The spectral properties of low-latitude daytime electric fields inferred from magnetometer observations

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dc.contributor.authorNicolls, Michael J.
dc.contributor.authorKelley, Michael C.
dc.contributor.authorChau Chong Shing, Jorge Luis
dc.contributor.authorVeliz, Oscar
dc.contributor.authorAnderson, David
dc.contributor.authorAnghel, Adela
dc.date.accessioned2018-07-18T15:11:37Z
dc.date.available2018-07-18T15:11:37Z
dc.date.issued2007-03-24
dc.description.abstractFour years of magnetometer data from two locations in Peru, one at the equator and one off the equator, have been converted to electric fields and their frequency characteristics (fluctuation spectra) examined. In the frequency range from 0.1 to 30 cycles per hour, the average spectrum monotonically decreases. However, it deviates from a power law in the range 0.3–3 cycles per hour especially for high levels of activity. The integrated power above 0.15 cycles per hour is a strong function of Kp indicating that much of the fluctuations in the ionospheric equatorial field are of solar wind or magnetospheric origin. This result is in agreement with a previous power spectral study of low, middle, and high latitude fields using radars. The observed field strengths are lower than the ones observed in a previous study using balloon data at middle and high latitudes when the fields are projected to the equatorial plane. Simultaneous interplanetary electric field (IEF) data are compared to the equatorial field to determine how strong a relationship exists and to determine the amplitude and phase of their ratio as a function of frequency—an estimate of the average transfer function of the system. This function displays a bandpass-like form with a peak near 0.5 cycles per hour. This peak and evidence for a ringing of the time domain response suggests a weakly resonant system indicating some capacitance in addition to the inductance of the ring current and the resistance of the ionosphere. Case studies show that application of this function to IEF data yields good results and supports the notion that the response of the equatorial field to long-duration IEF polarities can last for many hours. Application of the function to test inputs such as pulses and triangle waves support this result. At high frequencies, we suggest that mapping of small-scale MHD turbulence is less effective than high frequency related transitions in the IEF.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationNicolls, M. J., Kelley, M. C., Chau, J. L., Veliz, O., Anderson, D., & Anghel, A. (2007). The spectral properties of low-latitude daytime electric fields inferred from magnetometer observations.==$Journal of Atmospheric and Solar-Terrestrial Physics, 69$==(10-11), 1160-1173. https://doi.org/10.1016/j.jastp.2006.08.015es_ES
dc.identifier.doihttps://doi.org/10.1016/j.jastp.2006.08.015es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalJournal of Atmospheric and Solar-Terrestrial Physicses_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/1929
dc.language.isoenges_ES
dc.publisherElsevieres_ES
dc.relation.ispartofurn:issn:1364-6826
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_ES
dc.subjectIonospherees_ES
dc.subjectElectric fieldses_ES
dc.subjectSolar windes_ES
dc.subjectMagnetometerses_ES
dc.subjectMagnetic stormses_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.01es_ES
dc.titleThe spectral properties of low-latitude daytime electric fields inferred from magnetometer observationses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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