Riometer and HF radar signatures of polar patches

first_imgPolar patch was the name given originally to a spatially limited enhancement of the 630-nm emission observed in the dark polar cap. More recently, the term has been applied to related phenomena observed by other experimental techniques. The interrelationship between patches observed by differing methods has yet to be determined fully. In this paper the signatures of a series of polar patches observed by Halley HF radar and the South Pole broad-beam and imaging riometers are presented. Most frequently, the HF radar patch signature immediately precedes that of the riometer polar patch signature. The interpretation is that the leading edge of the electron concentration structure that forms the patch is steeper than its trailing edge. On a few occasions, HF radar polar patch signatures coincide with the trailing edge of riometer patches and sometimes are seen throughout the riometer patch. Halley digital ionosonde data are used to show that riometer patches are more common over South Pole when the maximum F region plasma concentration is considerably in excess of 5×1011 m−3, which often occurs in the afternoon plasma convection cell.last_img read more

Joe Diffie dies from COVID-19

first_imgNineties country hitmaker Joe Diffie passed away Sunday in Nashville of complications from the COVID-19 coronavirus. He was 61.It was only Friday that his family announced through his publicist that Diffie was sick. So far, they haven’t released any details or arrangements, simply asking for privacy.The much-revered traditionalist broke onto the scene in 1990, sending his debut single, “Home,” all the way to number one. His first album, A Thousand Winding Roads, boasted three more hits, including the chart-topping “If the Devil Danced (In Empty Pockets).”Diffie continued to be a country mainstay through the rest of the decade, sending songs like “Third Rock from the Sun,” “Pickup Man,” and “Bigger Than the Beatles” to the pinnacle of the country chart. His most recent top ten came with 2001’s “In Another World.”The Oklahoma native won a Grammy in 1998 for his contribution to Marty Stuart‘s “Same Old Train” Collaboration.In recent years, both Jason Aldean and Chris Young have name-checked Diffie in their songs “1994” and “Raised on Country,” respectively. An inductee of the Oklahoma Music Hall of Fame, Diffie was also a member of the Grand Ole Opry for a quarter century.last_img read more