Publisher Correction: Mapping the ionosphere with millions of phones

Affiliations

• ¹ Google Research, Mountain View, CA, USA.
• ² Aerospace Engineering Sciences Department, University of Colorado Boulder, Boulder, CO, USA.
• ³ School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA.
• ⁴ Google Platforms and Devices, Mountain View, CA, USA.
• ⁵ Google Research, Mountain View, CA, USA. [email protected].