The document "Understanding Solar Terrestrial Reports" has been completed and is ready for distribution. It is an extensive document covering a great many topics. Due to the enormous number of requests that have been received for this document, it was decided that the document should first be distributed over the nets before being sent out directly to those individuals who requested it. This will significantly reduce the amount of time and work involved in distributing the document to those who requested it. To all those who requested the document, thanks for being patient. It is hoped the document will prove useful and informative. The document has been divided into two independent parts. Due to the size of the document, each part has been divided into several "sections." All of the sections have been uuencoded. To obtain the complete document (both parts), collect all of the sections which appear over the networks for BOTH parts and follow the instructions contained in each message. After uudecoding both parts, you should have two files "part1.doc" and "part2.doc" which can then be printed out separately. This document is printer-ready. It should be globally compatible with all printer types. If any of you have problems printing out the document or do not obtain all of the sections within a couple of weeks, notify "std_oler@hg.uleth.ca" of your problems so they can be worked out. The table of contents for both parts of the document have been extracted and reprinted below: PART I: MORPHOLOGICAL ANALYSIS OF PHENOMENA Introduction .................................................... 1 Characteristics of the Sun ...................................... 2 Sunspots and the Solar Flux ..................................... 3 The Sunspot Cycle ............................................... 6 The 22 Year Solar Cycle ......................................... 6 The Solar Atmosphere ............................................ 7 The Photosphere ................................................. 7 The Chromosphere and Spicules ................................... 8 The Corona and Coronal Holes .................................... 9 Forms of Solar Activity ......................................... 10 Plages and Faculae .............................................. 11 Prominences and Filaments ....................................... 12 Solar Flares .................................................... 14 Polar Cap Absorption Events ..................................... 16 Significance of Sweep Frequency Events .......................... 17 The Slowly Varying Component .................................... 17 Type I Bursts and Radio Noise Storms ............................ 18 Type III Radio Bursts ........................................... 18 Type V Radio Burst Emissions .................................... 19 Type II Radio Bursts ............................................ 19 Continuum Type IV Radio Bursts .................................. 20 The Earth's Magnetic Field ...................................... 21 Geomagnetic Substorms ........................................... 22 Geomagnetic Storms .............................................. 23 Ionospheric Effects of Geomagnetic Storms ....................... 24 Radio Signal Propagation ........................................ 25 Propagation of VLF Signals ...................................... 26 HF Signal Propagation ........................................... 26 Long-Distance VHF Signal Propagation ............................ 29 Characteristics of Auroral Activity ............................. 31 Auroral Relationship with Geomagnetic Activity .................. 31 Significance of Aurora's to Astronomers ......................... 33 Auroral Classifications ......................................... 33 The Impacts of Geomagnetic Storms and Solar Activity ............ 35 Magnetic Storm Induction ........................................ 36 Atmospheric Circulation Modifications ........................... 38 Atmospheric Pressure Responses to Solar Flares .................. 38 Atmospheric Electrical Enhancements following Major Flares ...... 40 Geomagnetic Effects on Atmospheric Pressure ..................... 42 Concluding Remarks .............................................. 44 PART II: INTERPRETING THE REPORTS Introduction .................................................... 1 The Solar Terrestrial Forecast and Review ....................... 2 Summary of Solar Terrestrial Activity ........................... 2 Short Term Solar Terrestrial Forecast ........................... 5 Solar Region Summary ............................................ 6 Geomagnetic Activity Summary .................................... 8 10-Day Geomagnetic Activity Forecast ............................ 9 Graphical Analysis of Solar Activity ............................ 10 20-Day Solar Activity Forecast .................................. 10 HF Radio Signal Propagation Predictions ......................... 11 VHF Propagation Prediction Charts ............................... 14 Auroral Activity Predictions .................................... 15 Monthly Solar Terrestrial Review ................................ 16 Geomagnetic Storm Alert ......................................... 16 Concluding Remarks .............................................. 17 Comments and/or questions regarding this document are welcomed and may be directed to "std_oler@hg.uleth.ca".