http://nopr.niscpr.res.in/handle/123456789/17297 2026-10-11T22:17:10Z http://nopr.niscpr.res.in/handle/123456789/17342 Title: Strong diffusion of protons by Pc1 waves Authors: Singh, D P; Singh, U P Abstract: <span style="font-size:14.0pt;line-height: 115%;font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" color:black;mso-ansi-language:en-in;mso-fareast-language:en-in;mso-bidi-language:="" hi"="" lang="EN-IN">Diffusion of energetic protons by <i>L </i>mode electromagnetic ion cyclotron (EMIC) waves in the Pc1 range is studied. It is found that <i>L=</i>4<i> </i>(which is strong diffusion region for energetic electrons by VLF whistler mode waves)<i> </i>is a weak diffusion region and <i>L </i><span style="font-size:14.0pt;line-height:115%;font-family:" times="" new="" roman";="" mso-fareast-font-family:hiddenhorzocr;color:black;mso-ansi-language:en-in;="" mso-fareast-language:en-in;mso-bidi-language:hi"="" lang="EN-IN">≥ <span style="font-size:14.0pt;line-height:115%;font-family:" times="" new="" roman";="" mso-fareast-font-family:"times="" roman";color:black;mso-ansi-language:en-in;="" mso-fareast-language:en-in;mso-bidi-language:hi"="" lang="EN-IN">5.5 is a strong diffusion region for energetic protons. Different criteria to measure diffusion strength support this result. The result is in agreement with various theoretical and <i>in</i> <i>situ </i>observations.</span></span></span> Page(s): 148-152 1999-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/17341 Title: Role of oblique whistler-mode waves in energetic electron precipitation at the lower edge of inner radiation belt Authors: Prakash, Ram; Agrawal, Bal Mukund Abstract: <span style="font-size:14.0pt;line-height: 115%;font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" color:black;mso-ansi-language:en-in;mso-fareast-language:en-in;mso-bidi-language:="" hi"="" lang="EN-IN">An attempt has been made to study the precipitation of energetic (keV and MeV) electrons at the lower edge of inner radiation belt in terms of their quasi-linear gyro-resonant interaction with oblique whistler-mode waves. The calculated average pitch angle scattering (~10^-1 degree) and lifetimes (~ days and hours only) indicate a significant electron precipitation by these waves into the lower latitude atmosphere. The low calculated lifetimes of energetic electrons and sufficiently high calculated flux of precipitated electrons caused due to gyro-resonant interaction involving oblique whistler-mode waves show that these non-ducted waves are likely to be an effective electron precipitator at the lower edge of inner radiation belt.</span> Page(s): 141-147 1999-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/17340 Title: A bit synchronizer for telecommunication with a balloon-borne experiment Authors: Chalke, S A; Costa, S L D; Ghosh, S K; Patkar, D M Abstract: <span style="font-size:14.0pt;line-height: 115%;font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" color:black;mso-ansi-language:en-in;mso-fareast-language:en-in;mso-bidi-language:="" hi"="" lang="EN-IN">The bit synchronizer forms <span style="font-size:14.0pt; line-height:115%;font-family:" times="" new="" roman";mso-fareast-font-family:hiddenhorzocr;="" color:black;mso-ansi-language:en-in;mso-fareast-language:en-in;mso-bidi-language:="" hi"="" lang="EN-IN">an important <span style="font-size:14.0pt;line-height: 115%;font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" color:black;mso-ansi-language:en-in;mso-fareast-language:en-in;mso-bidi-language:="" hi"="" lang="EN-IN">component of a telemetry ground station for receiving on-line information from a s<span style="font-size:14.0pt;line-height:115%; font-family:" times="" new="" roman";mso-fareast-font-family:hiddenhorzocr;color:black;="" mso-ansi-language:en-in;mso-fareast-language:en-in;mso-bidi-language:hi"="" lang="EN-IN">pace borne <span style="font-size:14.0pt;line-height:115%; font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" color:black;mso-ansi-language:en-in;mso-fareast-language:en-in;mso-bidi-language:="" hi"="" lang="EN-IN">experiment. A new bit synchronizer for a pulse code modulation (PCM) telemetry system which was developed use with the TIFR 100 cm balloon-borne far-infrared telescope payload has been described. This system performed <span style="font-size:14.0pt;line-height:115%;font-family:" times="" new="" roman";="" mso-fareast-font-family:hiddenhorzocr;color:black;mso-ansi-language:en-in;="" mso-fareast-language:en-in;mso-bidi-language:hi"="" lang="EN-IN">satisfactorily<span style="font-size:14.0pt;line-height:115%;font-family:" times="" new="" roman";="" mso-fareast-font-family:"times="" roman";color:black;mso-ansi-language:en-in;="" mso-fareast-language:en-in;mso-bidi-language:hi"="" lang="EN-IN"> during recent balloon flight experiments.</span></span></span></span></span></span></span> Page(s): 134-140 1999-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/17339 Title: Modelling of tropospheric ozone in the equatorial region Authors: Jain, Meena; Kundu, Namita Abstract: The averaged ozone profile at the Indian station Trivandrum (8° N) is analyzed to get its characteristics in the tropical region. The vertical profile derived from rocket and balloonsonde data shows low concentration of ozone in the 8-12 km <span style="font-size:14.0pt;line-height:115%;font-family:" times="" new="" roman";="" mso-fareast-font-family:"times="" roman";color:black;mso-ansi-language:en-in;="" mso-fareast-language:en-in;mso-bidi-language:hi"="" lang="EN-IN">altitude range. A photochemical-diffusive model has been developed to explain this phenomenon. The calculated profile obtained from the model does not give the knee in the above mentioned height range, but the shape produced by the model tallies with the observed profiles.</span> Page(s): 127-133 1999-06-01T00:00:00Z