Long-term Spectral Peaks of EEJ amplitudes observed by MAGDAS/CPMN

Details Long-term Spectral Peaks of EEJ amplitudes observed by MAGDAS/CPMN Long-term Spectral Peaks of EEJ amplitudes observed by MAGDAS/CPMN

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa51a1548n&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA51A-1548

Physics

2400 Ionosphere (6929), 2415 Equatorial Ionosphere, 2427 Ionosphere/Atmosphere Interactions (0335), 6929 Ionospheric Physics (1240, 2400), 7900 Space Weather

Scientific paper

The ultimate goal of this study is to understand the couplings of, and independencies in, the Solar wind- Magnetosphere-Ionosphere-Atmosphere (S-M-I-A) system. For this goal, in this paper we analyze ground magnetometer data from the DAV, MUT and ANC stations. DAV (Davao, Philippines at GM lat.-1.37, GM lon.196.53). MUT (Muntinlupa, Philippines at GM lat.6.26, GM lon.192.22). ANC (Ancon, Peru at GM lat.3.05, GM lon.354.40). These are three stations of the MAGDAS/CPMN (MAGnetic Data Acquisition System/Circum- pan Pacific Magnetometer Network). The MAGDAS/CPMN network has been constructed by SERC, Kyushu University, and widely covers the world. DAV is located at the intersection of the 210 degree magnetic meridian and the magnetic equator. We examined the relationships among the EEJ (equatorial electrojet) amplitude, the F10.7 solar radiation flux and the cowling conductivity. The EEJ flows roughly between the altitudes of 90km and 130km in the ionosphere. The intensity of the EEJ increases especially around noon time between the geomagnetic latitudes of +3deg and -3deg. We newly defined "ethe EEJ amplitude"f by subtracting the H-component magnetic field at night time from the averaged H-component at daytime 10:30"'12:30LT. The F10.7 is the solar radiation flux (1 day data) measured at the Dominion Radio Astrophysical observatory, Canada [ftp://ftp.ngdc.noaa.gov/]. The cowling conductivity is estimated using the IRI model (International Reference Ionosphere 2007 [http://iri.gsfc.nasa.gov/]). We have analyzed spectral peaks of the EEJ amplitude at DAV, MUT and ANC and the F10.7 solar radiation flux during the period from Jan. 1, 1999 to Dec. 31, 2001. Long-term variations of the EEJ amplitude having the period of several months are focused, and compared those of with the F10.7 solar radiation flux. A strong spectral peak of the EEJ amplitude at semi-annual period is found to show higher harmonic structure. Other strong spectral peaks of the EEJ amplitude are also found at 32, 26.7 and 14.5 days. A strong spectral peaks of F10.7 are also found at 365, 156~137, 26.7 days. These results suggest that the common period at 26.7 days between the EEJ amplitude and F10.7 is oscillated with the solar rotation. The spectral peaks periods at semi-annual, 32 and 14.5 of the EEJ amplitude are not oscillated with the not solar radiation but must be related with the ionospheric and atmospheric dynamics.

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