The equation $\overrightarrow{\mathrm{\phi }\mathrm{\hspace{0.17em}}}(\mathrm{x},\mathrm{\hspace{0.17em}}\mathrm{t})=\overrightarrow{\mathrm{j}\mathrm{\hspace{0.17em}}}\sin \mathrm{\hspace{0.17em}}\left(\frac{2\mathrm{\pi }}{\mathrm{\lambda }}\mathrm{v}\mathrm{\hspace{0.17em}}\mathrm{t}\right)\cos \mathrm{\hspace{0.17em}}\left(\frac{2\mathrm{\pi }}{\mathrm{\lambda }}\mathrm{x}\right)$ represents

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