9'43

2021.
Composition sonore - 9'43 min

 

By invitation of Valentina Costa and for Rubriche d'Aria", I propose 9'43mn of a sound journey that takes as a starting point the intimacy of the human being and brings us to the limits of the sky.
It is a connection composed of air between the inner space and the cosmic one. A vibration of particles and resonance that allows to cross the different strata of the sky: the wind of the atmosphere, the chorus of the aurora borealis and the song of the rotation of the Earth.

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    0:00 – 0:45: Nous sommes espace - Agathe Rosa, 2021 (1)
    0:46 – 1:33: Wind – Agathe Rosa, 2021
    1:34 – 2:31: Upper atmosphere: : Van Allen radiation belt (2) – Choir recorded by the Cluster 2 satellite, data downloaded July 9, 2001, Donald A. Gurnett (University of Iowa) (3)
    2:32 – 3:57: Rotation of the Earth - Original space audio recordings courtesy of NASA and Prof. Donald A. Gurnett, Carver/James A. Van Allen Prof. of Physics Department of Physics and Astronomy (University of Iowa) (4)
    5:58 -9:43: Rotation of the Earth – Original space audio recordings courtesy of NASA and cleaning of very narrow frequency bands by Agathe Rosa


    (1) Original text:
    As much as it may seem surprising, it is necessary to hide in order to re-become space.
    At the surface of being, there is a region where the intimate and the manifest dialogue. There are many imperceptible and oscillating movements, so charged with hesitation between what wiches to appears and what wiches to hide. It is the same for each space. And invisible at the face of the sky and far from the solid hiding places of the Earth, intimacy lies in the hollow hours, at the edge of matter or when our gaze hide, in the shadow of our back. To enter in resonance with a space, it is necessary to become it. (2) Van Allen radiation belt: https://en.wikipedia.org/wiki/Van_Allen_radiation_belt
    (3) The "chorus" consists of short tones of increasing frequency that sound like the chorus of birds singing at dawn, hence the name "choir" or "dawn choir". The chorus on Earth is generated by electrons in the Van Allen radiation belts. Once generated, chorus waves influence the movements of electrons through a process called wave-particle interaction. Wave-particle interactions disrupt the electronic trajectories of the radiation belt and cause electrons to impact in the upper atmosphere.
    (4) These radio waves can be picked up by the specially designed instrument known as the "astronomical interferometer". This device can convert radio waves into frequency in the range of human hearing (20 - 20,000 Hz). Voyager and Hawk-Eye are among the many probes that record space sounds.

    NASA Live Stream - Earth From Space: Live views from the ISS:
    https://www.youtube.com/watch?v=86YLFOog4GM
    https://space.physics.uiowa.edu/plasma-wave/space-audio/
    http://www.astrosurf.com/luxorion/menu-radioastro.htm