Solar wind dependence of the Pc1 wave activity

Guglielmi, A. V.; Kangas, J.; Kultima, J.; Potapov, A. S.

doi:10.1016/j.asr.2003.11.024

Cited by 6 publications

(4 citation statements)

References 10 publications

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“…9b). However, our results are consistent with Guglielmi et al (2005), who also reported that slow solar wind creates a favorable condition for pearl-type Pc1 events observed at the Sodankylä observatory (L ∼ 5.1). It seems that fast solar wind velocity events cannot be a prime driver of Pc1.…”

Section: Dependence On Magnetic Activity and Solar Wind Velocitysupporting

confidence: 93%

Global characteristics of Pc1 magnetic pulsations during solar cycle 23 deduced from CHAMP data

2013

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We present a global climatology of Pc1 pulsations as observed by the CHAMP satellite from 2000 to 2010. The Pc1 center frequency and bandwidth are about 1 and 0.5 Hz, respectively. The ellipticity is mostly linear with the major axis almost aligned with the magnetic zonal direction. The diurnal variation of Pc1 occurrences shows a primary maximum early in the morning and a secondary maximum during pre-midnight hours. The annual variations of the occurrence rates exhibit a clear preference for local summer. The solar cycle dependence of the occurrence rate reveals a maximum at the declining phase (2004–2005). Neither magnetic activity nor solar wind velocity controls the Pc1 occurrence rate significantly. Pc1 occurrence rate peaks at subauroral latitudes, but the steep cutoff towards higher latitudes is due to auroral field-aligned currents masking the Pc1 pulsations. The center frequency of Pc1 pulsations does not show a clear dependence on latitude. The global distribution of Pc1 exhibits highest occurrence rates near the longitude sector of the South Atlantic Anomaly. Pc1 events at auroral latitudes, although they are rarely detected, show a clear occurrence peak around local noon. A majority of the auroral Pc1 events are observed during solar minimum years

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Section: Dependence On Magnetic Activity and Solar Wind Velocitysupporting

confidence: 93%

Global characteristics of Pc1 magnetic pulsations during solar cycle 23 deduced from CHAMP data

2013

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“…In the following, we focus our attention to the relation p(N) which is mysterious in some respect (see below). Guglielmi et al (2005Guglielmi et al ( , 2006 confirmed the dependence of p versus N in a statistical study of the solar wind influences on the Pc1 wave activity by using the long-term observations in a wide range of geomagnetic latitudes. To present the data uniformly and to facilitate the computer analysis, the electronic catalogs of Pc1 records were specially created for this study.…”

Section: Solar Wind Dependence Of the Pc1 Wave Activitymentioning

confidence: 58%

“…In this case the errors for p do not exceed 0.05 in each subinterval. See Guglielmi et al (2005) for more details concerning the data processing and evaluation. dynamic pressure, largely controls the overall compression of the geomagnetic field.…”

Section: Solar Wind Dependence Of the Pc1 Wave Activitymentioning

confidence: 99%

Pc1 waves in the system of solar–terrestrial relations: New reflections

Guglielmi

Kangas

2007

Journal of Atmospheric and Solar-Terrestrial Physics

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“…The solar activity influence on EMIC waves might be linked through the variations in interplanetary solar wind parameters like density, velocity, and dynamic pressure. A study by Guglielmi et al (2005) indicates that the occurrence of Pc1 waves at Sodankyla, Finland ( L = 5.1 ) is controlled by the higher solar wind density and low values of solar wind velocity. Also, the role of solar wind dynamic pressure in exciting EMIC waves has been established through satellite observations (Usanova et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Occurrence characteristics of electromagnetic ion cyclotron waves at sub-auroral Antarctic station Maitri during solar cycle 24

Upadhyay

Kakad

et al. 2020

Earth Planets Space

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We present a statistical study of electromagnetic ion cyclotron (EMIC) waves observed at Antarctic station (geographic 70.7 • S , 11.8 • E , L = 5) on quiet and disturbed days during 2011-2017. The data span a fairly good period of both ascending and descending phases of the solar cycle 24, which has witnessed extremely low activity. We noted EMIC wave occurrence by examining wave power in different frequency ranges in the spectrogram. EMIC wave occurrence during ascending and descending phases of solar cycle 24, its local time, seasonal dependence and durations have been examined. There are total 2367 days for which data are available. Overall, EMIC waves are observed for 3166.5 h (≈ 5.57% of total duration) which has contributions from 1263 days. We find a significantly higher EMIC wave occurrence during the descending phase (≈ 6.83%) as compared to the ascending phase (≈ 4.08%) of the solar cycle, which implies nearly a twofold increase in EMIC wave occurrence. This feature is attributed to the higher solar wind dynamic pressure during descending phase of solar activity. There is no evident difference in the percentage occurrence of EMIC waves on magnetically disturbed and quiet days. On ground, EMIC waves show marginally higher occurrence during winter as compared to summer. This seasonal tendency is attributed to lower electron densities and conductivities in the ionosphere, which can affect the propagation of EMIC waves through ionospheric ducts. In local time, the probability distribution function of EMIC wave occurrence shows enhancement during 11.7-20.7 LT (i.e., afternoon-dusk sector). Daily durations of EMIC waves are in the range of 5-1015 min and it is noted that the longer duration (240-1015 min) events are prevalent on quiet days and are mostly seen during the descending phase of solar cycle.

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Solar wind dependence of the Pc1 wave activity

Cited by 6 publications

References 10 publications

Global characteristics of Pc1 magnetic pulsations during solar cycle 23 deduced from CHAMP data

Global characteristics of Pc1 magnetic pulsations during solar cycle 23 deduced from CHAMP data

Pc1 waves in the system of solar–terrestrial relations: New reflections

Occurrence characteristics of electromagnetic ion cyclotron waves at sub-auroral Antarctic station Maitri during solar cycle 24

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