Seasonal variation and solar activity dependence of two distinct types of 150-km echoes from JULIA observations

Gabrielle Guttormsen, Boston University, Boston, MA, United States, Meers M Oppenheim, Boston University, Center for Space Physics, Boston, MA, United States and Marco A Milla, University of Illinois at Urbana Champaign, Electrical and Computer Engineering, Urbana, IL, United States
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