Impact of magnetic clouds on the middle atmosphere and geomagnetic disturbances

Georgieva, K.; Kirov, B.; Atanassov, Dimitar; Boneva, Ani

doi:10.1016/j.jastp.2004.07.025

Cited by 8 publications

(8 citation statements)

References 31 publications

(29 reference statements)

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“…With this, we would be able to quantify the character of global-scale meridional wave period. A visual check on the QBO upon arrival of this left-handed MC shows that it was during easterly phase, indicating a probable disturbed stratosphere (Georgieva et al 2005) caused by this event.…”

Section: Energy Depositionmentioning

confidence: 96%

“…The complication in understanding the energy budget ranges from the hemispherical differences to the large number of external and internal processes that are able to heat the atmosphere and as well cool it, depending on the specific effective conditions present (Roble 1995). However, for several decades, one of the controversial problems in solar-terrestrial physics has been the impact of solar activities on atmospheric energetics and dynamics (Georgieva et al 2005). Several geophysical parameters are often used to gauge the impact of solar-terrestrial disturbances on the Earth's atmosphere (Zhang et al 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Despite the possible ability of compressed MCs to cause many large geomagnetic storms (Wang et al 2003), there has been little significant attention as to its effects on the MLT energy budget. It should be noted, Georgieva et al (2005) showed the probable impact of MC on the middle atmosphere based on the geo-effectiveness of the MC and phases of the quasibiennial (QBO) oscillation of equatorial stratospheric winds. The general effects were found to be strongest for south-north oriented clouds in the QBO easterly phase.…”

Section: Introductionmentioning

confidence: 99%

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A Case Study of Energy Deposition and Absorption by Magnetic Cloud Electrons and Protons over the High Latitude Stations: Effects on the Mesosphere and Lower Thermosphere

Ogunjobi¹,

Sivakumar²,

Mbatha³

2014

Terr. Atmos. Ocean. Sci.

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Several possible characteristics of magnetic clouds (MCs) have been discussed in the literature, but none appears to explain all the effects from accumulated observations. MC characteristics range from low proton temperature and plasma beta, to high magnetic field magnitude, to smooth rotation in the direction of the magnetic field thus resulting in strong geomagnetic disturbances. Varied instrumentation which is located not only in SANAE IV, Antarctica, but also at Halley, a same radial distance (L ~ 4) in the southern hemisphere and in the vicinity of a conjugate location in northern hemisphere provide an opportunity to test theories applied to high latitude heating rates on the arrival of MC. The Halley riometer is used to monitor coincidences of absorption with the arrival of MC which was observed on 8 November 2004. Using the Monte Carlo Energy Transport Model (MCETM), the corresponding altitude of electron and proton energy distribution indicates the importance of MC triggered geomagnetic storms on mesosphere dynamics.Key words: Magnetic Cloud, Precipitation, MLT region, Absorption, Energy deposition, L shell Citation: Ogunjobi, O., V. Sivakumar, and N. Mbatha, 2014: A case study of energy deposition and absorption by magnetic cloud electrons and protons over the high latitude stations: Effects on the mesosphere and lower thermosphere. Terr. Atmos. Ocean. Sci., 25,[219][220][221][222][223][224][225][226][227][228][229][230][231][232]

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Section: Energy Depositionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Case Study of Energy Deposition and Absorption by Magnetic Cloud Electrons and Protons over the High Latitude Stations: Effects on the Mesosphere and Lower Thermosphere

Ogunjobi¹,

Sivakumar²,

Mbatha³

2014

Terr. Atmos. Ocean. Sci.

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“…[32] We examined the general list of Georgieva et al [2005] and found that the larger geoeffectiveness of L events was true, but only of borderline significance. Many of those events were geomagnetically weak.…”

Section: Possible Role Of Helicitymentioning

confidence: 99%

How good is the relationship of solar and interplanetary plasma parameters with geomagnetic storms?

Kane

2005

J. Geophys. Res.

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[1] Since the work of Snyder et al. (1963), who showed a possible link between interplanetary solar wind speed V and geomagnetic index Kp, such a relationship has been examined by many workers and found to be rather loose. In the present communication this relationship is rechecked for all data during . It was noted that moderate or strong geomagnetic storms occurred only when solar wind speed V was above $350 km/s. However, above this limit, the plots of Dst versus V showed a large scatter, and any value of V could be associated with any value of Dst in a wide range of a factor of $2, or any Dst value could be associated with any value of V in a wide range of a factor of $2, indicating a poor relationship between V and Dst. The scatter could be partly because not V but VB s (product of V and the southward component B s of interplanetary field B) is the appropriate variable relevant for Dst changes. This was checked. In the plot of Dst versus VB s it was noticed that the scatter was smaller and correlation better than that in the plot of Dst versus V. Since the relationship between V and Dst is poor, an estimate of V with some antecedence, as is done in a present-day prediction scheme ) V estimated from the lateral extension speed of side halo coronal mass ejections (CMEs) and assuming V 2 proportional to Dst magnitudes) is not likely to give reliable estimates of Dst magnitudes. However, estimate of V could certainly be useful to estimate the time when the storm would hit the Earth but remembering that 15% of the halo CMEs may miss the Earth.

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“…Although the zonal wind reversal occurs in the equatorial stratosphere, the QBO effects are typical of many processes in the tropical, middle, and polar atmosphere (Baldwin et al, 2001 and references therein). They are observed in variations of the atmospheric parameters from the Earth's surface to mesosphere (Holton and Tan, 1980;Oltmans, 1982;Dunkerton et al, 1988;Dunkerton, 1989, 1998;Gray et al, 2001;Logan et al, 2003;Sitnov, 2004, and others Furthermore, it was shown (Labitzke, 1987(Labitzke, , 2005van Loon, 1988, 2000;Chanin et al, 1989;Besprozvannaya et al, 1997;Labitzke, 1999, 2000;Georgieva et al, 2005) that the solar activity effects in the Earth's atmosphere can be correctly estimated only if the atmospheric data are divided according to the QBO-phase. As shown in Labitzke (2004), the mean meridional circulation systems (Hadley and Brewer-Dobson circulation) are influenced by the solar sunspot cycle and stronger during the East phase of the QBO.…”

Section: Introductionmentioning

confidence: 99%

Influence of solar UV irradiance on the quasi-biennial oscillation of zonal winds in the equatorial stratosphere

Gabis

Трошичев

2006

Journal of Atmospheric and Solar-Terrestrial Physics

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Impact of magnetic clouds on the middle atmosphere and geomagnetic disturbances

Cited by 8 publications

References 31 publications

A Case Study of Energy Deposition and Absorption by Magnetic Cloud Electrons and Protons over the High Latitude Stations: Effects on the Mesosphere and Lower Thermosphere

A Case Study of Energy Deposition and Absorption by Magnetic Cloud Electrons and Protons over the High Latitude Stations: Effects on the Mesosphere and Lower Thermosphere

How good is the relationship of solar and interplanetary plasma parameters with geomagnetic storms?

Influence of solar UV irradiance on the quasi-biennial oscillation of zonal winds in the equatorial stratosphere

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