scholarly journals Recent Development of the Nobeyama 17GHz Interferometer and Some Initial Results

1980 ◽  
Vol 86 ◽  
pp. 123-126
Author(s):  
Keizo Kai
Keyword(s):  
Spatial Resolution ◽  
Time Resolution ◽  
Solar Radio ◽  
High Time Resolution ◽  
The Sun ◽  
Radio Observatory ◽  
Time Calibration ◽  
Drift Scan ◽  
Time Variations ◽  
Initial Results

We have constructed a 17GHz interferometer of a multi-correlator type at the Nobeyama Solar Radio Observatory. Novel features of the new interferometer are summarized as (i) high time-resolution up to 0.8 s and (ii) “real-time” calibration of the whole system with an accuracy of ~ 2% for amplitudes and ~ 2° for phases. With the aid of these advantages over an interferometer of a conventional drift-scan type we are able to detect and follow rapid time variations of even a faint source (say, ~ 0.5 s.f.u.) on the Sun with a spatial resolution of ~ 40″. The interferometer has been put in operation since July 1978. We have recorded hundreds of bursts at 17GHz in a year including some tens of rapidly changing sources which would not precisely be measured so far. We present here some preliminary results of observations such as polarization structures of both rapidly changing and GRF bursts.

scholarly journals The Needs and Requirements from the Standpoint of the Ultraviolet Solar Observations

1968 ◽  
Vol 1 ◽  
pp. 538-540
Author(s):  
E.M. Reeves
Keyword(s):  
Spatial Resolution ◽  
Time Resolution ◽  
Solar Disk ◽  
Emission Lines ◽  
High Time Resolution ◽  
The Sun ◽  
X Ray ◽  
Solar Observations ◽  
Partial Success

Extending from the present to the early part of 1969 there are three Orbiting Solar Observatories to be launched, and these will all be capable of constructing spectroheliograms of the Sun in solar emission lines of the EUV and X-ray region. The recently launched and highly successful OSO-III has obtained EUV and X-ray spectra with high-time resolution, but without spatial resolution on the solar disk. The later OSO satellites will provide spatial resolution of 1′ of arc to 30″ of arc, and will provide the basis for the extension to even higher spatial resolution in the future.The comparatively short periods covered by these satellites, coupled with a real probability of only partial success, make it particularly important to obtain the fullest possible use of the data by implementing a complementary and simultaneous series of ground-based observations.

The Jupiter Radio Bursts

1974 ◽  
Vol 2 (5) ◽  
pp. 236-243 ◽  
Author(s):  
G. R. A. Ellis
Keyword(s):  
Time Resolution ◽  
Time Scale ◽  
Solar Radio ◽  
Complex Structure ◽  
High Time Resolution ◽  
The Sun ◽  
Radio Bursts ◽  
Solar Radio Bursts ◽  
Physical Scale ◽  
Dynamic Spectra

Like the strong non-thermal radio bursts from the solar corona and from the earth’s magnetosphere, the Jupiter radio bursts are characterized by their duration which may be from milliseconds to seconds, and by their complex structure on the frequency-time plane. In addition, they exhibit a variety of periodicities in their rate of occurrence, the primary one of which is associated with the rotation of Jupiter. The smaller physical scale of Jupiter compared with the Sun naturally leads to a much shorter time scale in the various radio phenomena and it is only recently that suitable equipment has become available to permit the detailed investigation of the dynamic spectra of the bursts with the necessary high time resolution of the order of 10–3 sec (Ellis 1973a,b,c). As in the case of the solar radio bursts, a number of distinct types of dynamic spectra are observed and they provide a convenient basis for classification.

Towards a microchannel-based X-ray detector with two-dimensional spatial and time resolution and high dynamic range

2015 ◽  
Vol 22 (5) ◽  
pp. 1202-1206 ◽  
Author(s):  
Bernhard W. Adams ◽  
Anil U. Mane ◽  
Jeffrey W. Elam ◽  
Razib Obaid ◽  
Matthew Wetstein ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Time Resolution ◽  
Dynamic Range ◽  
High Dynamic Range ◽  
High Time Resolution ◽  
Two Dimensional ◽  
X Ray ◽  
High Dynamic ◽  
Time Gating ◽  
Better Than

X-ray detectors that combine two-dimensional spatial resolution with a high time resolution are needed in numerous applications of synchrotron radiation. Most detectors with this combination of capabilities are based on semiconductor technology and are therefore limited in size. Furthermore, the time resolution is often realised through rapid time-gating of the acquisition, followed by a slower readout. Here, a detector technology is realised based on relatively inexpensive microchannel plates that uses GHz waveform sampling for a millimeter-scale spatial resolution and better than 100 ps time resolution. The technology is capable of continuous streaming of time- and location-tagged events at rates greater than 107events per cm2. Time-gating can be used for improved dynamic range.

Ultrafast Imaging of Materials: Exploring the Gap of Space and Time

MRS Bulletin ◽  
2006 ◽  
Vol 31 (8) ◽  
pp. 614-619 ◽  
Author(s):  
Wayne E. King ◽  
Michael Armstrong ◽  
Victor Malka ◽  
Bryan W. Reed ◽  
Antoine Rousse
Keyword(s):  
Spatial Resolution ◽  
Time Resolution ◽  
High Performance ◽  
New Technologies ◽  
Materials Science ◽  
High Time Resolution ◽  
Transient Phenomena ◽  
Ultrafast Imaging ◽  
Ultrafast Optical ◽  
Science Community

AbstractThe materials science community is poised to take advantage of new technologies that add unprecedented time resolution to already existing spatial-resolution capabilities. In the same way that chemists and biologists are using ultrafast optical, photon, and particle techniques to reveal transition pathways, materials scientists can expect to use variations of these methods to probe the most fundamental aspects of complex transient phenomena in materials. The combination of high-spatial-resolution imaging with high time resolution is critical because it enables the observation of specific phenomena that are important to developing fundamental understanding. Such a capability is also important because it enables experiments that are on the same time and length scales as recent high-performance computer simulations. This article describes several new techniques that have great potential for broader application in materials science, including electron, x-ray, and γ-ray imaging.

A solar radio spectrograph with high time resolution

Solar Physics ◽  
1972 ◽  
Vol 26 (2) ◽  
pp. 386-392 ◽  
Author(s):  
B. L. Gotwols ◽  
J. Phipps
Keyword(s):  
Time Resolution ◽  
Solar Radio ◽  
High Time ◽  
High Time Resolution

Comparing different types of solar flares with radio bursts detected by SMOS

2020 ◽  
Author(s):  
Manuel Flores Soriano ◽  
Consuelo Cid
Keyword(s):  
Space Weather ◽  
Early Warning ◽  
Solar Flares ◽  
Solar Radio ◽  
The Sun ◽  
Radio Bursts ◽  
Radio Observatory ◽  
X Ray ◽  
Different Types ◽  
Mass Ejection

<p>SMOS is an Earth observing satellite that is been adapted to provide full polarization observations of the Sun at 1.4 GHz 24 hours a day. Its solar radio observations from the last decade will be released to the community by the middle of this year. In this presentation we show the capabilities of SMOS as a solar radio observatory and compare some of the most relevant radio bursts with data from GOES, LASCO, SDO and RSTN. We show how SMOS responds to different kinds of solar flares depending on their x-ray flux, and the kind of mass ejection or solar dimming that they have produced, if any. In addition to this we also show the potential of SMOS as a space weather tool to monitor GNSS satellites signal fades and to provide an early warning of Earth-directed coronal mass ejections.</p>

scholarly journals A New Technology for Fast Two-Dimensional Detection of Proton Therapy Beams

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Robert Hollebeek ◽  
Mitch Newcomer ◽  
Godwin Mayers ◽  
Brian Delgado ◽  
Gaurav Shukla ◽  
...  
Keyword(s):  
Dose Rate ◽  
Spatial Resolution ◽  
Proton Therapy ◽  
Time Resolution ◽  
High Energy Physics ◽  
High Energy ◽  
High Dose Rate ◽  
High Dose ◽  
High Time Resolution ◽  
High Count

The Micromesh Gaseous Structure, or Micromegas, is a technology developed for high count-rate applications in high-energy physics experiments. Tests using a Micromegas chamber and specially designed amplifiers and readout electronics adapted to the requirements of the proton therapy environment and providing both excellent time and high spatial resolution are presented here. The device was irradiated at the Roberts Proton Therapy Center at the University of Pennsylvania. The system was operated with ionization gains between 10 and 200 and in low and intermediate dose-rate beams, and the digitized signal is found to be reproducible to 0.8%. Spatial resolution is determined to be 1.1 mm (1σ) with a 1 ms time resolution. We resolve the range modulator wheel rotational frequency and the thicknesses of its segments and show that this information can be quickly measured owing to the high time resolution of the system. Systems of this type will be extremely useful in future treatment methods involving beams that change rapidly in time and spatial position. The Micromegas design resolves the high dose rate within a proton Bragg peak, and measurements agree with Geant4 simulations to within 5%.

Fast Drift Bursts, Spikes, and Continua Observations in the 100-4200 MHz Band

1994 ◽  
Vol 144 ◽  
pp. 285-287
Author(s):  
K. Jiřička ◽  
M. Karlický ◽  
O. Kepka ◽  
A. Tlamicha
Keyword(s):  
Time Resolution ◽  
Solar Radio ◽  
High Time ◽  
High Time Resolution ◽  
Observational System ◽  
Fast Drift

AbstractNew Ondřejov solar radio observational system consisting of a high-time resolution 3000 MHz receiver and of a 100-4200 MHz radiospectrograph is described and some results of observation of fast drift bursts, spikes, and continua are presented.

scholarly journals An Acousto-optical Image Processor and Its Application to a 160 MHz Interferometer

1979 ◽  
Vol 49 ◽  
pp. 165-172
Author(s):  
Keizo Kai ◽  
Takeo Kosugi
Keyword(s):  
Solar Radio ◽  
Signal To Noise Ratio ◽  
The Sun ◽  
Optical Processing ◽  
Signal To Noise ◽  
Simulation Experiments ◽  
Radio Observatory ◽  
Image Processor ◽  
Radio Emissions ◽  
Solar Observations

AbstractRadio emissions from the Sun are characterized by extremely rapid time variation. Although they are relatively strong, the signal to noise ratio becomes critical when we observe them with high resolution in space and time. To improve the S-N ratio, we have investigated the feasibility of an acousto-optical processing of interferometer images and applied it to the 160 MHz interferometer of the Nobeyama Solar Radio Observatory. We present here results of simulation experiments and preliminary solar observations with the new image processor.

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