Contrasting the responses of three different ground-based instruments to energetic electron precipitation

first_imgIn order to make best use of the opportunities provided by space missions such as the Radiation Belt Storm Probes, we determine the response of complementary subionospheric radiowave propagation measurements (VLF), riometer absorption measurements, cosmic noise absorption, and GPS-produced total electron content (vTEC) to different energetic electron precipitation (EEP). We model the relative sensitivity and responses of these instruments to idealized monoenergetic beams of precipitating electrons, and more realistic EEP spectra chosen to represent radiation belts and substorm precipitation. In the monoenergetic beam case, we find riometers are more sensitive to the same EEP event occurring during the day than during the night, while subionospheric VLF shows the opposite relationship, and the change in vTEC is independent. In general, the subionospheric VLF measurements are much more sensitive than the other two techniques for EEP over 200 keV, responding to flux magnitudes two-three orders of magnitude smaller than detectable by a riometer. Detectable TEC changes only occur for extreme monoenergetic fluxes. For the radiation belt EEP case, clearly detectable subionospheric VLF responses are produced by daytime fluxes that are ∼10 times lower than required for riometers, while nighttime fluxes can be 10,000 times lower. Riometers are likely to respond only to radiation belt fluxes during the largest EEP events and vTEC is unlikely to be significantly disturbed by radiation belt EEP. For the substorm EEP case both the riometer absorption and the subionospheric VLF technique respond significantly, as does the change in vTEC, which is likely to be detectable at ∼3–4 total electron content units.last_img read more

Ambrose Singer – Brookville

first_imgFriends may visit with the family on Friday, January 26, 2018 from 5 until 8 p.m. at Cook Rosenberger Funeral Home, 929 Main Street, Brookville. Services, officiated by Father Sean Danda will be at the funeral home on Saturday at 10:30 a.m. Burial will follow at St. Michael Cemetery. Ambrose W. Singer, of Brookville, was born on February 28, 1928 at home in Fayette County, the son of Otto J. and Alice Telker Singer. He married Carol C. Dorrel on November 5, 1949 at St. Michael Church and together they raised three children and spent over 60 wonderful years working the farm. Ambrose was a self-employed trucker and retired as a foreman from Sperry Rubber. He enjoyed raising cattle and was a member of the FC Cattleman’s Association. Ambrose was also a member of St. Michael Church. Ambrose had played basketball at Springfield High School and he maintained his love for the sport as a fan of college ball. His other hobbies included motorsports, working jigsaw puzzles and watching the Reds. On Monday, January 22, 2018 at the age of 89, Ambrose passed away at his residence. Those surviving who will cherish Ambrose’s memory include his children, Becky (Brian) Suding, Michael (Beverly) Singer, and Mark (Diane) Singer, all of Brookville; grandchildren, Jeremy Singer, Bradley Suding, Jessica Rosenberger, Blake Singer, Brooke Greenwood, Travis Singer, Bill Suding, and Matthew Singer; 21 great-grandchildren; 1 great, great-grandchild; one sister, Jean Kuehn; a brother-in-law, Raymond Dorrel, and a sister-in-law, Lucy Dorrel. Besides his parents, he was preceded in death by his wife, Carol, on March 22, 2012.center_img Memorial donations can be directed to St. Michael Church, Whitcomb United Methodist Church, the Franklin County Humane Society or to a charity of choice. To sign the online guestbook or to leave a personal condolence, please visit The staff of Cook Rosenberger Funeral Home is honored to care for the family of Ambrose Singer.last_img read more