Ricardo Yvan de La Cruz Cueva, Jean‐Pierre Raulin, Jorge Enrique Samanes Cardenas,
Perturbations in the amplitude (or phase) of radio signals are caused by irregularities in the ionospheric electron density. Ionospheric structures can disrupt the propagation of radio waves, and are commonly observed, for instance, by ionospheric vertical radio sounders (ionosondes). For historical reasons, the signatures of ionospheric irregularities in different types observations (optical, radio, in-stu ) are referred to as equatorial spread F (ESF). Previous studies show that the occurrence rate ...
Tópico(s): Ionosphere and magnetosphere dynamics
2021 - Brazilian Journal of Development | Brazilian Journal of Development
... of visits to São Paulo and the Azores (Ilha Terceira). A few months later, a letter (3 ... The end of November found Boxer in Lisbon; Christmas of 1972 was spent in England. In January ... his struggle “against those great gluttons, time and Christmas” (letter of 2 November 1976). He was trying ... or self-promotion. A greeting card (actually a Christmas card produced by the United Service and Royal ... Boxer had crossed out the “Best wishes for Christmas and Happy New Year” part!) carried the illustration ... the holiday season were reflected in a pre Christmas letter in 1974 that ended: “Compliments of the ...
Tópico(s): Philippine History and Culture
2000 - Duke University Press | Hispanic American Historical Review