Solar influence on ELF-VLF emission observed at conjugate stations

Journal Article · Mon Jul 01 04:00:00 EDT 1991 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/91JA01040· OSTI ID:5187707

Sato, Natsuo ^[1]; Sasahara, Toshiya; Suzuki, Hiroyuki; Maezawa, Kiyoshi ^[2]; Saemundsson, T ^[3]

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1. National Inst. of Polar Research, Tokyo (Japan)
2. Yamagata Univ. (Japan)
3. Univ. of Iceland, Reykjavik (Iceland)

Characteristics of the long-term variation of daytime (06-16 hours MLT) ELF-VLF emissions at 750 Hz and 2 kHz are examined, using 7 and 4 years of digital data obtained at a conjugate pair of stations, Syowa in Antarctica and Husafell in Iceland. The emission intensity shows obvious quasi-periodic fluctuations, with periods of 1 day (maximum around noon), {approximately} 27 days, 1 year (minimum around local winter), and {approximately} 11 years (not yet confirmed but reasonably apparent in the 7 years of data). The diurnal and seasonal variations are strongly dependent on sunlight in the topside ionosphere. The emission intensity is also affected by geomagnetic activity with quasi-periodicities of {approximately} 27 days and {approximately} 11 years. It is suggested that sunlight in the ionosphere affects the propagation of waves whereas the solar activity (geomagnetic activity) affects their generation.

• OSTI ID: 5187707
• Journal Information: Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 96:A7; ISSN 0148-0227; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

640201* -- Atmospheric Physics-- Auroral
Ionospheric
& Magetospheric Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHARGED PARTICLES
DAILY VARIATIONS
DATA ANALYSIS
EARTH ATMOSPHERE
EARTH MAGNETOSPHERE
ELECTROMAGNETIC RADIATION
EMISSION
INTERACTIONS
IONOSPHERE
PLANETARY IONOSPHERES
RADIATIONS
RADIOWAVE RADIATION
SEASONAL VARIATIONS
SOLAR ACTIVITY
SOLAR RADIATION
STELLAR RADIATION
VARIATIONS
WAVE PROPAGATION