42 research outputs found
Type II and IV radio bursts in the active period October-November 2003
In this report we present the Type II and IV radio bursts observed and
analyzed by the radio spectrograph ARTEMIS IV1, in the 650-20MHz frequency
range, during the active period October-November 2003. These bursts exhibit
very rich fine structures such fibers, pulsations and zebra patterns which is
associated with certain characteristics of the associated solar flares and
CMEs.Comment: Recent Advances in Astronomy and Astrophysics: 7th International
Conference of the Hellenic Astronomical Society. AIP Conference Proceedings,
Volume 848, pp. 199-206 (2006
Ten Years of the Solar Radiospectrograph ARTEMIS-IV
The Solar Radiospectrograph of the University of Athens (ARTEMIS-IV) is in
operation at the Thermopylae Satellite Communication Station since 1996. The
observations extend from the base of the Solar Corona (650 MHz) to about 2
Solar Radii (20 MHz) with time resolution 1/10-1/100 sec. The instruments
recordings, being in the form of dynamic spectra, measure radio flux as a
function of height in the corona; our observations are combined with spatial
data from the Nancay Radioheliograph whenever the need for 3D positional
information arises. The ARTEMIS-IV contribution in the study of solar radio
bursts is two fold- Firstly, in investigating new spectral characteristics
since its high sampling rate facilitates the study of fine structures in radio
events. On the other hand it is used in studying the association of solar
bursts with interplanetary phenomena because of its extended frequency range
which is, furthermore, complementary to the range of the WIND/WAVES receivers
and the observations may be readily combined. This reports serves as a brief
account of this operation. Joint observations with STEREO/WAVES and LOFAR low
frequency receivers are envisaged in the future
Radio Bursts in the Active Period January 2005
We present complex radio bursts recorded by the radiospectrograph ARTEMIS-IV
in the active period of January 2005. The wide spectral coverage of this
recorder, in the 650-20 MHz range, permits an analysis of the radio bursts from
the base of the Solar Corona to 2 Solar Radii; it thus facilitates the
association of radio activity with other types of solar energetic phenomena.
Furthermore the ARTEMIS-IV1, high time resolution (1/100 sec) in the 450-270
MHz range, makes possible the detection and analysis of the fine structure
which most of the major radio events exhibit.Comment: Recent Advances in Astronomy and Astrophysics: 7th International
Conference of the Hellenic Astronomical Society. AIP Conference Proceedings,
Volume 848, pp. 213-217 (2006
Solar flares with and without SOHO/LASCO coronal mass ejections and type II shocks
We analyse of a set of radio rich (accompanied by type IV or II bursts) solar
flares and their association with SOHO/LASCO Coronal Mass Ejections in the
period 1998 2000. The intensity, impulsiveness and energetics of these events
are investigated. We find that, on the average, flares associated both with
type IIs and CMEs are more impulsive and more energetic than flares associated
with type IIs only (without CME reported), as well as flares accompanied by
type IV continua but not type II shocks. From the last two classes, flares with
type II bursts (without CMEs reported) are the shortest in duration and the
most impulsive.Comment: Advances in Space Research, Volume 38, Issue 5, p. 1007-101
smart sustainable islands vs smart sustainable cities
This paper has several aims: a) the presentation of a critical analysis of the terms "smart sustainable cities" and "smart sustainable islands" b) the presentation of a number of principles towards to the development methodological framework of concepts and actions, in a form of a manual and actions guide, for the smartification and sustainability of islands. This kind of master plan is divided in thematic sectors (key factors) which concern the insular municipalities c) the creation of an island's smartification and sustainability index d) the first steps towards the creation of a portal for the presentation of our smartification actions manual, together with relative resources, smart applications examples, and, in the near future the first results of our index application in a number of Greek islands and e) the presentation of some proposals of possible actions towards their sustainable development and smartification for the municipalities - islands of Paros and Antiparos in Greece, as case studies
The improved ARTEMIS IV multichannel solar radio spectrograph of the University of Athens
We present the improved solar radio spectrograph of the University of Athens
operating at the Thermopylae Satellite Telecommunication Station. Observations
now cover the frequency range from 20 to 650 MHz. The spectrograph has a
7-meter moving parabola fed by a log-periodic antenna for 100 650 MHz and a
stationary inverted V fat dipole antenna for the 20 100 MHz range. Two
receivers are operating in parallel, one swept frequency for the whole range
(10 spectrums/sec, 630 channels/spectrum) and one acousto-optical receiver for
the range 270 to 450 MHz (100 spectrums/sec, 128 channels/spectrum). The data
acquisition system consists of two PCs (equipped with 12 bit, 225 ksamples/sec
ADC, one for each receiver). Sensitivity is about 3 SFU and 30 SFU in the 20
100 MHz and 100 650 MHz range respectively. The daily operation is fully
automated: receiving universal time from a GPS, pointing the antenna to the
sun, system calibration, starting and stopping the observations at preset
times, data acquisition, and archiving on DVD. We can also control the whole
system through modem or Internet. The instrument can be used either by itself
or in conjunction with other instruments to study the onset and evolution of
solar radio bursts and associated interplanetary phenomena.Comment: Experimental Astronomy, Volume 21, Issue 1, pp.41-5
Type II Radio Emission and Solar Particle Observations
The 28 October 2003 flare gave us the unique opportunity to compare the
acceleration time of high-energy protons with the escaping time of those
particles which have been measured onboard spacecraft and by neutron monitors
network as GLE event. High-energy emission time scale and shock wave height and
velocity time dependencies were also studied.Comment: International Journal of Modern Physics A, Volume 20, Issue 29, pp.
6705-6707 (2005
Alcohol use and abuse in training conscripts of the Hellenic navy
OBJECTIVES: Alcohol abuse and addiction are big current problems of the developed world having multivariate causality and multiple effects. Alcohol abuse in young people is a matter of central importance due to its wide range long lasting effects, especially so in Greece where the problem has only recently started growing. The Hellenic Navy is interested in the complications of alcohol abuse in training conscripts. Because young conscripts will be placed in demanding positions, but also because in Greece the military service is obligatory and represents an important period for the socialization of young men. METHODS: In the present study, levels of alcohol use and abuse were measured in a sample of 650 male training conscripts of the Hellenic Navy. The tools used are: (a) two questionnaires measuring frequency and quantity of alcohol consumption and psychosocial variables, (b) the CAGE test, which is a questionnaire measuring hidden alcoholism. RESULTS: 38,1% conscripts were characterized problematic drinkers according the adolescents criteria. Additional psychological complications were related to alcohol use. Using the stricter criterion for adults (plus psychological complications) 8.9% were found to be problematic drinkers. The use of CAGE questionnaire which is measuring hidden alcoholism, identified 16% of the total sample as hidden alcoholics. DISCUSSION: The findings regarding unregular levels of alcohol use and abuse are presented as well as their relation to psychosocial complications and to demographic characteristics. The results are discussed in the light of Creek and international bibliography
Radio Observations of the January 20, 2005 X-Class Event
We present a multi-frequency and multi-instrument study of the 20 January
2005 event. We focus mainly on the complex radio signatures and their
association with the active phenomena taking place: flares, CMEs, particle
acceleration and magnetic restructuring. As a variety of energetic particle
accelerators and sources of radio bursts are present, in the flare-ejecta
combination, we investigate their relative importance in the progress of this
event. The dynamic spectra of {Artemis-IV-Wind/Waves-Hiras with 2000 MHz-20 kHz
frequency coverage, were used to track the evolution of the event from the low
corona to the interplanetary space; these were supplemented with SXR, HXR and
gamma-ray recordings. The observations were compared with the expected radio
signatures and energetic-particle populations envisaged by the {Standard
Flare--CME model and the reconnection outflow termination shock model. A proper
combination of these mechanisms seems to provide an adequate model for the
interpretation of the observational data.Comment: Accepted for publication in Solar Physic