Franco Manini
Career Stage
Student (postgraduate)
Poster Abstract
It is well known that the Sun is a fantastic scenario where a plethora of phenomena develops frequently. Being Earth revolving around it, what happens on the Sun reverberates all over the Solar System. One of the many forms of solar activity are the Coronal Mass Ejections. These are plasma eruptions that travel through space and may reach Earth. These can alter the space environment of the planet, thus the interest in study them. In this work we have produced a catalogue regarding a radio emission which ocurrs when these CME are detected in situ by means of a spacecraft.
Plain text summary
Coronal Mass Ejections (CMEs) are one of the many forms of solar activity. These are huge plasma eruptions released in short periods of time. When they are detected in situ by means of a spacecraft, they are called Interplanetary Coronal Mass Ejections (ICMEs). These have a great relevance on the space weather conditions, given that one ICME directed towards Earth, is able to have an impact on the planet, producing geomagnetic storms, among other phenomena.
Some ICMEs, usually the fastests ones, are accompanied by a magnetohydrodynamic (MHD) shockwave, who travels in front of the CME. During propagation, this shockwave excites electrons that are on its way, and they produce radiation in the radio spectrum, which is called Type II radio frequency (TII), at the local frequency of the plasma, with wavelenghts that are metrics or kilometrics, depending on the distance to the Sun.
In this work, we produce a catalogue of this TII emissions by looking at the dynamic spectra of the WIND spacecraft, using the TNR receptor on the WAVES instrument aboard, and produce a catalogue of 105 events, some of which had not been previously detected.
We looked for events that were not previously reported in the Type II radio wave emissions catalogue from Wind/WAVES. Each event identified was added to the compiled list event, registering date and time of beggining and end of the event, so as the corresponding frequency range. This information was obtained after looking at each of the DE. Afterwards, the Type II catalogue from Wind/WAVES was examined to check whether or not, this event had been registered in that moment, in connection to the TII event detected in TNR. The final result was the selection of the 105 low frequency events.
Some ICMEs, usually the fastests ones, are accompanied by a magnetohydrodynamic (MHD) shockwave, who travels in front of the CME. During propagation, this shockwave excites electrons that are on its way, and they produce radiation in the radio spectrum, which is called Type II radio frequency (TII), at the local frequency of the plasma, with wavelenghts that are metrics or kilometrics, depending on the distance to the Sun.
In this work, we produce a catalogue of this TII emissions by looking at the dynamic spectra of the WIND spacecraft, using the TNR receptor on the WAVES instrument aboard, and produce a catalogue of 105 events, some of which had not been previously detected.
We looked for events that were not previously reported in the Type II radio wave emissions catalogue from Wind/WAVES. Each event identified was added to the compiled list event, registering date and time of beggining and end of the event, so as the corresponding frequency range. This information was obtained after looking at each of the DE. Afterwards, the Type II catalogue from Wind/WAVES was examined to check whether or not, this event had been registered in that moment, in connection to the TII event detected in TNR. The final result was the selection of the 105 low frequency events.
Poster file
Poster Title
Cataloguing type II radio waves generated by CMEs
Url
francoamaninig@gmail.com