FIGURE CAPTION: (A) Schematic representation of rocket trajectory and various ray paths to geostationary satellites (SIRIO, ATS-3 and ATS-5). (B) Sample total electron content (TEC) measurements made along slant ray paths to the SIRIO satellite. (C) Ionospheric TEC data from six stations displayed via iso-level contours on a time/latitude grid. The development of the hole is marked by the rapid transition of the contours from basically vertical lines (normal nightime dacay) to essentially horizontal lines (showing a trough-like minimum). The TEC data are normalized to 57.6 units (101 el/m2) at 05:00 U.T., with subsequent contours spaced at -3.2 units. The launch occurred at 05:28 U.T.
RkJQdWJsaXNoZXIy MTU5NjU0Mg==