On the low-latitude boundary of the winter anomaly of ionospheric absorption

Lauter, E. A.; Schäning, B.

doi:10.1016/0021-9169(70)90077-2

Cited by 21 publications

(2 citation statements)

References 4 publications

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“…Under certain conditions which for the stationary wave case are approximated by the Charney-Drazin criterion (Charney and Drazin, 1961): not too strong eastward background winds and long horizontal wavelengths) planetary waves vertically penetrate to the stratosphere and also up to the mesosphere where they can affect the ionosphere (Lastovicka et al, 1994;Borries et al, 2007;Brown and John, 1979;Haldoupis and Pancheva, 2002;Haldoupis et al, 2004). During the Northern Hemisphere winter months planetary wavenumber one is large and variable in the mesosphere and we found further hints that the D-layer winter anomaly (unusually strong absorption of radio waves in the ionosphere, not related to solar activity (Appleton and Piggott, 1954;Lauter and Schaening, 1970;Lauter et al, 1984;Taubenheim, 1971), is correlated to planetary wave activity.…”

Section: Introductionsupporting

confidence: 52%

Remote sensing planetary waves in the midlatitude mesosphere using low frequency transmitter signals

Schmitter¹

2011

Ann. Geophys.

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Abstract. Very low and low radio frequency (VLF/LF) propagation responds sensitively to the electron density distribution in the lower ionosphere (upper mesosphere). Whereas propagation paths crossing subpolar and polar regions are frequently affected by forcing from above by particle precipitations, mid-and lowlatitude paths let forcing from below be more prominent. Our observations (2009)(2010)(2011) show, that the low frequency propagation conditions along the midlatitude path from Sicily to Germany (52 • N 8 • E) using the NSY 45.9 kHz transmitter (37 • N 14 • E) prove to be a good proxy of mesosphere planetary wave activity along the propagation path. High absorption events with VLF/LF propagation correlate to the well known winter time D-layer anomaly observed with high frequency (HF) radio waves. VLF/LF propagation calculations are presented which show that the radio signal amplitude variations can be modeled by planetary wave modulated collison frequency and electron density profiles. The other way around wave pressure amplitudes can be inferred from the VLF/LF data.

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Section: Introductionsupporting

confidence: 52%

Remote sensing planetary waves in the midlatitude mesosphere using low frequency transmitter signals

Schmitter¹

2011

Ann. Geophys.

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“…Despite the fact that there is a paucity of study on Turkish management practices, observers and researchers tend to agree on certain aspects of Turkish management practices (Lauter, 1970).…”

Section: Successor and Family Member/stakeholder Relationshipsmentioning

confidence: 99%

Succession Planning and Family-Owned Business: An Assessment of Impact on Selected Family-Owned Business

AKINDELE¹,

Olaniyi²,

OLUSESI³

2022

LJERHRM

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This paper is succession planning and family–owned business:an assessment of impact on selected family-owned businesses. Furthermore, the study assesses the relationship between mentoring and sustainability of selected family-owned business in Ibadan. It also evaluates the differences between roles modeling on survival of family-owned business in Ibadan, and finally to find out the differences between training and development on growth of family-owned business in Ibadan. The study employed survey research design. The population for this study consists of all staff of selected family-owned business in Ibadan. The total number of 140family business owners/founders was calculated using Taro Yamane’s formula, thus a target population of 215family business owners/founders. The findings of the research showed that mentoring leads to increase in sustainability of selected family-owned business in Ibadan (β = 0.140 P = ≤0.05). Also, the value of coefficient (β = 0.868 P = ≤0.05) is significant and positive, showing that direct and indirect family leads to survival of family-owned business in Ibadan, Oyo State, Nigeria. Finally Training and development were significantly and positively related to growth of family-owned business [r (140) = .636**, p<0.01]. Thus, it was found out that training and development has a positive and statistically significant influence on growth of family-owned business. The study concluded that family-owned wealth management and financial planning businesses have a compelling need for a succession plan. It was recommended that Managers and leaders might use the findings of this study to recognize the importance of succession planning and document future succession plans in a more organized approach and by developing a road map to clarify positions.

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Wave motions in the atmosphere and related ionospheric phenomena

Murata

1974

Space Sci Rev

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We review important studies in the field of stratosphere-ionosphere coupling, including recent studies of wave motions of planetary waves, atmospheric tides and internal gravity waves in the atmosphere. The interrelation between stratospheric sudden warmings and winter anomaly of radio absorption, a dynamical model of stratospheric sudden warmings and some production mechanisms of intensified electron density in the D region are discussed. Other topics presented are atmospheric tides in the lower thermosphere including dynamo action, and internal gravity waves, by which we intend to explain travelling ionospheric disturbances in the F2 region and sporadic E layer at midlatitude (wave-enhanced sporadic E). Thermospheric winds are also reviewed and wind effects on the Fz layer are discussed. For each atmospheric event systematic observations of suitable physical quantities with proper time and spatial intervals are desirable.

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On the low-latitude boundary of the winter anomaly of ionospheric absorption

Cited by 21 publications

References 4 publications

Remote sensing planetary waves in the midlatitude mesosphere using low frequency transmitter signals

Remote sensing planetary waves in the midlatitude mesosphere using low frequency transmitter signals

Succession Planning and Family-Owned Business: An Assessment of Impact on Selected Family-Owned Business

Wave motions in the atmosphere and related ionospheric phenomena

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