Accession Number : AD0634841

Title :   IONOSPHERIC VARIATIONS OVER WASHINGTON, D. C., BEFORE AND AFTER GEOMAGNETIC STORMS.

Descriptive Note : Research and development rept., Jun 63-Jan 66,

Corporate Author : NAVY ELECTRONICS LAB SAN DIEGO CALIF

Personal Author(s) : NOONKESTER, V. R.

Report Date : 25 MAR 1966

Pagination or Media Count : 20

Abstract : Midday averages of the critical frequencies of ordinary waves of the F2- and E-regions, F sub o F2 and f sub o E, and the minimum virtual height of the E-region, hE, were computed from hourly values to represent the E and F regions at Washington, D. C. Long-term variations were removed by mathematical filtering. Superposed epoch analysis of the filtered averages revealed that: (1) h and fE are not related to magnetic storms, (2) except during sunspot minimum, fF is large 1 or 2 days before magnetic storms and small up to 3 days afterwards, (3) during sunspot minimum fF is not related to magnetic storms. (Author)

Descriptors :   (*IONOSPHERIC DISTURBANCES, *MAGNETIC STORMS), SUNSPOTS, METEOROLOGICAL PHENOMENA, GEOMAGNETISM, ATMOSPHERIC SOUNDING, DISTRICT OF COLUMBIA

Subject Categories : Atmospheric Physics
      Geomagnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE