Unul dintre cei doi sateliţi ai misiunii Radiation Belt Storm Probe (RBSP), lansaţi anul acesta la data de 30 august, a captat undele radio emise de magnetosfera terestră la data de 5 septembrie, anul curent. Fenomenul acustic este cunoscut sub denumirea de „corul Pământului”.
Craig Kletzing, de la Universitatea Iowa, conduce echipa de cercetători care supraveghează ansamblul complex de instrumente ştiinţifice de la bordul sateliţilor RBSP. El a explicat că sunetele sunt emise de particulele încărcate energetic din straturile superioare ale magnetosferei Pământului, înainte ca acestea să fie prinse în mişcarea generată de câmpurile circulare de radiaţii din jurul planetei.
Cei doi sateliţi RBSP se rotesc în jurul Pământului pe orbite eliptice, la altitudini ce variază între 600 şi 32.000 km.
Scopul acestei misiuni este studierea centurilor Van Allen – curenţi de particule încărcate electric, aduse de vânturile solare până în preajma Terrei şi care sunt prinse în câmpul magnetic terestru.
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