-
Chapter
Preliminary Results from the Solar Wind Experiment on the ISEE-2 Satellite
The EGD plasma experiment, launched on board of the ISEE-2 spacecraft, is briefly described. Preliminary results concerning three bow shock crossings occurred in November 1977 are discussed. Our attention is f...
-
Article
Observation of the polar cusps and of the high-latitude magnetopause with the European satellite HEOS-2
This article presents the observations of the polar cusps and of the magnetopause obtained in 1972 by the plasma experiment S 202 aboard the European satellite HEOS-2. The particular orbit chosen for this spac...
-
Article
Solar wind direction from HEOS 1 and Explorer 33 satellites
A description is given of the analysis of the solar wind angular data from the satellite HEOS 1 and a comparison is made with the data obtained by Explorer 33, in the period of time from January 1967 to April ...
-
Chapter and Conference Paper
Observation of Interplanetary Shocks on August 4, 1972
In this report we describe plasma and magnetic field observations performed by the European satellite HEOS 2 during a series of large interplanetary shocks, which overtook the spacecraft on August 4, 1972.
